Clerio Francisco de Azevedo Filho, MD, PhD

• Assistant Professor of Medicine

https://medicine.duke.edu/faculty/clerio-francisco-de-azevedo-filho-md-phd

The best approach for patients with severe disease is to continue all cardiac medications anxiety symptoms on one side of body cheap desyrel master card. A similar approach is likely beneficial for patients who do not require general anesthesia or who are undergoing low- to intermediate-risk procedures anxiety symptoms dsm cheap desyrel 100 mg buy on line. Option 2 - Limited Resuscitation: Procedure-directed During my anesthesia and in the postanesthesia care unit anxiety symptoms in toddlers 100 mg desyrel order mastercard, I anxiety symptoms long term order desyrel canada, procedures: anxiety nursing interventions cost of desyrel, refuse the following Option 3 - Limited Resuscitation: Goal-directed I, desire attempts to resuscitate me during my anesthesia and in the postanesthesia care unit only if, in the clinical judgement of the attending anesthesiologist and surgeon, the adverse clinical events are believed to be both temporary and reversible. Do-not-resuscitate orders: from the ward to the operating room; from procedures to goals. Prior to procedures requiring anesthetic care, any existing directives to limit the use of resuscitation procedures (that is, do-not-resuscitate orders and/or advance directives) should, when possible, be reviewed with the patient or designated surrogate. One of the three following alternatives may provide for a satisfactory outcome in many cases. The anesthesiologist should inform the patient or designated surrogate about which procedures are (1) essential to the success of the anesthesia and the proposed procedure and (2) which procedures are not essential and may be refused. For example, some patients may want full resuscitation procedures to be used to manage adverse clinical events that are believed to be quickly and easily reversible but to refrain from treatment for conditions that are likely to result in permanent sequelae, such as neurologic impairment or unwanted dependence upon life-sustaining technology. Ethical Guidelines for the Anesthesia Care of Patients With Do-Not-Resuscitate Orders or Other Directives That Limit Treatment. Traditionally, aspirin was withdrawn in the perioperative period because of concern of bleeding, but this practice has come under scrutiny. A meta-analysis of almost 50,000 patients undergoing a variety of noncardiac surgeries (30% taking aspirin perioperatively) found that aspirin increased bleeding complications by a factor of 1. Both type 1 and 2 diabetics should discontinue intermittent short-acting insulin (also see Chapter 29). Patients with insulin pumps continue with their lowest basal rate, which is typically a nighttime rate. Type 1 diabetics take a small amount (usually one third to one half) of their usual intermediate- to long-acting morning insulin. Metformin is held on the day of surgery but will not cause hypoglycemia if continued during fasting periods Chapter 13 Preoperative Evaluation and Medication Table 13. There is no risk of lactic acidosis with metformin in patients with a functioning liver and kidneys, and surgery does not need to be delayed in patients who take metformin on the day of surgery. Newer oral drugs (acarbose, pioglitazone) used as single-agent therapy do not cause hypoglycemia during fasting. However, to avoid confusion, all oral hypoglycemic drugs are generally withheld on the day of surgery. Stress-associated adrenal insufficiency in some patients may require additional steroids perioperatively. The risk of adrenal insufficiency may remain up to 1 year after use of high-dose steroids. Supplementation with steroids depends on the amount of stress, duration, and severity of the procedure and the regular daily dose of steroid (Table 13. Infections, psychosis, 208 poor wound healing, and hyperglycemia increase with high doses of perioperative steroids, which are rarely necessary. The exception is valerian, a central nervous system depressant, which may cause a benzodiazepinelike withdrawal when discontinued. Mandatory discontinuation of these medications, or cancellation of anesthesia when these medications have been continued, is not supported by available data. Other drugs associated with withdrawal are continued perioperatively, including anxiolytics, opioids, and nicotine-replacement therapies. They are not intended for patients undergoing procedures under local anesthesia only, when impairment of upper airway reflexes is not anticipated. Practice guidelines for preoperative fasting and the use of pharmacologic agents to reduce the risk of pulmonary aspiration: application to healthy patients undergoing elective procedures: an updated report by the American Society of Anesthesiologists Committee on Standards and Practice Parameters. Premedication to alter gastric contents may be beneficial in patients at risk for aspiration. H2 antagonists (ranitidine, famotidine), proton pump inhibitors (omeprazole), and antacids (sodium citrate) increase gastric fluid pH, whereas prokinetics (metoclopramide) stimulate gastric emptying. Innovation in best practice for preoperative preparation requires ongoing research and willingness to modify systems of care. Anesthesiologists play a key role in perioperative outcomes by identification and modification of risk throughout the perioperative period. What principles should guide the anesthesia provider when deciding whether to obtain preoperative diagnostic testing before elective surgery What is the difference between routine and disease-indicated preoperative testing A patient presents for preoperative evaluation with blood pressure of 180/110 mm Hg. A patient is receiving clopidogrel (Plavix) after drugeluting coronary stent placement. How many months after stent placement can clopidogrel be discontinued prior to elective surgery with a risk of bleeding Would the time period be different if the patient had received a bare metal stent instead A patient with chronic atrial fibrillation is receiving prophylactic warfarin therapy. How should the anesthesia provider decide whether the patient should receive anticoagulation bridging therapy before elective surgery Under what circumstances might a patient benefit from a strict "nothing by mouth after midnight" fasting period Practice advisory for preanesthesia evaluation: an updated report by the American Society of Anesthesiologists Task Force on Preanesthesia Evaluation. The value of routine preoperative electrocardiography in predicting myocardial infarction after noncardiac surgery. Selective ordering of preoperative investigations by anesthesiologists reduces the number and cost of tests. A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines 2016; 68(10):1082­1115. Low-dose aspirin for secondary cardiovascular prevention- cardiovascular risks after its perioperative withdrawal versus bleeding risks with its continuation-review and meta-analysis. American College of Physicians: preoperative pulmonary risk stratification for noncardiothoracic surgery: systematic review for the American College of Physicians. Impact of preoperative change in physical function on postoperative recovery: argument supporting prehabilitation for colorectal surgery. Postoperative complications in patients with obstructive sleep apnea: a retrospective matched cohort study. Association of sleep-disordered Preoperative Evaluation and Medication J Hosp Med. Perioperative statin therapy is associated with a significant and dose-dependent reduction of adverse cardiovascular outcomes after coronary artery bypass graft surgery. Interventional spine and pain procedures in patients on antiplatelet and anticoagulant medications: guidelines from the American Society of Regional Anesthesia and Pain Medicine, the European Society of Regional Anaesthesia and Pain Therapy, the American Academy of Pain Medicine, the International Neuromodulation Society, the North American Neuromodulation Society, and the World Institute of Pain. Perioperative management of antithrombotic therapy: antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. The relationship between glycosylated hemoglobin and perioperative glucose control in patients with diabetes. Inpatient hospital admission and death after outpatient surgery in elderly patients: importance of patient and system characteristics and location of care. Impact of age on perioperative complications and length of stay in patients undergoing noncardiac surgery. Clinical consequences of withholding versus administering renin-angiotensin-aldosterone system antagonists in the preoperative period. The ultimate responsibility for anesthetic choice lies with the anesthesia provider. The anesthesia provider must have the ability to implement a range of anesthetic plans and be prepared to address unexpected events that may necessitate a sudden change in plan. Although there is some debate about the clinical definition of general anesthesia, the components include immobility, amnesia, analgesia, and lack of patient harm. Regional anesthesia includes neuraxial (spinal, epidural, caudal) anesthesia (see Chapter 17) as well as peripheral nerve blocks (see Chapter 18). With a cooperative patient, regional anesthesia may ensure the appropriate immobility and analgesia required for surgery, without exposing the patient to the risks of general anesthesia. These definitions are used by regulatory bodies such as the Joint Commission to create standards for administration of sedation by nonanesthesiologist personnel. If general anesthesia is chosen, the anesthesia provider must then determine a plan for airway management, induction of anesthesia, maintenance of anesthesia, and immediate postoperative care. Certain patient or procedure characteristics may preclude safe regional anesthesia (Box 14. Depending on the level of sedation required, a regional technique may allow surgical anesthesia with complete preservation of upper airway reflexes, even in the patient at risk for aspiration of gastric contents. However, the anesthesia provider must be prepared to convert to general anesthesia if it becomes apparent that appropriate analgesia and immobility cannot be achieved by other means. If the imaging reveals a cerebral aneurysm requiring endovascular coiling, the anesthesia provider may be asked to convert to general anesthesia to provide patient immobility and control of ventilation during the procedure. Neuraxial and peripheral nerve blockade may be combined with general anesthesia to provide long-lasting postoperative analgesia following a surgical procedure that may not be amenable to regional anesthesia alone (also see Chapter 40). A 2013 systematic review documented that, in a broad range of surgical procedures, use of local infiltration or peripheral nerve block in addition to general anesthesia improved postoperative pain scores and decreased opiate consumption. Even use of a peripheral nerve block in addition to a singleshot spinal block improves postoperative analgesia for many surgeries of the lower extremity. However, most of the studies reviewed were performed in the 1970s to 1990s, and management of cardiovascular disease has evolved significantly in subsequent decades. Induction of anesthesia can be accomplished via the inhaled or intravenous route of anesthetic administration. This provides a crucial margin of safety during periods of apnea or upper airway obstruction that can occur with induction of general anesthesia. Thus, adequate preoxygenation can delay or eliminate the onset of hypoxemia during the time period between the intravenous induction of anesthesia and the start of controlled ventilation. An inhaled induction of anesthesia is often chosen for pediatric patients in whom preinduction placement of an intravenous catheter is impractical (also see Chapter 34). Also, it may be indicated in the patient who is anticipated to have a difficult airway to manage, because spontaneous respiratory efforts are preserved with an inhaled induction of anesthesia. However, inhaled anesthetics ablate protective airway reflexes and pharyngeal muscular tone, so this method will not be suitable for all patients in whom difficulties with airway management are anticipated. Sevoflurane is the most commonly used anesthetic for inhaled induction of anesthesia because of its low pungency, high potency (permitting delivery of high-inspired oxygen concentration), and rapidity of onset. This involves filling the breathing circuit with 8% sevoflurane by emptying the reservoir bag, opening the adjustable pressure-limiting valve, and using a high fresh gas flow. This approach to inhaled induction of anesthesia can produce loss of consciousness within 1 minute. Intravenous induction of anesthesia is the most common technique in the adult patient. Pharmacologic options include propofol, thiopental, etomidate, ketamine, and a benzodiazepine-opioid combination (also see Chapters 8 and 9). The anesthesia provider may then choose to administer an inhaled anesthetic to increase the Does the procedure require general anesthesia Peripheral nerve block Neuraxial block Select depth of sedation (minimal, moderate, deep) based on patient and procedural factors. Postoperative Care Plan for postanesthesia recovery and disposition (outpatient, inpatient, intensive care) Consider regional technique for intraoperative and/or postoperative analgesia. If tracheal intubation is planned, a neuromuscular blocking drug is usually given to facilitate direct laryngoscopy (also see Chapter 11). The sequence of events involves (1) preoxygenation; (2) intravenous administration of a hypnotic. However, if the anesthesia provider anticipates difficulty with ventilation via a mask or tracheal intubation then tracheal intubation should be initiated prior to induction of anesthesia. After induction of anesthesia and appropriate airway management, anesthesia is maintained typically by administration of a combination of anesthetic drugs, each titrated to achieve the desired anesthetic goal while minimizing side effects. For example, although high concentrations of inhaled anesthetics can produce skeletal muscle relaxation, the risks of cardiac depression and vasodilation increase. Neuromuscular blocking drugs can facilitate surgical exposure once adequate hypnosis and analgesia are achieved. Thus, the anesthesia provider selects medications that target specific anesthetic requirements while minimizing the cumulative risk of undesired effects. Individual patients and particular surgical procedures may present special considerations that influence the choice of anesthesia maintenance strategy. Potent inhaled anesthetics (also see Chapter 7) represent the mainstay of drugs used to maintain anesthesia in most clinical situations. They are easily titratable, reduce the autonomic response to noxious stimulation, and at clinically relevant doses can often provide sufficient muscle relaxation to facilitate surgical exposure. Emergence from hypnosis provided by volatile anesthetics can be associated with airway hyperreactivity and coughing, although those side effects can be mitigated by coadministration of other drugs. Another inhaled anesthetic, nitrous oxide, can provide both hypnosis and analgesia at clinically relevant doses but cannot be used as a sole agent for general anesthesia because it but lacks the potency of the newer inhaled anesthetics. The minimum alveolar concentration required to prevent movement to surgical stimulation is greater than the concentration that can be delivered at atmospheric pressure, so it cannot be used alone to provide reliable hypnosis. Substitution of nitrous oxide for a portion of the inhaled anesthetic dose can reduce the cardiovascular effects observed with potent inhaled anesthetics while maintaining the same anesthetic depth. Nitrous oxide also provides analgesia and is rapidly titratable because of its low blood-gas partition coefficient. The concern that use of nitrous oxide may increase rates of perioperative cardiac complications after noncardiac surgery could not be documented in a large 2015 trial. Propofol reduces the incidence of postoperative nausea and vomiting and may have more favorable emergence characteristics with less coughing and laryngospasm risk compared to inhaled anesthetics alone. For certain surgical procedures, intravenous maintenance of anesthesia is most appropriate. For example, laryngeal surgery with intraoperative jet ventilation is accomplished without an endotracheal tube, making delivery of inhaled anesthetics difficult. Patients undergoing scoliosis surgery often require somatosensory and motor evoked potential monitoring. The inhaled anesthetics produce a decrease in amplitude and increase in latency of both somatosensory and motor evoked potential signals.

Although some have found that the cognitive side effects can be reduced following gradual titration (28) social anxiety symptoms yahoo cheap 100 mg desyrel mastercard, others have suggested that the presence of word finding difficulties appears to be a phenomenon independent from titration schedule and is a side effect that occurs in a subgroup of patients with a specific biological vulnerability (29) anxiety attack symptoms yahoo answers discount desyrel 100 mg without prescription. Fortunately anxiety symptoms but dont feel anxious purchase desyrel 100 mg with mastercard, the cognitive difficulties associated with topiramate appear to be reversed following discontinuation of the drug (30) anxiety 7 year old boy buy 100 mg desyrel visa. Although epilepsy surgery can be associated with postoperative decline in memory function anxiety symptoms yahoo 100 mg desyrel free shipping, individual postoperative trajectories can differ significantly. Whilst approximately one-third of patients may experience a significant decline in memory function following a unilateral temporal lobe resection, memory functions for the majority may remain unchanged and can actually improve in approximately 20% of some surgical series (31). Postoperative change is governed by a variety of pre-, peri-, and postoperative factors. Preoperative risk factors for postoperative decline in memory function include good preoperative function and surgery on the language dominant hemisphere. Although the role of Neuropsychological rehabilitation A neuropsychological assessment forms the basis for all rehabilitation efforts for cognitive problems in epilepsy. For memory difficulties these may include teaching the patient strategies that help them to process new information in greater depth, in a variety of ways. Mnemonic strategies may be useful for people with epilepsy but generalization of this technique to everyday situations outside the clinic is usually modest or even absent. Another common strategy is the method of loci, where lists of items are recalled via visual imagery, the more bizarre imagery the better. The patients with a left temporal seizure onset (who had the poorest memory performance in a didactic control condition) benefited the most from the self-generation condition. In postoperative patients it appears that patients who have undergone a left temporal lobectomy and who are in the greatest need of rehabilitation benefit less from rehabilitation strategies than those with more residual function remaining following surgery (43). Memory strategies can be very time consuming to master and require a high level of motivation from the patient for any real level of success. Wider cognitive deficits may mean it is not easy for some to employ visual imagery. As a result, many patients find these methods difficult to adopt and apply effectively in their everyday lives. These can range from simple techniques to ease the nuisance of everyday memory difficulties to more complex interventions to reduce the impact of impulsive or disinhibited behaviours associated with frontal lobe dysfunction. These environmental adaptations often involve the development of routines that need to become second nature to ensure success. The planning of these strategies relies heavily on finding the appropriate external prompt to shore up the failing internal cognitive functions. Each neuropsychological rehabilitation package will be unique to the individual and will be drawn up on the basis of the results from a detailed clinical interview and a formal neuropsychological assessment. Relatives and work colleagues may also need to be actively involved in some rehabilitation strategies, particularly where frontal lobe functions are compromised. Acceptance of cognitive difficulties as an integral part of having epilepsy is a fundamental adjustment that many patients with epilepsy must make. Many have never been explicitly told this and they continue to strive for a remedy many years after diagnosis. Many of the factors that underpin cognitive difficulties in epilepsy are fixed and cannot be changed. Memory functions will not get better, although neuropsychological rehabilitation can help to develop ways around the nuisance of frequent memory failures. An early explanation that cognitive difficulties are an integral part of the condition can help the long-term adjustment to living with epilepsy. The third approach to neuropsychological rehabilitation may employ a cognitive behavioural or psychotherapeutic approach to help the patient work through the issues of loss that are inevitably associated with the development of this acceptance. Self-reported memory problems in everyday activities in patients with epilepsy treated with antiepileptic drugs. Defining meaningful postoperative change in epilepsy surgery patients: measuring the unmeasurable Differential contributions of objective memory and mood to subjective memory complaints in refractory focal epilepsy. Memory complaints in epilepsy: an accurate reflection of memory impairment or an indicator of poor adjustment Recent insights into the impairment of memory in epilepsy: transient epileptic amnesia, accelerated long-term forgetting and remote memory impairment. Co-occurrence of major depression or suicide attempt with migraine with aura and risk for unprovoked seizure. Patients with epilepsy: cognitively compromised before the start of antiepileptic drug treatment Beyond localization: the role of traditional neuropsychological tests in an age of imaging. Sex differences in face recognition memory in patients with temporal lobe epilepsy, patients with generalized epilepsy, and healthy controls. Cognitive consequences of childhood-onset temporal lobe epilepsy across the adult lifespan. Chronic temporal lobe epilepsy: a neurodevelopmental or progressively dementing disease The influence of antiepileptic drugs on cognition: a comparison of levetiracetam with topiramate. Significant improvement in frontal lobe associated neuropsychological functions after withdrawal of topiramate in epilepsy patients. Improvements in memory function following anterior temporal lobe resection for epilepsy. Cognitive outcome 10 years after temporal lobe epilepsy surgery: a prospective controlled study. Serial cognitive change patterns across time after temporal lobe resection for epilepsy. Persistent severe amnesia due to seizure recurrence after unilateral temporal lobectomy. The use of self-generation procedures facilitates verbal memory in individuals with seizure disorders. The effects of cognitive rehabilitation on memory outcome after temporal lobe epilepsy surgery. Automatism is sometimes claimed as a defence for criminal actions occurring while a person is suffering a seizure. Potentially dangerous or criminal behaviour may be exhibited by patients with epilepsy but may not necessarily be associated with epilepsy per se. Violent and aggressive behaviour may be interictal and unrelated to a seizure although underlying psychiatric conditions or brain injury may be common to both. True ictal violence may be attributed to automatisms associated with complex partial seizures, myoclonic seizures, and similar types of epilepsy but this occurs without purpose or conscious control. Actions may appear to be destructive, violent, or aggressive but they are not directed and are not modified to suit the circumstances. In the postictal state a person may be psychotic, delirious, disorientated, and confused. Actions may seem purposeful but they are based on an altered sensorium with impaired cognition and decision-making ability. An example of this might be resisting or lashing out at someone trying to restrain or assist the delirious person. In cases where epileptic automatism is claimed as a defence it is necessary to prove the person was actually having a seizure and was ictal or postictal at the time of the incident. The seizure must occur suddenly and there must be demonstrable impaired consciousness. Alternatively it should be demonstrated that the behaviour in question was characteristic of a typical seizure for that person. In the majority of these cases there were associated factors such as intoxications and psychiatric comorbidities that could not be excluded as contributing factors (4). Epilepsy and driving Epilepsy is probably the most common neurological disorder seen in the general community and all general practitioners and neurologists will have patients with a history of seizures and who are taking anticonvulsant medication. Epilepsy has the potential to cause a wide range of episodic disability from minor disturbances of perception or movement to complete loss of consciousness and this may result in adverse events associated with complex or dangerous activities including driving. Behaviour and events associated with seizures or postictal states may be of major medico-legal significance. Even though drug treatment of epilepsy has the potential to produce side effects that affect behaviour or driving ability, in practice it is the risk of a seizure that is the defining criterion for holding a licence (5). Despite this, the relative risk of crashes attributed to fitting drivers is low (6), possibly because of medical management of epileptic patients and consequent advice regarding licensing. The relative risk of a crash in drivers with known epilepsy is usually quoted as less than 2 which must be put into the context of, for instance, the much higher relative risk associated with alcohol and drug use, and the increased crash risk of healthy drivers between the ages of 18 and 25 compared to middle-aged experienced drivers. Many other medical conditions are related to similar degrees of crash risk as epilepsy, but this is not always recognized in a consistent manner in various fitness to drive regulations. There are also significant differences in crash risk between drivers with epilepsy under treatment or advice (who have a very low relative risk) and the epilepsy population as a whole where the risk of a crash is increased by 40­100% (8). This probably represents the difference in severity of the condition between epilepsy patients who can obtain a licence and those who cannot satisfy the authorities that they are fit to drive (9). As epilepsy is a condition that relies on historical details for clinical decision-making, it is perhaps not surprising that there is a perception that many drivers with epilepsy do not tell their doctors the truth (10). Social and work pressures are often cited as reasons why poorly controlled patients continue to drive (11, 12). This probably reflects the inclusion of seizures without loss of consciousness in studies, or the perception of an imminent seizure allowing the driver to pull over. It may also represent interictal events which have a minor and subtle effect on consciousness and performance (13). However, it may also be a fortuitous finding due more to luck and the real risk is potentially much higher (14). There are many different types of epilepsies which may differ in some respects in their potential effect on licensing policy although they have a common thread of paroxysmal gross impairment separated by periods of relative normality. Complex partial and generalized tonic­clonic seizures (primary or secondary) are the types most commonly associated with crashes (14). These are completely incapacitating during the ictal phase and are associated with a variable postictal period where the driver may remain incapacitated despite a partial return of consciousness. Involuntary motor movements during partial seizures have also been noted to contribute to crashes. Other forms are less commonly causes of crashes, with simple partial or uncomplicated myoclonic seizures where consciousness is preserved being rarely involved. Licensing guidelines for patients with epilepsy therefore may require identification of a specific epilepsy syndrome and monitoring of treatment. Because the oversight of epilepsy by clinicians rests largely on evidence from the patient regarding the frequency of seizures, it is important for doctors to assess the reliability of the history. It is important to differentiate between the risk of having a seizure (whether behind the wheel or not) and the risk of having a crash. This is especially problematic as most licensing guidelines specify a fixed fit-free period and recording of this historical data is likely to be adversely affected by bias in histories given to clinicians (17). Objective evidence of seizure frequency and type may come from police reports, hospital records, or observations made during admissions for monitoring. When a person is actually suffering a seizure, they are unconscious and technically incapable of controlling a motor vehicle. This has implications for criminal proceedings where it is necessary to prove intent or negligence for certain acts such as culpable driving, vehicular homicide, or similar offences. If a person is incapacitated by a seizure or a postictal state it can be argued that they were not actually in control of the vehicle or responsible for their actions. Arguments can be made that negligence extends to driving with untreated or inadequately treated epilepsy or after a negligent decision not to inform a doctor or to drive against medical advice. A number of legal cases have explored this issue with varying outcomes, not always consistent with each other (19). Another important medico-legal issue is the estimation of risk of seizure recurrence in patients who have ceased anticonvulsant medication. There are many variables here, including the type of epilepsy and the indications for ceasing treatment (20). Patients with generalized tonic­clonic seizures and those on multiple drug therapy present the greatest risk of seizure recurrence. Studies have shown variable periods of increased risk in patients withdrawn from medication with increased risk in some cases persisting for long periods. Patients recommenced on treatment after a recurrent seizure have an increased risk over the next 12 months compared to patients started on treatment, probably reflecting the increased severity of epilepsy which has recurred after treatment withdrawal (21). However, there are unpredictable variables introduced because of uncertainties in following-up patients remaining on treatment. The most significant factor in assessing risk is the time since the last seizure rather than the time off medication. Therapeutic measures in epilepsy cases may also have a bearing on fitness to drive even though seizures are controlled. Visual field defects resulting from epilepsy surgery or treatment with certain drugs such as vigabatrin may be severe enough to render a person unfit to drive (22). Many anticonvulsant drugs have undesirable side effects such as sedation, confusion, incoordination, or other psychomotor effects that can affect driving ability. In most cases these are either transient, due to wrong dosing or may be avoided with a change of medication. It is important to keep these effects in mind when treating patients with epilepsy. In some jurisdictions reporting is compulsory, which makes the decision easy, but there may be an adverse impact on the doctor­patient relationship and the reliability of the history of seizure control. This aspect of licensing policy involves a breach of confidentiality and raises ethical and medico-legal questions which have been debated vociferously in the literature (23­25). In some jurisdictions doctors are protected from litigation by the driver if it can be shown that they acted in good faith when reporting. Regardless of whether reporting is compulsory, it is always good practice to discuss the situation fully with the patient and attempt to explain the reasons why they should not be driving.

Depletion of calcium in the synaptic cleft of a calyx-type synapse in the rat brainstem anxiety 9 to 5 desyrel 100 mg purchase otc. Electrophysiological characteristics of reactive astrocytes in experimental cortical dysplasia anxiety symptoms blurred vision order generic desyrel from india. Effects of general anesthetics on intercellular communications mediated by gap junctions between astrocytes in primary culture social anxiety symptoms quiz buy line desyrel. Glutamate induces calcium waves in cultured astrocytes: long-range glial signaling anxiety 4th 9904 purchase desyrel with visa. Intracellular calcium oscillations in astrocytes: a highly plastic anxiety symptoms constipation cheap desyrel line, bidirectional form of communication between neurons and astrocytes in situ. Lasting blood-brain barrier disruption induces epileptic focus in the rat somatosensory cortex. Generalized epilepsy: some of its cellular mechanisms differ from those of focal epilepsy. Intracellular recordings in thalamic neurones during spontaneous spike and wave discharges in rats with absence epilepsy. Symptomatic epilepsies are caused by an obvious brain abnormality, which can in turn be genetically determined or by external factors acting prenatally or after birth. The same applies to many forms of progressive myoclonus epilepsy, whose clinical expression is relatively homogeneous in relation to the genetically determined degenerative or metabolic causes. The task is much more complex when the genetic cause is hidden and will only be recognizable or hypothesizable later during the course, when a given electroclinical pattern or syndrome will become obvious. Genetic research in epilepsy represents an area of great interest for both clinical purposes and for understanding of the mechanisms underlying epilepsy. In the past, genetic studies on families and twins contributed to the definition of genetic epilepsy, and especially to the evaluation of the risk of familial occurrence. After the first report in 1988 of the chromosomal mapping of juvenile myoclonic epilepsy (1), several additional loci were demonstrated to be implicated in syndromic epilepsies. In 1995, the first mutation in the gene coding for the nicotinic acetylcholine receptor was identified in a family with autosomal dominant nocturnal frontal lobe epilepsy (2). The subsequent identification of new epilepsy genes has greatly improved our understanding of the pathophysiological mechanisms underlying epilepsy and has favoured research into experimental models and new therapeutic strategies. However, ethical problems may arise especially in asymptomatic mutation carriers or in individuals and families in which although mutations of specific genes have been identified, severity of the associated phenotype is unpredictable. Genetic epilepsy syndromes without structural brain abnormalities About 30% of all epilepsies are idiopathic (3). The idiopathic epilepsies are characterized by age-related onset, normal neurological and cognitive development, and absence of brain damage. Even in families where involvement of a single gene is suspected, a high degree of complexity can actually be present. The phenotypic variability in some families has been ascribed to genetic modifiers (polymorphisms) or environmental factors that influence phenotypic expression (4). The genetic alterations identified so far are responsible for rare forms of idiopathic epilepsies with a dominant pattern of inheritance, which occur with repeated seizures in the neonatal or early infantile period, and with febrile, generalized, or partial seizures that persist into adulthood. These forms are observed in a limited number of patients, but they are of great interest as they are caused by alterations in genes that encode voltage-gated ion channel subunits or receptor subunits. For the most common forms of idiopathic epilepsy, however, the molecular bases have not yet been defined; it is possible that different mutations can cause similar phenotypes in different families or in patients from different geographical areas (Table 2. Development in the first year of life is normal but subsequently slows and may regress. The majority of patients exhibiting mutations of this gene carry de novo mutations (90%); about 40% of these mutations are truncation and 40% are missense mutations. Germline mosaicism may result in siblings with Dravet syndrome born from an unaffected or mildly unaffected parent carrying a low level of mosaicism for the mutation (12, 13). Mutations are less commonly found in patients that have been categorized within different subgroups exhibiting various elements of Dravet syndrome (15­17). Hence, these mutations reduce the main mechanism for neuronal inhibition in the brain, which can explain the occurrence of seizures. These forms are quite rare and are transmitted with an autosomal dominant pattern of inheritance. Molecular diagnosis, where possible, is important in order to avoid unnecessary invasive testing and support genetic counselling. The clinical manifestations of these forms of epilepsy are rather similar, while age of onset is variable. It is likely that most cases, however, occur in small families or are sporadic (18). In vitro functional studies have shown that mutations in the gene that encode the alpha 1 subunit determine a persistent depolarization of the Na+ current resulting in neuronal hyperexcitability (24). Seizures have a focal onset, often with hemitonic or hemiclonic symptoms or with apnoeic spells, or can clinically appear as generalized. Although psychomotor development is usually normal, an increasing number of cases with learning disability have recently been described (29). Although the reduction of the potassium current can cause epileptic seizures by a subthreshold membrane depolarization, which increases neuronal firing, it is not fully understood why seizures preferentially occur in neonates (36). The S5 and S6 segments and the linkers form the pore that acts as ion selectivity filter. These receptors are heteropentamers consisting of various combinations of subunits. The alpha4-beta2 combination is the most represented in the thalamus and cerebral cortex. All the identified mutations reside in the pore-forming M2 transmembrane segments. The exact pathomechanism is not fully understood, but an increased acetylcholine sensitivity could be the main common gating defect of the mutations. However, age at onset of seizures ranges from the neonatal period to infancy in different family members, with a mean onset age of 3 months. Linkage studies have identified two loci for this type of epilepsy, one in the pericentromeric region of chromosome 16 and another on chromosome 19 (41, 42). Some families also have paroxysmal dyskinesia beginning in later childhood (infantile convulsions and choreoathetosis) (41). The differential diagnosis includes seizures with fever in a child with epilepsy, seizures with central nervous system infection, or an acute metabolic disturbance (60). A positive family history is one of the few known risk factors for febrile seizures, with recurrence risk ratios of 3­5 in first-degree relatives (61). Patients often have severe epilepsy with early onset and infantile spasms, delayed neurological and cognitive development, and behavioural problems. Some examples of genes in which, in recent years, mutations have been identified in patients with particular forms of severe epilepsy are discussed in this section. B) Nicotinic receptors are formed by five subunits (pentamers), symmetrically arranged to delimit a pore through which cations flow, with Na + and Ca 2+ incoming, and K+ outgoing. Nine different types of -subunits and four different types of -subunits are known. In the central nervous system, the pentameric structures of the receptor are composed of -subunit homodimers or of -subunits/ -subunits combinations. Abnormalities in this receptor, caused by mutations of its subunits, cause nocturnal frontal lobe epilepsy. It is characterized by a variable clinical presentation, including slow development from birth, normal early development followed by regression starting at seizure onset, and normal development without regression (65, 67). Protocadherin 19 is part of the protocadherin delta-2 subclass of the cadherin superfamily. Protocadherin members are expressed predominantly in the nervous system, where they have a role in establishing neuronal connections and in signal transduction at synaptic membranes (65). Cellular interference has been proposed to explain the discrepancy between the clinical 16 oxford textbook of epilepsy and epileptic seizures manifestations of heterozygous females and hemizygous males (68). This model suggests that if an individual has two populations of protocadherin cells (mutated and non-mutated) then a pathological phenotype occurs. A normal female or a transmitting male have only one protocadherin population of cells, protocadherinwildtype or protocadherin-mutant cells, respectively, then they do not present a pathological phenotype. The development of genetically modified animal models will allow this puzzling disease mechanism to be better explored. However, larger series are needed to fully elucidate the phenotypic spectrum and better understand the causative role of this gene in epilepsy. In affected females, a seemingly normal early development, followed by onset of intractable seizures between the first days and 4th month of life are early key diagnostic criteria. Seizures are usually manifested as infantile spasms, or prolonged tonic seizures followed by spasms and myoclonus, with a peculiar electroclinical pattern (84) variably associated with, migrating focal seizures during the course. Progressive mental deterioration, cerebellar and extrapyramidal signs are also present in a variable proportion of patients (91, 92). The age onset, the rapid progression of the symptoms, and the prognosis are different and depend on the specific aetiology and on the type of causative mutations. While the Unverricht­Lundborg disease, although disabling, can reach a degree of stabilization, all other forms progress relentlessly, leading to severe disability or death in matter of years. There is a partial overlap in age of onset, type, and frequency of seizures, prognosis, and response to treatment. Higher risk is seen in siblings and offspring, and is lower in second-degree relatives. In contrast to monogenic inheritance, polygenic inheritance leads to a more rapid decrease of the risk in relatives as the distance from the affected individuals increases (95). It has been suggested that they might result from the interaction of two or more genes (97). However a high degree of complexity is operating as large-scale exome sequencing of ion channels reveals that rare missense variation in known Mendelian disease genes are equally prevalent in healthy individuals and in those with idiopathic generalized epilepsy, revealing that even deleterious ion channel mutations confer an uncertain risk to an individual depending on the other variants with which they are combined (98). About 50% of patients with epilepsy have focal seizures, and the remaining 50% have generalized epilepsy, often within the spectrum of Lennox­Gastaut syndrome (109). Symptomatic epilepsy Epilepsies are defined symptomatic when an external cause can be identified. They occur as isolated manifestations or may be one expression of neurocutaneous diseases, vascular malformations, structural abnormalities associated with chromosomal disorders (Down syndrome, Angelman and Prader­Willi syndromes, Ring 20 syndrome, Wolff­Hirschhorn syndrome and many pathogenic copy number variations), mitochondrial encephalomyopathies, the organic acidurias, and the peroxisomal diseases. However, even a relatively late onset of seizures (2nd to 3rd decade of life) may occur when a discrete developmental abnormality of the brain is the cause of seizures. Malformations of the cerebral cortex It has been estimated that at least 40% of children with drugresistant epilepsy have a malformation of the cerebral cortex (109). These malformations consist of an abnormal distribution, organization, or sometimes differentiation of the neuronal components (110). Several cortical malformations associated with epilepsy are caused by alterations that occur during embryonic development, especially during the migration of neurons to form the cerebral cortex in its definitive shape. In recent years, several genes have been identified that, when mutated, cause abnormalities of cortical development. In the following sections, the most frequent cortical malformations associated with epilepsy (lissencephaly, periventricular heterotopia, and polymicrogyria) and those whose disease genes have been identified will be presented (Table 2. The sylvian fissures are open and the perisylvian cortex is thickened and irregular (black arrows). Note the abnormally vertical orientation of the sylvian fissure, which appears to be fused with the rolandic fissure. The cortical mantle is diffusely polymicrogyric, with prominent infoldings in the posterior aspect of the abnormally oriented sylvian fissures, more on the left. Mild missense mutations or mosaic mutations account for survival of affected males, who can, in turn, pass their genetic defect to their daughters. In newborns and young infants, the malformed cortex is very thin with multiple, very small undulations. Polymicrogyria is associated with a wide number of patterns and syndromes and with mutations in several genes (Table 2. It is associated with mild to moderate mental retardation, epilepsy, and impaired oromotor skills. Generalized spike-and-wave discharges and a combination of absence, myoclonic, and tonic­clonic seizures have been reported (142). Chromosomal abnormalities Chromosomal abnormalities are relatively common genetically determined conditions that increase the risk of epilepsy. Epilepsy has been associated with over 400 different chromosomal imbalances (147, 148). Among patients with epilepsy and intellectual disability, about 6% have chromosomal abnormalities, but this figure climbs to 50% if multiple congenital abnormalities are also present (147). However, the likelihood of developing seizures varies greatly among the different chromosomal disorders. Chromosomal abnormalities almost constantly result from rearrangements or deletions/duplications that affect the function of more than one gene. Most often cognitive impairment and dysmorphic features, even subtle, co-occur with epilepsy. The ring chromosome 20 syndrome represents the most striking example in which a highly specific epilepsy phenotype can be, at least in some patients, the only expression of the chromosomal disorder. However, at the research level on the causes of epilepsy, the association between cryptic deletions/duplications and epilepsy is improving our ability to clone new critical genes, translating in turn in improved diagnosis. However, little information is available on genome-wide cytogenetic array screening in patients specifically selected for epilepsy. Metabolic disorders Epilepsy is part of the clinical spectrum of a large number of inherited metabolic disorders (136, 137), often within the context of a complex neurological syndrome. Sometimes epilepsy is a prominent, or presenting, symptom, and, in a minority of patients can be cured by an appropriate dietary supplementation or regimen. Clinical features classically comprise a combination of infantile-onset seizures, complex movement disorders, 22 oxford textbook of epilepsy and epileptic seizures Genetic counselling Genetic testing can be offered for single-gene or Mendelian epilepsy syndromes, or epilepsy-associated disorders, if the gene has been identified. If not, empirical counselling can be offered, based on the type of epilepsy, mode of inheritance, and penetrance. Although we can now carry out preclinical and prenatal diagnosis in many cases, the severity and prognosis of the epilepsy in specific individuals, particularly in those with idiopathic epilepsies, is difficult to predict.

Syndromes

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It rises again in late adolescence and early adulthood before levelling off throughout most of adult life anxiety ulcer discount desyrel 100 mg with amex. Death in people with epilepsy can be classified into three groups: epilepsy-related deaths anxiety 10 months postpartum desyrel 100 mg order free shipping, deaths related to the underlying cause of the epilepsy anxiety 40 weeks pregnant buy desyrel in india, and deaths that are unrelated to the epilepsy or its underlying aetiology (Table 5 anxiety symptoms in adults buy discount desyrel 100 mg. The incidence of death for young adults with intractable epilepsy is many times that of the general population anxiety symptoms purchase desyrel with amex, with a peak between the ages of 20­40 years (87). People with epilepsy may sustain a fatal accident either during a seizure or as a consequence of a seizure. Based on attendance records of 4 accident and emergency departments, the risk of injury as a result of a seizure was estimated to be 29. Batten disease Epilepsy-related deaths Suicides Treatment-related deaths Idiosyncratic drug reactions Medication adverse effects Seizure-related deaths Status epilepticus Trauma, burns, drowning Asphyxiation, aspiration Aspiration pneumonia after a seizure Sudden unexpected death in epilepsy From Nashef and Shorvon (84). Besides developing countries, spontaneous remission of epilepsy has also been observed in developed countries. In a Finnish study, it was found that 42% of 33 untreated epilepsy patients entered a 2-year remission within 10 years after onset (114). Prognosis of intractable epilepsy Only 5­10% of all incidence cases of epilepsy ultimately result in truly intractable disease. Approximately 60% of patients with intractable epilepsy can be expected to suffer from partial seizures. Recent studies reported that approximately 5% per year of patients with intractable epilepsy were seizure free for 12 months following medication changes. Prognosis of epilepsy Remission of treated epilepsy Given that in developed countries antiepileptic medication is usually commenced after two unprovoked seizures, prognostic studies from Western countries are essentially those of treated epilepsy. The probability of being in remission for 5 years at 20 years after diagnosis (terminal remission) was 75% (107). Other modern large-scale studies that include only newly diagnosed patients followed for long periods also tend to suggest a remission rate of 60­90% (110). At a conservative estimate, at least 60% of newly diagnosed patients will enter long-term remission on treatment initiation, and approximately 50% of these patients will remain in remission after antiepileptic medication withdrawal. Commission on Epidemiology and Prognosis of the International League Against Epilepsy. Prevalence of neurological disorders in Udo, a rural community in southern Nigeria. Active convulsive epilepsy in a rural district of Kenya: a study of prevalence and possible risk factors. Prevalence and incidence of epilepsy in Ulanga, a rural Tanzanian district: a community-based study. The similar prevalence rates in resource-poor and developed nations may reflect the occurrence of spontaneous remission of many of the untreated cases. Epilepsy, cysticercosis, and toxocariasis: a population-based case-control study in rural Bolivia. Revised terminology and concepts for organization of the epilepsies: Report of the Commission on Classification and Terminology. Systematic review and metaanalysis of incidence studies of epilepsy and unprovoked seizures. Socioeconomic variation in incidence of epilepsy: prospective community based study in south east England. Differences in the use of health services among people with and without epilepsy in the United Kingdom: socio-economic and disease-specific determinants. Socioeconomic prognosis after a newly diagnosed unprovoked epileptic seizure in adults: a population-based case-control study. The socioeconomic, cultural, and emotional implications of starting or withholding treatment in a patient with a first seizure. Estimating the incidence of first unprovoked seizure and newly diagnosed epilepsy in the low-income urban community of Northern Manhattan, New York City. The Yelandur study: a community-based approach to epilepsy in rural South India-epidemiological aspects. Epileptic seizures in an Andean region of Ecuador: incidence and prevalence and regional variation. Prevalence and clinical features of epilepsy in a biracial United States population. Pilot study to detect neurologic disease in Ecuador among a population with a high prevalence of endemic goiter. Comparative epidemiology of epilepsy in Pakistan and Turkey: population-based studies using identical protocols. Mortality in epilepsy in the first 11 to 14 years after diagnosis: multivariate analysis of a long-term, prospective, population-based cohort. Methodologic issues in studies of mortality following epilepsy: measures, types of studies, sources of cases, cohort effects, and competing risks. Mortality risk in an adult cohort with a newly diagnosed unprovoked epileptic seizure: a populationbased study. Causespecific mortality in epilepsy: a cohort study of more than 9,000 patients once hospitalized for epilepsy. Mortality in patients with epilepsy: 40 years of follow-up in a Dutch cohort study. Incidence of sudden unexpected death in an adult outpatient cohort with epilepsy at a tertiary referral centre. Epilepsy in young people: 23 year followup of the British national child development study. Prospective population-based study of intermittent and continuous convusive status epilepticus in Richmond, Virginia. Incidence of status epilepticus in adults in Germany: a prospective, population-based study. Complex partial status epilepticus accompanied by serious morbidity and mortality. Cancer mortality amongst people with epilepsy: a study of two cohorts with severe and presumed milder epilepsy. Remission of epilepsy: results from the National General Practice Study of Epilepsy. The characteristics of epilepsy in a largely untreated population in rural Ecuador. Prevalence, incidence, and etiology of epilepsies in rural Honduras: the Salama Study. The prevalence of epilepsy and other seizure disorders in an Arab population: a community-based study. Research protocol for measuring the prevalence of neurologic disorders in developing countries: results of a pilot study in Nigeria. Tekle-Haimanot R, Forsgren L, Abebe M, Gebre-Mariam A, Heijbel J, Holmgren G, et al. Clinical and electroencephalographic characteristics of epilepsy in rural Ethiopia: a community-based study. The prevalence of epilepsy follows the distribution of onchocerciasis in a west Ugandan focus. Prevalence of active epilepsy in a rural area in South Tanzania: a door-to-door survey. Despite this multifactorial nature of causation, cases can be classified according to the predominant cause (or presumed cause) into four categories (1): 1. Defined as: epilepsy of predominately genetic origin and in which there is no gross neuroanatomical or neuropathological abnormality. More common are epilepsies with presumed polygenic or complex inheritance but the nature of the genetic mechanisms has remained elusive. The term idiopathic is preferred as the production of the epilepsy is a complex mix of likely genetic and non-genetic mechanisms, and includes epigenetic and epistatic mechanisms, with chance and environmental influences operating over time as the brain develops. Defined as: epilepsy, of an acquired or genetic cause, associated with neuroanatomical or neuropathological abnormalities indicative of an underlying disease or condition. This category includes both (a) acquired conditions and also (b) developmental and congenital disorders where these are associated with cerebral pathological changes, whether genetic or acquired (or indeed cryptogenic) in origin. Defined as: epilepsy in which a specific systemic or environmental factor is the predominant cause of the seizures and in which there are no gross causative neuroanatomical or neuropathological changes. The reflex epilepsies are included in this category (which are usually genetic) as well as the epilepsies with a marked seizure precipitant. Defined as: epilepsy of presumed symptomatic nature in which the cause has not been identified. The number of such cases is diminishing, but currently this is still an important category, accounting for at least 40% of adult-onset cases of epilepsy. It is important to note that these categories do not map easily to focal/generalized groupings, and some symptomatic epilepsies are generalized and some idiopathic epilepsies are focal. Both approaches would be valid, and it is likely that many downstream causes converge on a final common pathway of epileptogenesis. It is also clear that the mechanisms underpinning idiopathic, symptomatic, and provoked epilepsy are quite distinct. Bearing these issues in mind, a list of aetiologies divided into the four categories is presented in Table 6. Idiopathic epilepsy As Hippocrates realized, 2000 years ago, inheritance is very important as a cause of epilepsy. With the recent discoveries of molecular genetics and the unravelling of the human genome, genetics is again the focus of much interest (2). Interestingly, almost all of the genes identified are genes that code for ion channels (see Chapter 11, Table 11. It is notable that mutations in the same gene can cause different epilepsy syndromes (phenotypic heterogeneity) and the same syndrome can be caused by mutations in different genes (genotypic heterogeneity) and clearly even in these single-gene disorders, there are more complex polygenic or environmental influences (3, 4). However, these are an important category, accounting for at least 40% of epilepsies encountered in adult practice and a lesser proportion in paediatric practice. Both have been the subject of intensive genetic study, but to date no common susceptibility genes have been identified and the genetic mechanisms are obscure (5). The core clinical features are shared to a greater or lesser extent by these syndromes (at least those with onset in later childhood or early adult life) and are shown in Table 6. Other benign partial syndromes include childhood epilepsy with occipital paroxysms (benign occipital epilepsy; Gastaut type-idiopathic childhood occipital epilepsy) and early-onset benign occipital epilepsy (synonym: Panayiotopoulos syndrome). Symptomatic epilepsy of predominantly genetic or congenital causation Childhood epilepsy syndromes these have multiple causes and are included in this section for convenience as, although some causes are acquired, the majority are genetic or developmental in origin. West syndrome West syndrome is a severe epileptic encephalopathy, with an incidence of 1­2 per 4000 live births (9). Ninety per cent of cases develop in the first years of life and the peak age of onset is 4­6 months. A wide variety of conditions have been reported to cause this encephalopathy (Table 6. The most characteristic seizure type in this syndrome is the tonic seizure, and this is usually associated with atypical absence, myoclonic, tonic­clonic seizures, and later complex partial seizures. Whether this is a specific syndrome, or simply a reflection of severe epilepsy in childhood associated with learning disability is unclear. There are also overlap cases with other epilepsy syndromes, and Lennox­Gastaut syndrome can evolve from West syndrome or neonatal convulsions. The predominant clinical feature is the presence of severe myoclonic seizures which evolve progressively and which are associated with other features depending on the underlying cause. In most parts of the world there are six common underlying conditions: mitochondrial disorders, Unverricht­Lundborg disease, Epilepsy with myoclonic absences Childhood absence epilepsy (petit mal; pyknolepsy) Juvenile absence epilepsy Juvenile myoclonic epilepsy (impulsive petit mal) Epilepsy with grand mal seizures on awakening Absence epilepsy with peri-oral myoclonia Core clinical features Table 6. These conditions are rare, and progressive myoclonic epilepsies account for less than 1% of all referrals to tertiary epilepsy services. The investigations to elucidate their underlying causes are outlined in Chapter 11 (Table 11. Neurocutaneous disorders Epilepsy is a prominent feature of most of the neurocutaneous conditions. Tuberous sclerosis complex, Sturge­Weber syndrome, and neurofibromatosis (type 1) are the most commonly encountered. Rarer conditions include hypo-melanosis of Ito, epidermal naevus syndrome, hereditary haemorrhagic telangiectasia, Parry­ Romberg syndrome, midline linear naevus syndrome, incontinentia pigmenti, and Klippel­Trénaunay­Weber syndrome (11). The incidence may be as high as 1 in 5800 live births and there is a high spontaneous mutation rate (1 in 25,000). The manifestations of the condition are very variable, but epilepsy is present in 80%. It can take the form of neonatal seizures, West syndrome, Lennox­Gastaut syndrome, or as adult-onset partial or generalized seizures. Many different mutations have been reported in this large gene, and although the penetrance is essentially complete, the clinical manifestations are extremely variable. The clinical features include: six or more café au lait macules over 5 mm in greatest diameter in prepubertal individuals and over 15 mm in greatest diameter in postpubertal individual, two or more neurofibromas of any type or one plexiform neurofibroma, freckling in the axillary or inguinal regions, optic glioma, Lisch nodules (iris hamartomas), and bone lesion such as sphenoid dysplasia or thinning of the long bone cortex, and pseudarthrosis. Sturge­Weber syndrome this is the third neurocutaneous syndrome in which epilepsy is a prominent feature. The clinical features are a unilateral or bilateral port wine naevus, epilepsy, hemiparesis, mental impairment, and ocular signs (14). Seventy per cent of patients with Sturge­Weber syndrome develop seizures within the first year of life and almost all have developed epilepsy before the age of 4 years. Other single-gene disorders In addition to the conditions already mentioned, there are many other single-gene and chromosomal disorders in which epilepsy is part of the phenotype. Most are rare or very rare, manifest initially in childhood, and present for diagnosis to paediatric neurological services rather than to an epilepsy specialist, and in only a few of these conditions does the epilepsy have distinctive features or is a predominant or consistent feature. Almost all are associated with learning disabilities and other neurological features (the features of which vary with the specific condition) and epilepsy is only one symptom of a much broader clinical picture. Conditions in which epilepsy is a prominent feature include Angelman syndrome, Rett syndrome, lysosomal storage or transport disorders, peroxisomal, pyridoxine-dependent disorders, inherited disorders of cobalamin and folate metabolism, amino acid and organic acid disorders, neuroacanthocytosis, porphyrias, urea cycle disorders, and Wilson disease (see also Chapter 11). Angelman syndrome this condition, with a frequency of about 1 in every 10,000­20,000 births, accounts for about 6% of all those with mental retardation and epilepsy.

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