Graham Wester Redgrave, M.D.

• Assistant Director, Eating Disorders Program
• Assistant Professor of Psychiatry and Behavioral Sciences

https://www.hopkinsmedicine.org/profiles/results/directory/profile/0014844/graham-redgrave

In schizo phrenia gastritis en ingles cheap prevacid 30mg fast delivery, the olfactory stimulus is usually interpreted as arising externally chronic gastritis stomach order cheapest prevacid and prevacid, and as being induced by someone for the purpose of upsetting the patient gastritis diet on a budget buy 15 mg prevacid with amex. The patient may go to great lengths to rid himself of the perceived odor gastritis symptoms hemorrhage purchase 30mg prevacid with amex, the usual ones being excessive washing and use of deodorants; the condition may lead to social withdrawal gastritis symptoms getting worse purchase prevacid once a day. There is reason to believe that the amygdaloid group of nuclei is the source of the hallucinations gastritis diet ������ buy discount prevacid 30 mg online, as stereotactic lesions here have reportedly ameliorated both the olfac tory hallucinations and the psychiatric disorder (see Chitanondh). Olfactory hallucinations and delusions may occur in conjunction with Alzheimer dementia, but one should also consider the possibility of a late-life depression. Eichenbaum and associates demonstrated a similar impairment of olfactory capaci ties in a patient who had undergone extensive bilateral medial temporal lobe resections. The operation was believed to have eliminated a substantial portion of the olfactory afferents to the frontal cortex and thalamus, although there was no anatomic verification of this. In patients with stereotactic or surgical amygdalotomies, Andy and coworkers noted a similar reduction in odor discrimination. Thus it appears that both portions of the higher olfactory pathways (medial temporal lobes, and medial dorsal nuclei) are necessary for the discrimination and identification of odors. Mainly they are located in the epithelium along the lateral surfaces of the circumvallate and foliate papillae and to a lesser extent on the surface of the fungiform papillae. The taste buds are round or oval structures, each composed of up to 200 vertically oriented receptor cells arranged like the staves of a barrel. The superficial portion of the bud is marked by a small opening, the taste pore or pit, which opens onto the mucosal surface. The tips of the sensory cells project through the pore as a number of filiform microvilli ("taste hairs"). Fine, unmy elinated sensory fibers penetrate the base of the taste bud and synapse directly with the sensory taste cells, which have no axons. The taste receptors are activated by chemical sub stances in solution and transmit their activity along the sensory nerves to the brainstem. There are four primary and readily tested taste sensations that have been long known: salty, sweet, bitter, and sour; recently a fifth, u mani, signifying a savory taste-the taste of glutamate, aspartate, and certain ribonucleotides-has been added. The full range of taste sensations is much broader, con sisting of combinations of these elementary gustatory sensations. Older notions of a "tongue map," which implied the existence of specific areas sub-serving one or another taste, are incorrect. Any one taste bud is capable of responding to a number of sapid substances, but it is always preferentially sensitive to one type of stimulus. A G-protein transduction system (gustducin), similar to the one for olfaction, has been found to be operative in signaling taste sensations in the tongue receptors. In the writings on this subject, this deficit is usually referred to as a disorder of olfactory dis crimination. In dealing with other sense modalities, how ever, the inability to identify and name a perceived sensa tion would be called an agnosia. To recognize this deficit requires special testing, such as matching to sample, the identification and naming of a variety of scents, and determining whether two odors are identical or different. Such an alteration of olfactory function has been shown to characterize patients with the alcoholic form of Korsakoff psychosis; this impairment is not attributable to impaired olfactory acuity or to failure of learning and memory (Mair et al). The number of taste buds, not large to begin with, is gradu ally reduced with age; also, changes occur in the taste cell membranes, with impaired function of ion channels and receptors (Mistretta). Gustatory (and olfactory) acuity diminishes with age (everything begins to taste and smell the same). According to Schiffman, taste thresholds for salt, sweeteners, and amino acids are 2 to 2. The reduction in the acu ity of taste and smell with aging may lead to a distortion of food habits. Interesting genetic polymorphisrns in the receptor for sweet substances in rats have been found to underlie differences in the proclivity to ingest sweet substances, and a similar system has been proposed in humans (Chaudhari and Kinnamon). The main pathway arises on the anterior two-thirds of the tongue; these taste fibers first run in the lingual nerve (a major branch of the mandibular-trigeminal [V] cranial nerve). Taste fibers from the extreme dorsal part of the tongue and the few that arise from taste buds on the pharynx and larynx run in the vagus nerve. The gustaton; n ucleus is situated in the rostral and lateral parts of the nucleus tractus solitarius, which receive the special afferent (taste) fibers from the facial and glossopharyngeal nerves. Possibly, some taste fibers from the tongue may also reach the brainstem via the mandibular division of the trigeminal nerve. The presence of this alternative pathway probably accounts for reported instances of unilateral taste loss that have followed sec tion of the root of the trigeminal nerve and instances in which no loss of taste has occurred with section of the chorda tympani. Neurons from the gustatory segment of the nucleus solitarius project to adjacent nuclei. One is the solitariothalarnic lemniscus to the ventroposteromedial nucleus of the thalamus. A second passes to the ventral parts of the forebrain, to parts of the hypothalamus (which probably influences autonomic function), and to other basal forebrain limbic areas in or near the uncus of the temporal lobe. Other ascending fibers lie near the medial lemniscus and are both crossed and uncrossed. Experiments in animals indicate that taste impulses from the thalamus project to the tongue-face area of the postrolandic sensory cortex. This is probably the end station of gustatory projections in humans as well, insofar as gustatory hallucinations have been produced by electrical stimulation of the parietal and/ or rolandic opercula (Hausser-Hauw and Bancaud). Penfield and Faulk evoked distinct taste sensations by stimulating the anterior insula. One use of such testing is to corroborate the existence of Bell palsy by comparing taste sensation on each side of the anterior tongue (see Chap. A stimulus that has been used as a surrogate for sour sensation is a low-voltage direct current, the electrodes of which can be accurately placed on the tongue surface. If the taste loss is bilateral, mouth washes with a dilute solution of sucrose, sodium chlo ride, citric acid, and quinine may be used. The patient indicates whether he had tasted a substance and is asked to identify it. Special types of apparatus (electrogustometers) have been devised for the measure ment of taste intensity and for determining the detection and recognition thresholds of taste and olfactory stimuli (Kramp; Henkin et al), but these are beyond the needs of the usual clinical examination. Ca u ses of Loss of Taste Apart from the loss of taste sensation that accompanies normal aging, smoking is probably the most common cause of impairment of taste sensation. Saliva acts as a solvent for chemical substances in food and for conveying them to taste receptors. Dryness of the mouth (xerostomia) from inadequate saliva, as occurs in Sjogren syndrome; hyperviscosity of saliva, as in cystic fibrosis; irradiation of head and neck; and pandysautonomia all interfere with taste. Also, in familial dysautonomia (Riley-Day syndrome), the number of circumvallate and fungiform papillae is reduced, accounting for a dimin ished ability to taste sweet and salty foods. Taste is fre quently lost over the anterior two-thirds of one side of the tongue in cases of mundane Bell palsy, as indicated above and in Chap. A permanent decrease in the acuity of taste and smell (hypogeusia and hyposmia), sometimes associated with perversions of these sensory functions (dysgeusia and dysosmia), may follow influenza-like illnesses. These abnormalities have been associated with patho logic changes in the taste buds as well as in the nasal mucous membranes. In a group of 143 patients who presented with hypogeusia and hyposmia, 87 were of this postinfluenzal type, as determined by Henkin and colleagues; the remainder developed their symptoms in association with scleroderma, acute hepatitis, viral encephalitis, myxedema, adrenal insufficiency, malig nancy, deficiency of vitamins B and A, and the admin istration of a wide variety of drugs. Also, according to Schiffman, more than 250 drugs have been implicated in the alteration of taste sensation, making it necessary to consider virtually all drugs as a cause of taste loss. Lipid-lowering drugs, antihistamines, antimicrobials, antineoplastics, bronchodilators, antidepressants, and antiepileptics are the main offenders, but little is known about the mechanisms by which drugs induce these effects. More obvious is altered taste because of nasally and orally administered inhalant drugs, including the "triptans" for migraine and a variety of antiallergy and antiasthmatic medications. Distortions of taste and loss of taste are sources of complaint in patients with certain local malignant tumors. Oropharyngeal tumors may, of course, abolish taste by invading the chorda tympani or lingual nerves and basal skull. Some patients with certain cancers remark on a reduced perception for bitter foods, and some who have been radiated for breast cancer or sublingual or oropharyngeal tumors find sour foods intolerable. The loss of taste from radiation of the oropharynx is usually recovered within a few weeks or months; the reduced turnover of taste buds caused by radiation therapy usually recovers. An interesting syndrome of idiopathic hypogeusia-in which decreased taste acuity is associated with dysgeu sia, hyposmia, and dysosmia-has been described by Henkin, Schechter and colleagues. Food has an unpleas ant taste and aroma, to the point of being revolting (caco geusia and cacosmia); the persistence of these symptoms may lead to a loss of weight, anxiety, and depression. Unilateral lesions of the medulla oblongata have not been reported to cause ageusia, perhaps because the nucleus of the tractus solitarius is usually outside the zone of infarction or because there is representation from both sides of the tongue in each nucleus. Unilateral tha lamic and parietal lobe lesions, however, have both been associated with contralateral impairment of taste sensa tion in rare cases. As indicated above, a gustatory aura occasion ally marks the beginning of a seizure originating in the frontoparietal (suprasylvian) cortex or in the uncal region. Nevertheless, gustatory sensations were reported in 30 of 71 8 cases of intractable epilepsy (Hausser-Hauw and Bancaud). During surgery, these investigators produced an aura of disagreeable taste by electrical stimulation of the parietal and frontal opercula, and also by stimulation of the hippocampus and amyg dala (uncinate seizures). In their view, the low-threshold seizure focus for taste in the temporal lobe is secondary to functional disorganization of the opercular gustatory cortex by the seizure. Gustatory hallucinations were more frequent with right-hemisphere lesions, and in half of the cases, the gustatory aura was followed by a convulsion. Zinc supplements are contained in over-the-counter and complementary medical products aimed at improv ing smell and appetite and for the treatment of incipient colds. We have had no opportunity to confirm the often cited benefits of zinc on any of these conditions, and the supporting evidence is sparse, however, the continued administration of zinc in high doses has been associated with the development of copper deficiency and a myelo neuropathy (see Chap. Burning Mouth Syndrome Another poorly defined disorder is the burning mouth syndrome, which occurs mainly in postmenopausal women and is characterized by persistent, severe intraoral pain (particularly of the tongue). We have seen what we believe to be fragmen tary forms of the syndrome in which pain and burning are isolated to the alveolar ridge or gingival mucosa. The oral mucosa appears normal and some patients may report a diminution of taste sensation. A small number of such patients prove to have diabetes, Sjogren syndrome, or vitamins B2 or B12 deficiency (causing glossitis), but in most no systemic illness or local abnormality can be found. Many such patients that we have encountered appeared to have a depressive illness, but they responded only inconsistently to administration of antidepressants. A few patients have this oral complaint as a component of a small fiber neuropathy or ganglionopathy (see Chap. Chitanondh H: Stereotaxic amygdalotomy in the treatment of olfac tory seizures and psychiatric disorders with olfactory hallucina tions. New York, Raven Press, 1991, pp Schiffm a n 55: Taste and smell losses in normal aging and disease. A, Quint C, et al: Olfactory function in patients with olfactory groove meningiomas. A large part of the cerebrum is committed to vision, including the visual control of movement and the perception of printed words, and the form and color of objects. The optic nerve, which is a adolescence, nearsightedness or myopia, and amblyopia as although a pigmentary retinopathy or a retinal, optic nerve, or suprasellar tumor may also begin at this age. In middle age, usually beginning in the fifth decade, a pro gressive loss of accommodation (presbyopia) is almost invariable (at this age, half or more of the amplitude of accommodative power is lost and must be replaced by plus lenses). The visual system also has spe cial significance in that study of this system has greatly advanced our knowledge of both the organization of all sensory neuronal systems and the relation of percep tion to cognition. Furthermore, the eyes, because of their diverse composition of epithelial, vascular, neural, and pigmentary tissues, are virtually a medical microcosm, susceptible to many diseases, and its tissues are available for inspection through a transparent medium. Impairment of visual function, expressed as defects in acuity and alterations of visual fields, obviously stands as the most important symptom of eye disease. Still later in life, cataracts, glaucoma, retinal vascular occlusion and detachments, macular degenera tion, and tumor, unilateral or bilateral, are the most fre quent causes of visual impairment. As a rule, episodic visual loss in early adult life, often hemianopic, is the result of migraine. The other impor tant cause of transient (weeks) monocular visual loss in this age period is optic neuritis, often a harbinger of mul tiple sclerosis. Amaurosis in the child or young adult may also be caused by systemic lupus erythematosus and the related antiphospholipid syndrome, or by migraine, or there may be no discernible cause. Later in life, transient monocular blindness, or amaurosis Jugax, lasting minutes Amaurosis is a general term that refers to partial or to hours is more common; it is caused by vascular dis ease, particularly stenosis of the ipsilateral carotid artery. Amblyopia refers to any monocular 13-1 lists the main causes of episodic monocular deficit in vision that occurs in the presence of normal ocular structures. A major cause of amblyopia is the suppression by the brain of vision from one eye during early childhood caused by either strabismus, anisome tropia (a significant difference in refractive error), or by media opacities. Of course, at any age, diseases of the retina and of other components of the ocular apparatus are important causes of progressive visual loss, and the prob lem may at first be transient. Nyctalopia is the term for poor twilight or night vision and is associated with extreme myopia, cataracts, vitamin A deficiency, retinitis pigmentosa, and, often, color blindness. There are also a number of posi tive visual symptoms (phosphenes, migrainous scintil lations, visual illusions, and hallucinations), but they are generally less significant than symptoms of visual loss. Irritation, redness, photophobia, pain, diplopia and stra bismus, changes in pupillary size, and drooping or clo sure of the eyelids are other major ocular symptoms and signs. Impairment of vision may be unilateral or bilateral, sudden or gradual, episodic or enduring. In infancy, congenital defects, retinopathy of prema turity, severe myopia, hypoplasia of the optic nerve, optic pits, and coloboma are the main causes. Examination of the eye movements is also essential, particularly if amblyopia predicated on an early life strabismus is suspected, as discussed in Chap. Each eye is tested separately and, if glasses are required, glasses for distance, not reading glasses, should be worn.

Pain is elicited by the straight-leg raising test or one of its vari ants gastritis diet 500 buy prevacid online now, and protective nocifensive reflexes come into play gastritis diet karbohidrat buy prevacid uk, limiting further elevation of the leg gastritis diet ��� cheap 30mg prevacid visa. Weakness chronic gastritis guideline 15mg prevacid, if present diet to help gastritis discount prevacid online visa, involves the extensors of the big toe and foot and the foot invertors (a distinguishing feature of foot drop originating in pero neal nerve damage) the gastritis diet discount 15 mg prevacid mastercard. The ankle j erk may be diminished (more often it is normal), but the knee jerk is hardly ever altered. With lesions of the first sacral root (51), the pain is felt in the midgluteal region, mid-posterior part of the thigh, posterior region of the calf to the heel, outer plantar sur face of the foot, and fourth and fifth toes. Mechanisms of compression of the fifth lumbar and first sacral roots by herniated lumbosacral discs. Paresthesia and sensory loss are mainly in the lower part of the leg and outer toes, and weakness, if present, involves the plantar flexor muscles of the foot and toes, abductors of the toes, and hamstring muscles. Walking on the toes is more difficult and uncomfortable than walking on the heels because of weakness of the plantar flexors. The less-frequent lesions of the third (L3) and fourth (L4) lumbar roots give rise to pain in the anterior part of the thigh and knee and anteromedial part of the leg (fourth lumbar), with corresponding sensory impair ment in these dermatomal distributions. Third lumbar (L3) motor root lesions may weaken the quadriceps, thigh adductor, and iliopsoas; lA root lesions weaken the anterior tibial innervated muscles, sometimes with a mild foot drop. First lumbar (Ll) root pain is pro jected to the groin, and L2, to the lateral hip. Some patients have a distinctive syndrome asso ciated with extreme lateral disc protrusions, particu larly those situated within the proximal portion of the intervertebral spinal foramina. Unremitting radicular pain without back pain and a tendency to worsen with extension of the back and torsion toward the side of the herniation are characteristic. Both of these configurations may confound clinical and radio logic diagnosis and make surgery more difficult. Rarer still, and often clinically obscure, are protru sions of Anomalies of the lumbosacral roots may lead to errors in localization (see descriptions by Postacchini et al). The combined rupture of two or more discs occurs occa sionally and complicates the clinical picture. When both the L5 and Sl roots are compressed by a large herniated disc, the signs of the Sl lesion usually predominate. Herniation may occur directly into the adjacent ver tebral body, giving rise to a Schmorl nodule. In such cases there are no signs of nerve root involvement although back pain may be present, sometimes recurrent and referred to the thigh. Trauma, particularly hard falls on the heels or buttocks, is an important caus ative factor. Deep boring spine pain; root pain circling the body or projected to the abdomen or thorax (some times simulating visceral disease); paresthesias below the level of the lesion; loss of sensation; both deep and superficial; and paraparesis or paraplegia are the usual clinical manifestations. Diagnosis When all components of the lumbar disc syndrome are present, the diagnosis can be made with reasonable confidence. Furthermore, the above descriptions of single root compression refer mainly to signs and symptoms of typical posterolat eral disc protrusion. Very large of neurological deficits, imaging generally need not be undertaken until the pain has persisted for several weeks (see Chou and colleagues). This, of course, may not be necessary if the pain is manageable and surgery is not contemplated (see further on). The posteriorly protruding disc material indents and elevates the anterior thecal sac and narrows the spinal canal. The disc space at this level is narrowed and the disc is less hyperintense than normal because of desiccation and the extruded component. Axial view showing the focal right paracentral posterior disc herniation (large arrow) protruding into the canal and compressing the traversing nerve root (the right can be seen laterally to the disc (small arrows). Loss or marked asymmetry of the H reflex is another useful indication of S1 radiculopa thy, but this simply corroborates the loss of an Achilles reflex. The finding of denervation potentials in the para spinal muscles (indicating root rather than peripheral nerve lesions) and in muscles that conform to a root dis tribution is also helpful, but again, some weeks must have elapsed from the onset of root pain for these findings to be present. An entirely normal study should lead to reconsideration of the diagnosis, particularly if surgery was planned for relief of a compressive radiculopathy. In 27 percent, there was a focal or asymmetrical extension of the disc beyond the margin of the interspace (protrusion), and in only 1 percent was there more extreme extension of the disc (extrusion or sequestration). However, the time-honored tenet of prolonged bed rest has been questioned by the results of several randomized studies (Vroomen et al). It would appear that the main benefit is simply that time has passed and the expected resolution of pain has taken its course in many patients. In a few patients with severe sciatica we have been impressed with the tem porary relief afforded by administration of oral dexa methasone (4 mg every 8 h) for several days, although this approach has not been studied systematically and several of our colleagues decry it. The treatment of nerve root compression with repeated epidural injections of corticosteroids has enjoyed periods of popularity, but controlled studies have failed to confirm sustained efficacy (White et al; Cuckler et al), and it is not without compli cations including the rare but widely publicized outbreak of fungal meningitis from contaminated steroids. As with many similar studies, Carette and colleagues (1997) found only short-term improvement with epidural steroid injection and the ultimate need for surgery was not altered. Nevertheless, some pain specialists have not discarded this form of treatment in view of success in selected patients, even if short-lived. Surgical Treatment of Lumbar Disc Disease An indication for emergency surgery is an acute compression of the cauda equina by massive disc extrusion, causing bilateral sensorimotor loss and sphincteric paralysis. Although not the recommended course, it should be pointed out that there have been instances in which even a dramatic syndrome of cauda equina compression had resolved spontaneously after several weeks. If the pain and neurologic findings have not subsided in response to conservative management or the patient has suffered frequent disabling acute episodes, surgi cal treatment must be considered. In the first study, a large proportion of patients assigned to treat ment with physical therapy and pain medications had enough pain that they required surgery within several months. In addition, patients assigned initially to surgery by microdiscectomy had considerably faster relief of back and sciatic pain, but at the end of a year, both groups had minimal disability and similar degrees of minor pain. The implications of this study are that avoiding surgery initially does not have adverse consequences but if more rapid pain relief and mobilization are the aims, surgery is preferable. In the second cited study there was even greater crossover between conservative and surgically assigned groups and there was a slightly more favorable outcome in those who underwent early surgery. The surgical procedure most often indicated for lumbar disc disease is one of the variants of a hemilami nectomy with excision of the disc fragment introduced almost a century ago by Mixter and Barr. Questions relating to the relative merits of limited ("microscopic"), or minimally invasive excision of the lamina are often raised by patients and no clear answer can be given except that individual surgeons excel at one or another technique and the outcomes are similar. Rerupture occurs in approximately 5 percent of operated cases according to Shannon and Paul. Spinal fusion of the involved segments is indicated in cases in which there is instability, usually related to extensive or prior surgery or to an anatomic abnormality. Our practice would be to avoid surgery in such cases, but to endorse physical therapy. Compression of the cauda equina by epidural masses, as described further on, most often begins with back pain or sciatica. The sciatic nerve or the plexus from which it originates may be directly implicated in tumor (lymphoma, neurofibrosarcoma). At one time, all these cases were classified as sciatic neuritis or "sacroiliac strain. Operations became some what indiscriminately practiced, not only for frank disc protrusion but also for "hard discs" (unruptured) and related pathologies of the spine. In large referral centers, the surgical results became decreasingly satisfactory until recently, as many patients were being seen with unrelieved postlaminectomy pam as with unoperated ruptured discs. Other cases of chronic sciatic pam are due to one of a number of pathologic entities. An unusual Guillain-Barre syndrome may also produce misleading back and radicular pain before weakness is apparent. The caudal roots in these diseases usually enhance with plexitis) akin to brachial neuritis, which may cause sciatica, as lumbosacral plexus neuritis (Wartenberg is a unilateral (occasionally bilateral) disorder does occasionally nerve infarction or damage from dia stenosis of the lateral recess, betes, herpes zoster, parvovirus, or a retroperitoneal mass (see Chap. Again, if one sees enough of these cases, the cause of a number of them, particularly those with bilateral burn ing along the sciatic nerve, cannot be determined. Lateral recess stenosis in particular may be a cause of sciatica not relieved by conventional disc surgery (see below, under "Lumbar Stenosis"). Synovial cysts arising from a facet joint are not uncommon, and even very small ones may be situated in the proximal portion of the foramen, thereby causing sciatica. Another surprising finding in the course of imaging the spinal canal is a cyst-like dilatation of the perineurial sheath (Tarlov cysts). One or more sacral roots may be involved at points where they penetrate the dura and may be associated with radicular symptoms. There are reports of relief from opening the cysts and freeing the roots, but the results seem more uncertain to us. Sciatica that is temporally linked to the premenstrual period is usually a result of endometriosis involving the nerve at the sciatic notch ("catamenial sciatica"). We have also observed cases of sciatica that occurred with each preg nancy, presumably from uterine traction on the nerve. The notion of a pyriformis (piriformis) syndrome, so named by Kopell and Thompson, has arisen as a cause of otherwise unexplained buttock pain or vague sciatica. The muscle overlies or, in a small proportion, embeds the peroneal trunk of the sciatic nerve. Hypertrophy, spasm, or simply the anatomic variation in which the nerve is entrapped in the tendinous origin of the muscle have all putatively caused local and some degree of sciatic pain. Sciatica in these cases is elicited by stretching the muscle through flexion, adduction, and internal rotation of the hip. The validity of this syndrome is uncertain and it has been the subject of polemical discussions in the lit erature. In the lumbar region, these osteoarthritic and related degenera tive changes lead to compression of one or more lumbar and sacral roots because of narrowing of the spinal canal. The roots are typically compressed between the posterior surface of the vertebral body ante riorly, the facet joint laterally, and the ligamentum flavum posteriorly. The usual features of lumbar stenosis are of fluctuat ing aching and sharp pain in the low back, buttock and sciatic distribution, occasionally including femoral areas, and generally elicited by prolonged sitting, standing, or walking and relieved by rest. Some patients have virtu ally constant pain in these areas but still have relief with rest in one or another body position. In the distinctive syndrome of "neurogenic claudi cation", standing or walking causes a gradual onset of numbness and weakness of the legs, usually with asym metrical sciatic, calf, or buttock discomfort that forces the patient to sit down. Often the numbness begins in one leg, spreads to the other, and ascends as standing or walking continues. The ankle tendon reflexes may disappear after walking a distance, only to return on flexing the spine. Disturbances of micturition and impotence are infrequent unless there has been an additional more acute disc herniation. In some patients with lumbar stenosis, neurologic symp toms persist without relation to body position. The process is distinguished from vascular claudication of the legs by its appearance in the standing position, the prominence of numbness in some cases, and, of course, by the preservation of distal leg pulses and loss of ankle reflexes in the neurogenic variety. This "claudication of the cauda equina" was described by van Gelderen in 1 948, and it was shown by Verbiest to not be caused by ischemia but by encroach ment on the cauda by hypertrophied joints, thickened ligaments, and protrusions of disc material on a develop mentally shallow canal. Later, the canal is also narrowed from side to side (reduced inter pedicular distance). A prominent feature of many cases of the degenera tive spinal disorder is displacement and malalignment of one vertebral body in relation to the adjacent one, or spondylolisthesis. This may cause little difficulty at first but eventually the patient complains of limitation of motion and pain in the low back radiating into the thighs. Compression of the corresponding spinal roots by the displaced vertebrae causes paresthesia and sensory loss, muscle weakness, and diminished reflexes. When spondylolisthesis is unstable, new symptoms may appear abruptly in the form of a foot drop, urinary retention, or overflow incontinence. The spinal instability is evidenced on conventional radiographs by a change in the diameter of the spinal canal as the patient moves between the flexed and extended position of the back. A striking syndrome that has been attached to lum bar stenosis consists of painful legs-moving toes, described by Spillane. There is burning leg pain and continuous and complex rhythmic movements of the toes, as the name implies. Lumbar nerve root compression, most often from lumbar stenosis, or other types of peripheral damage underlie most cases. Treatment of Lumbar Stenosis Decompression of the spinal canal relieves the symptoms of lumbar stenosis in a considerable proportion of cases, but the results have been inconsistent. Patients must be chosen carefully for surgery, and success is likely if the clinical features con form to the typical syndrome, mainly pain that altered in various positions and at least partially relieved by rest, with definite evidence of root compression by imaging. In perhaps the most careful, controlled trial comparing sur gery to conservative treatment for lumbar spinal stenosis, pain and overall function at 2 years was several-fold bet ter in those who had operations (Weinstein et al, 2008). However, interpretation was hampered by a large number of patients who crossed over between arms of the study. Issues pertaining to the methodology of operation, the need for fusion of the lumbar spine to limit mobility, and various forms of "instrumentation" are of great interest, but are best discussed in textbooks of neurosurgery and orthopedics. Insofar as lumbar stenosis is a cauda equina syndrome, its differential diagnosis is also considered in Chap. The muscle pain that is brought on by exercise and promptly relieved by rest most frequently involves the calf and thigh muscles. If the atherosclerotic narrowing or occlusion implicates the aorta and iliac arteries, it may also cause hip and buttock claudication and impotence in the male (Leriche syndrome). Ischemic rest pain-and sometimes attendant ulceration and gangrene is usually localized to the foot and toes; it is the consequence of multiple sites of vascular occlusion. Pain at rest is characteristically worse at night and totally or partially relieved by dependency. The examination of such patients will reveal a loss of one or more peripheral pulses, trophic changes in the skin and nails (in advanced cases), and the presence of bruits over or distal to sites of narrowing. The similarities to a clau dicatory syndrome of lumbar spine stenosis have already been discussed.

One of the most provocative new observations regarding memory has been the enhancement of perfor mance by electrical stimulation of the entorhinal area in individuals with epilepsy gastritis symptoms purchase online prevacid. The study by Suthana and col leagues is one of several demonstrating this effect in an improved ability to retain topographic-spatial landmarks in a simulated exercise gastritis diet ��������� purchase 15mg prevacid overnight delivery. At a minimum gastritis bleeding cheap 15mg prevacid amex, these findings confirm the critical role of parahippocampal regions (per forant pathways) in forming and stabilizing memories gastritis diet 21 cheap 30 mg prevacid visa, in these cases gastritis pernicious anemia discount generic prevacid uk, the major source of afferent input to the hippocampus chronic gastritis reversible purchase 15 mg prevacid visa. Strengthening synaptic connections among this net work serves to establish the memory. This may occur through long-term potentiation, as the work of Kandel has emphasized in experimental models. It is not clear if a hippocampal neuron is the trigger to the memory ensemble or the entirety of hippocampal system serves a generic role in cohering all memories. The cellular mechanisms involved in learning and the formation of memories are only beginning to be understood. Whether physiologic phenomena such as long-term potentiation or anatomic changes in the dendritic structure of neurons are at the center of memory storage is not known; cer tainly both are likely to be involved. The neurochemical systems that are activated during formation and recall of memory are also obscure. The anatomic and physiologic mechanisms that govern immediate registra tion, which remains intact in even the most severely dam aged patients with the Korsakoff amnesic syndrome has not been fully deciphered. Other psychologic features of human memory that must be accounted for by any model purporting to explain this function are the importance of cueing in eliciting learned material and the imprecision of past mem ories, allowing for unwitting embellishment and false rec ollection, to the point of fabrication. The latter aspect has been a topic of considerable importance in children who have (or have not) been subjected to sexual abuse and in adults and children whose memories of past abuse have been suggested by the examiners (see Schacter). The separate roles of the thalamus, the hippocampi, and the frontal lobes in memory and the differences in the nature of the amnesia resulting from damage at each site remain to be clarified. That isolated thalamic lesions, without implicating medial temporal areas, can cause a Korsakoff syndrome is evident from the expe rience with alcoholism and stroke. Graff-Radford and colleagues have found that with purely thalamic lesions, as appreciated by imaging studies, anterograde learning is more affected than retrograde recall; but comparing these functions quantitatively is difficult. Kopelman, in reviewing his own studies and those of others, concludes that the differences are subtle and pertain mostly to tem poral ordering and the modality of information, which is degraded more with diencephalic-temporal lesions than with frontal lobe damage. Each of the amnesic states listed in Table 21-5 is con sidered at an appropriate point in subsequent chapters of this book. The only exception is the striking syndrome of transient global amnesia, the nature of which is not certain. Bilateral or left (dominant) hippocampal infarction because of atherosclerotic-thrombotic or embolic occlu sion of the posterior cerebral arteries or their inferior temporal branches Bilateral or left (dominant) infarction of anteromedial thalamic nuclei C. Infarction of the basal forebrain due to occlusion of ante rior cerebral-anterior communicating arteries D. Subarachnoid hemorrhage (usually rupture of anterior communicating artery aneurysm) E. Cardiac arrest, carbon monoxide poisoning, and other hypoxic states (hippocampal damage) G. Hysteria Arrmesic syndrome of subacute onset with varying degrees of recovery; usually leaving permanent residua A. Tumors involving the floor and walls of the third ven tricle and limbic cortical structures Alzheimer disease (early stage) and other degenerative disorders with disproportionate affection of the temporal lobes C. The condition was characterized by an episode of amnesia and bewilderment lasting for several hours. The symptoms had their basis in an amnesia for events of the recent past coupled with an ongoing anterograde amnesia. During the attack, there is no impairment in the state of consciousness, no other sign of confusion, and no overt sei zure activity; personal identification is intact, as are motor, sensory, and reflex functions. Unlike psychomotor epilepsy, the patient is alert, in contact with his surroundings, and capable of high-level intellectual activity and language function during the attack. As soon as the episode has ended, no abnormality of mental function is apparent except for a permanent gap in memory for the period of the attack itself and for a brief period (hours or days) preceding it. Incomplete or mild attacks are infrequent, and they may be as brief as 1 h, but are typically longer. The condition is among the most curious in neurology and may be mistaken for a psychiatric episode. Hodges and Ward have made detailed psychologic observations in 5 patients during an episode. The psy chologic deficit, except for its transience, was much the same as that in a permanent amnesia syndrome. Personality, cognition involving high-level functioning, semantic language, and visuospatial discrimination were all preserved. The duration of retro grade amnesia was highly variable, but characteristically it shrank after the attack, leaving a permanent retrograde gap of about 1 h. However, subtle impairment of new learning persisted for up to a week after the acute attack insofar as this defect could be detected by special testing. The recurrence of such attacks is not uncommon, having been noted in 66 of 277 older adults who were observed for an average period of 80 months (Miller et al) and in 16 of 74 patients followed for 7 to 210 months (Hinge et al). One of our patients had more than 50 attacks, but among all the rest (more than 100 cases), 5 was the maximum. It seems children are not susceptible to the condition; however, a 13-year old and 16-year-old with migraine were reported to have had similar attacks during participation in sports (Tosi and Righetti). No consistent antecedent events have been identi fied, but certain ones-such as a highly emotional experi ence like hearing of the death of a family member, pain, exposure to cold water, sexual activity, and mild head trauma-have been reported in some cases (Haas and Ross; Fisher). The similarity to postconcussive amnesia is notable; this is always a concern if the patient was not under observation at the onset of the attack. We have also seen several patients in whom the attacks appeared after minor diagnostic procedures such as colonoscopy; but the residual effects of sedation are suspect in some of these. Curiously, they attributed the discharges to ischemic lesions during drug-induced sleep. Palmini and coworkers cite exceptional cases of pure amnesic seizures in temporal lobe epilepsy, but even in their best examples, ictal and postictal function was not normal. Transient global amnesia may be ischemic or per haps migrainous in nature, though not atherosclerotic thrombotic, but rarely (if ever) do the attacks progress to stroke. From indirect evidence of retrograde blood flow in the internal jugular arteries during the Valsalva maneuver (occasion ally reported to precipitate an attack), Sander and col leagues and Chung and coworkers have suggested that venous congestion of the temporal lobes was operative. Abnormalities of posture, movement, sensation, and reflexes cannot be relied on to disclose the disease process. Suspicion of a dementing disease is aroused when the patient presents multiple complaints that seem totally unrelated to one another and to any known syndrome; when symptoms of irritability, nervousness, and anxiety are vaguely described and do not fit exactly into one of the major psychiatric syn dromes; and when the patient is incoherent in describing the illness and the reasons for consulting a physician. The precipitation of identical attacks by, vertebrobasilar and coronary angiography is also sugges tive of an ischemic or migrainous causation. This pro vides a potential explanation for the association of highly emotional events prior to an episode. In addition, the mode of answering and solving problems gives invaluable information about the mental operations of the subject and must be incor porated into any analysis of cognition. A perplexed or slowed individual may ultimately perform adequately but nonetheless have seriously flawed cortical or subcor tical function. Each of the tests below is necessarily an abstraction but ones that separate particular functions of the brain. As already emphasized, the patient must have normal, or nearly so, attentiveness to carry out these tasks and a deficiency in any one of them may disrupt the per formance of others. Verbal trail making (reciting alternating letters of the alphabet and their ordinal place, i. The capacity to repro duce them at intervals after committing them to memory is a test of memory span. Another test of memory and verbal fluency we have found useful is the generation of a list of objects in a category; ask the patient to give the names of animals, vegetables, or makes of cars, as many as come to mind in 30 s or so; most individu als can list at least 12 items in each category. Visual facility: Show the patient a picture of several objects; then ask him to name the objects. Subtraction of serial 3s and 7s from 100 is a good test of calculation as well as of concentration. Constructions: Ask the patient to draw a clock and place the hands at 7:45, a map of the United States, a floor plan of her house; ask the patient to copy a cube and other figures. General behavior: Attitudes, general bearing, evidence of hallucinosis, stream of coherent thought and atten tiveness (ability to maintain a sequence of mental operations), mood, manner of dress, etc. Special tests of localized cerebral functions: Grasping, sucking, aphasia battery, praxis with both hands, and corticosensory function. To enlist the full cooperation of the patient, the physician must prepare him for questions of this type. It could be pointed out to the patient that some individuals are rather forgetful or have difficulty in concentrating, or that it is necessary to ask specific questions in order to form some impression about his degree of nervousness when being examined. If the patient is agitated, suspicious, or belligerent, intellectual functions must be inferred from his remarks and from information supplied by the family. Orientation (knowledge of personal identity and pres ent situation): What is your name, address, telephone number Long-term: Tell me the names of your children (or grandchildren) and their birth dates. We also find it useful to quiz the patient about cultural icons of the past that are appropriate to his age. Recent past: Tell me about your recent illness (com pare with previous statements). Immediate recall (attention, short-term working mem ory): Repeat these numbers after me (give series of 3, 4, 5, 6, 7, 8 digits at a speed of 1 per second). In our experience, a high level of perfor mance on all tests eliminates the possibility of dementia in almost all cases. It may fail to identify a dementing disease in an uncooperative patient and in a highly intel ligent individual in the earliest stages of disease. The question of whether to resort to formal psycho logic tests is certain to arise. Such tests yield quantitative data of comparative value but cannot of themselves be used for diagnostic purposes. A score of 24 on the widely used "mini-mental" is considered normal and scores below 21 generally indicate cognitive impairment. Patients with lower levels of education and older age have lower nor mative scores, but even individuals in their eighties with a high school education score 23 or above if not demented (see Crurn et al for age and education adjusted normal score). In this test, an index of deterioration is provided by the discrepancy between the vocabulary, picture-completion, and object-assembly tests as a group (these correlate well with premorbid intelligence and are relatively insensitive to dementing brain disease) and other measures of general perfor mance, namely arithmetic, block-design, digit-span, and digit-symbol tests. Questions that measure spatial and temporal orientation and memory are the key items in most of these abbreviated scales of dementia. All of the aforementioned clinical and psychologic tests, and several others as well, measure the same aspects of behavior and intellectual function. X-J Ask the patient to copy a pair of intersecting pentagons onto a piece of paper. If the disorder of mental function is severe, it is helpful if a nurse, attendant, or member of the family can stay with the patient at all times. The primary responsibility of the physician is to diagnose the treatable forms of dementia and to insti tute appropriate therapy. If it is established that the patient has an untreatable dementing brain disease and the diagnosis is sufficiently certain, a respon sible member of the family should be informed of the medical facts and prognosis and assisted in the initiation of social and support services. In the past, it was considered that patients themselves need be told only that they have a condition for which they are to be given rest and treatment. Most physicians (and p atients) find this too patronizing; certainly, in the current social environment, patients ask directly if they have Alzheimer disease. To this query we usually respond that they may, but that more time is required to be certain. Some intelligent patients have insisted on knowing the details and implications of this state ment, and we have felt obliged to give as much useful information as required by them. Reassurance that the physician will be available to help the patient and family manage the situation is of utmost value. If the dementia is slight and circumstances are suitable, patients should remain at home for the first years, continuing to engage in those accustomed activities of which they are capable. They should be spared responsibility and guarded against injury that might result from imprudent action, such as leaving a stove turned on or driving and getting lost-or worse. If they are still at work, plans for occupational retirement should be carried out. In more advanced stages of the disease, when mental and physical enfeeble ment become pronounced, a skilled nursing facility or supervised home care should be arranged. The value of centrally acting cholinergic agents and glutamate antagonists in the treatment of Alzheimer disease is modest but clear and should be weighed against the need for blood testing and side effects. These medications, however, offer psychologic benefit to the patient and family; Chap. Undesirable restlessness, nocturnal wandering, and belligerency may be reduced by administration of one of the antipsychotic or benzodiazepine drugs (see Chaps. Although randomized trials of these drugs have failed to show benefit in extreme circum stances, partly as a result of poor tolerance, there are few other options. Emotional lability and paranoid tenden cies may be managed by the judicious use of quetiapine, olanzapine, risperidone, or haloperidol. Some patients are helped by short-acting sedatives such as lorazepam without any worsening of the mental condition, but all these drugs must be given with caution and some may be particularly problematic in patients with combined parkinsonism and dementia syndromes. Visiting nurses, social agencies, live-in healthcare aides, day care settings, and respite care to relieve fami lies from the constant burden of caring for the patient should all be used to advantage. Some of the inevitable practical problems accompanying the dissolution of per sonal life caused by dementia can be ameliorated by judicious use of powers of attorney or guardianship and similar legal vehicles. Mishkin M, Delacour J: An analysis of short-term visual memory in the monkey I Exp Psycho/ A nim Behav Proc 1:326, 1975.

In men gastritis loose stools buy prevacid 30mg fast delivery, there tends to be a single peak gastritis diet chart buy 30 mg prevacid overnight delivery, whereas women have a multiple epi sodes of increased secretion gastritis prognosis order prevacid 15 mg with mastercard. The secre tion of cortisol and particularly of thyroid-stimulating hormone peaks at the onset of sleep gastritis diet king prevacid 15mg overnight delivery. Melatonin chronic gastritis can be cured discount 15mg prevacid, elaborated by the pineal gland gastritis diet journal template cheap prevacid express, is produced at night and ceases upon retinal stimulation by sunlight (see Chap. Prolactin secretion increases during the night in both men and women, the highest plasma concentra tions being found soon after the onset of sleep. Circadian mechanisms and the stages of sleep alter testosterone secretion and are therefore disrupted by sleep disorders, especially in younger individuals. Also, an increased sleep-associated secretion of luteinizing hormone occurs in pubertal boys and girls. A refinement of these views has elaborated the complex interaction of specially functioning nuclei in the hypothalamus, pons, and basal forebrain. Reciprocal connections among these areas, modulated by input from regions of the brain that sense environmental conditions, allow the organism to adapt sleep cycles to its needs and to external circumstances. The orexin neurons act through the monoaminergic system as a stabilizing influence to prevent rapid transitions from one state to the other. Cholinergic n eurons are found in two major loci in the parabrachial region of the dor solateral pontine tegmentum-in the pedunculopontine group of nuclei and the lateral dorsal tegmental group. The cholinergic cell groups project rostrally, but the precise anatomy of this projection system has not been defined. Cells from these groups make up parts of the ascending reticular activating system. Single-cell recordings from the pontine reticular formation suggest that there are two interconnected neuronal populations whose levels of activity fluctuate periodically and recip rocally. During wakefulness, according to this conceptu alization, the activity of aminergic (inhibitory) neurons is high; because of this inhibition, the activity of the cho linergic neurons is low. It is likely that these monoaminergic neuronal circuits are modulated by input from hypocretin (also called orexin) secreting neurons of the hypothalamus, but the details of this control system are not entirely known. Hypocretin, a peptide that assumes great importance in the pathophysi ology of narcolepsy, is discussed further on. Thi s inhibits the orexin neurons, fur ther preventing monoaminergic activation that might interrupt sleep. Insofar as the bulk of cholinergic and aminergic neu rons are found in the pedunculopontine group of nuclei, Shiromani and colleagues have suggested that interaction between these neurons occurs in the region of the pedun culopontine nuclei rather than in the medial pontine retic ular formation, as suggested by Hobson and associates. Solms has proposed that the dopaminergic systems in the basal forebrain areas elicit or modulate dreaming. This view is supported by reports of diminished dream ing in patients being treated with dopaminergic blockers and the enhancement of dreaming reported by patients taking L-dopa or dopamine agonsits. Notable in this regard is the fact that major intracortical dopaminergic pathways originate in the frontal lobes. As with the earlier-described anatomic and neurochemical data, the degree to which similar electrophysiologic changes are reflected in humans is not known. Most of the integrated rhythms of sleep that are recorded at the surface of the brain, including the background activity of slow-wave sleep and the faster and more synchronized sleep spindles and vertex waves, have their origins in the thalamus. Steriade and colleagues have performed a substantial amount of the modern work in this area and s umm a rize it in their review. It is evident that there is as yet no agreement concerning the integration of all these brainstem and thalamic-hypothalamic mechanisms in the production of sleep or of dreams. Based on these and similar studies, several authors have speculated that the suppression of frontal lobe activity during dreaming, at a time when visual association areas and their paralimbic connections are activated, might explain the uncritical acceptance of the bizarre visual content, the disordered temporal relationships, and the heightened emotionality that characterize dreams. As an alternative that links dreams to inherent meaning for the individual, Solrns suggested that activation of frontal doparninergic systems during dreaming, the same pathways that partic ipate in most biologic drives, implies that dreams express latent wishes and drives-a psychoanalytical interpreta tion expressed by Freud in his book the Interpretation of Dreams. The Effects of Sleep Deprivation Deprived of sleep, experimental animals will die within a few weeks, no matter how well they are fed, watered, and housed (Rechtschaffen et al), but whether a similar degree of sleep deprivation leads to death in humans is unknown. Nevertheless, humans beings deprived of sleep do suffer a variety of very unpleasant symptoms quite distinct from the effects of the usual types of insomnia. Despite many studies of the deleterious emotional and cognitive effects of sleeplessness, we still know little about them. Performance of skilled motor activities also deteriorates; if the tasks are of short duration and slow pace, the subject can manage them, but if speed and perseverance are demanded, he cannot. Self-care is neglected, incentive to work wanes, sustained thought and action are interrupted by lapses of attention, judg ment is impaired, and the subject becomes decreasingly inclined to communicate. With sustained deprivation, sleepiness becomes increasingly more intense, momen tary periods of sleep ("microsleep") become more intru sive, and the tendency to all types of accidents becomes more marked. Eventually, subjects fail to perceive inne r and external experiences accurately and to maintain their orientation. Illusions and hallucinations, mainly visual and tactile ones, intrude into consciousness and become more persistent as the period of sleeplessness is prolonged. This may be a component of the decompen sation of individuals with bipolar psychiatric disease, sometimes triggering manic episodes. Neurologic signs of sleep deprivation include a mild and inconstant nystagmus, impairment of saccadic eye movements, loss of accommodation, exophoria, a slight tremor of the hands, ptosis of the eyelids, expressionless face, and thickness of speech, with mispronunciations, and incorrect choice of words. Rarely and probably only in predisposed persons, loss of sleep provokes a psychotic episode (2 to 3 percent of 350 sleep deprived patients studied by Tyler); however, many sleep specialists dispute the production of psychosis. During recovery from prolonged sleep depriva tion, the amount of sleep obtained is never equal to the amount lost. This is probably a result of the intrusion of brief sleep periods during the waking state and repre sents a sizable amount of time if s ummated (it is virtually impossible to deprive a human being or animal totally of sleep). N3 seems to be the most important sleep stage in restor ing the altered functions that result from prolonged sleep deprivation. Because the need for sleep varies considerably from person to person, it is difficult to decide what constitutes sleep deprivation. Certain individuals apparently func tion well on 4 h or even less of sleep per 24-h period, and others, who sleep long hours, claim not to obtain maxi mum benefit from it. Precision as to what constitutes patho logic insomnia is impossible at the present time because of our uncertainty as to the exact amounts of sleep required, and the role of sleep in the economy of the human body. All that can be said is that some form of sleeplessness is a frequent complaint (20 to 40 percent of the population) and is more prominent in the elderly and in women. Only a small proportion of persons who perceive their sleep to be inadequate seek professional help or use sleeping pills, according to Mellinger and colleagues. Two general classes of insomnia can be recognized one in which there appears to be a primary abnormality of the normal sleep mechanism, and another in which the sleep disturbance is secondary to , or perhaps more accu rately comorbid with, a medical or psychologic disorder. Polysornn ographic studies have defined yet another subgroup who actually sleep enough, but who perceive their sleep time to be shortened or disrupted ("paradoxi cal insomnia"). Restless Legs Synd rome, Periodic Leg Movem ents of Sleep, and Related Disorders the disorder known as the restless legs syndrome may regularly delay the onset of sleep and usually occurs in its early stages. This disorder is surprisingly prevalent, affecting more than 2 percent of the population. The patient may complain of unpleasant aching and drawing sensations in the calves and thighs, often associated with creeping or crawling feelings; other descriptions have included "worms," "internal itch," and "coldness," and the legs may feel tired, heavy, and weak. The symptoms are provoked by rest, and rapidly, but temporarily, relieved by moving the legs. An urge to move the legs can be suppressed voluntarily for a brief period but is ultimately irresistible. It is interesting that a small proportion of patients have similar symptoms in the arms after many years of symptoms. There may be variants of nocturnal restlessness in other parts of the body such as the abdomen, as suggested by Perez-Diaz and colleagues. Their patients described an unpleasant abdominal mus culature restlessness that required movement for relief and was eliminated with dopamine agonists. Fatigue worsens restless legs syndrome, and there is a tendency for it to be worse in warm weather. In a few patients, mainly older ones with a severe form of the nighttime disorder, these movements and an asso ciated myoclonus spill over into wakefulness and are accompanied by restlessness, foot spasms, foot stamping, body rocking, and marching that are only partly under voluntary control. The daytime phenomena may require several medications used simultaneously for control. Iron-deficiency anemia and low ferritin levels are associ ated with the syndrome in many instances, as is thyroid disease, pregnancy, and certain drugs, such as antide pressants and antihistamines. Occasionally, it is a prelude to a peripheral neuropathy, particularly in relation to uremia. The basis for this relationship is not well defined, but it makes it advisable to check for reduced iron stores and anemia in most patients. Another potential relationship, unproved, is that iron is a cofactor for the enzyme, tyrosine hydroxylase, which is required to produce dopamine. Like the restless legs syndrome, it may result in sleep deprivation and daytime somnolence or, more often, in disturbance of a bed partner. In some patients, like those described by Hauri and Olmstead, the disorder is lifelong. Unlike the rare individuals who seem to be satisfied with 4 h or even less of sleep a night, insomniacs suffer the effects of partial sleep deprivation and resort to medications, alcohol, and their lives come to revolve around sleep to such an extent that they have been called "sleep ped ants" or "sleep hypochondriacs. Personality inventories have disclosed a high incidence of psycho logic disturbances in this group, but whether these are cause or effect is not clear. Although insomniacs, regard less of the cause, tend to exaggerate the amount of sleep lost, primary insomnia should be recognized as an entity and not passed off as a neurotic quirk. Of the medical disorders conducive to abnormal wakefulness, certain ones stand out-pain in the joints or in the spine, abdomi nal discomfort from peptic ulcer and carcinoma, pulmo nary and cardiovascular insufficiency, and the nocturia engendered by prostatism. Originally described as "nocturnal myoclonus," periodic leg movements are slower than myoclonic jerks. They consist of a series of repetitive movements of the feet and legs occurring every 20 to 90 s for several minutes to an hour; mainly the anterior tibialis is involved, with dorsi flexion of the feet and big toes, sometimes followed by flexion of the hip and knee. The movements are similar to the triple-flexion (Babinski) response, which can be elicited in normal sleeping persons. These movements produce frequent microarousals or, if severe and peri odic, full arousals. The patient, usually unaware of these sleep-related movements at the time they occur, is told of them by a bed mate or suspects their occurrence from the disarray of the bedclothes. Periodic leg movement is closely associated with the restless legs syndrome and many sleep specialists consider it an integral part of the syndrome, but it also occurs independently with narco lepsy, sleep apnea, following the use of tricyclic and sero tonin reuptake inhibiting antidepressants, L-dopa, and withdrawal from anticonvulsants and sedative-hypnotic drugs. Approximately eighty percent of individuals with restless leg syndrome will display periodic leg move ments, but the opposite is not the case, as only twenty to thirty percent of patients with periodic leg movements have restless leg syndrome. A seminal genetic finding by Stefansson and col leagues derived from several populations, including the homogenous Icelandic, is that a nucleotide variant in a short segment of chromosome 6p is associated with peri odic leg movements of sleep. If nothing else, as pointed out by the authors, this establishes that periodic limb movements are a distinct entity as defined in the era of genomics. The biologic significance and frequency in other populations of this variant is not yet known. Nonetheless, we continue to be impressed at the frequent cooccurrence of the two conditions and several shared underlying conditions such as iron deficiency, and treatments that are effective in both. Treatm e nt A search for iron deficiency, and its correction if present, is indicated in almost all cases. A large number of symp tomatic medications have proved helpful in the treatment of both the restless legs syndrome and periodic leg move ments. As a first choice, many practitioners favor treat ment with dopamine agonists such as prarnipexole (0. A longer acting dopamine agonist, rotigotine patch is available to treat patients who have this augmentation phenomenon. A major problem, recently recognized, is one of " aug mentation," or enhancement of the restless leg syndrome with the long-term use of this class of drugs. This is less prominent with some of the other numerous drugs that have been effective including gabapentin, pregabalin, clonazepam (0. It is sometimes useful to give a medication in 2 divided doses, the first early in the evening, and the second just before sleep or, in severe cases, during the night by setting an alarm clock before the anticipated time of symptoms. Under these circumstances, the main difficulty is in falling asleep, with a tendency to sleep late in the morning. These facts emphasize that conditioning and environmental factors (social and learned) are normally involved in readying the mind and body for sleep. Illnesses in which anxiety and fear are prominent symptoms also result in difficulty in falling asleep and in light, fitful, or intermittent sleep. In contrast, depressive illness pro duces early morning waking and inability to return to sleep; the quantity of sleep is reduced, and nocturnal motility is increased. If anxiety is combined with depression, there is a tendency for both the above patterns to be observed. Yet another common pattern of disturbed sleep can be discerned in individu als who are under great tension and worry or are over worked and tired out. These people sink into bed and sleep through sheer exhaustion, but they awaken early with their worries and are unable to get back to sleep. Furthermore, a form of drug-withdrawal or rebound insomnia may actually occur during the same night in which the drug is administered. Rebound insomnia must be distinguished from the early morning awakening that accompanies anxiety and depressive states. A wide variety of other pharmacologic agents may give rise to sporadic or persistent disturbances of sleep. Caffeine-containing beverages, corticosteroids, bronchodi lators, central adrenergic-blocking agents, amphetamines, certain "activating" antidepressants such as fluoxetine, and cigarettes are the most common offenders. Acroparesthesias, a predominantly nocturnal tingling and numbness of the fingers and palms caused by tight carpal ligaments (carpal tunnel syndrome), may awaken the patient at night (see further on, under "Sleep Palsies and Acroparesthesias").

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