Nonfebrile seizures.

Abstract

Nonfebrile seizures occur in children of all ages and often pose a challenge to the pediatrician in terms of cause, management, and prognosis. The term “seizure” does not imply a diagnosis, but rather indicates a clinical event that reflects a time-related dysfunction of the central nervous system (CNS) and may signal a serious underlying abnormality;however, more often in children the term indicates a transient disturbance of brain function. The pediatrician’s role is to determine the cause of the seizure and to treat the condition, based on an understanding of its pathogenesis, impact on the child and family, and the long-term outlook of the condition.Seizures and epilepsy are not synonymous. A seizure(convulsion) is defined as a paroxysmal involuntary discharge of cortical neurons that may be manifested clinically by an impairment or loss of consciousness, abnormal motor activity, behavioral and emotional abnormalities, sensory disturbances, or autonomic dysfunction. Some seizures are characterized by abnormal movements without loss of consciousness. The term epilepsy refers to spontaneous recurrent seizures unrelated to fever. In other words, a patient who has a single nonfebrile seizure that does not recur over time would not merit the diagnosis of epilepsy. The ages of greatest risk for nonfebrile seizures are during infancy, childhood, and adolescence. The annual incidence rate from birth to 20 years of age is 0.56 per 1000; the cumulative risk of epilepsy during the first 2 decades of life is approximately 1%. The prevalence of epilepsy in the pediatric population is 4 to 6 cases per 1000 children.Some may ask why it is necessary to classify epilepsy if the treatment and prognosis are similar for all children. There are primarily two forms of epilepsy characterized by either generalized seizures or a focal onset, and generalized and focal seizures respond predictably to some classes of anticonvulsants and not to others. The clinical appearance of a seizure may not indicate clearly whether the origin of the epileptiform discharge is focal or generalized. For example, a child may present with repetitive episodes of staring and unresponsiveness. Is this a generalized absence or a complex partial seizure? The proper classification will dictate the appropriate anticonvulsant. Finally, accurate classification of epilepsy permits the pediatrician to discuss the prognosis of the condition with the child and family. Most likely the child who has absence epilepsy will become seizure-free and not require medication as a teenager; focal seizures do not have the same favorable outcome.The International Classification of Epileptic Seizures (ICES) was introduced in 1981 and is based primarily on the clinical description of the seizure and the associated changes on electroencephalogram (EEG). The majority of seizures can be classified according to the ICES nomenclature (Table 1). Simple partial seizures (SPS) are associated most commonly with asynchronous clonic or tonic motor movements such as forced deviation of the head and eyes to one side. An SPS typically is short-lived,rarely persisting longer than 10 to 20 seconds, and the child remains conscious and is able to verbalize throughout it. The EEG characteristically shows unilateral spikes or sharp waves in the anterior temporal region, but the discharges may be bilateral;occasionally a multifocal spike pattern is recorded.Complex partial seizures (CPS) initially may share the characteristic appearance of an SPS with or without an aura, followed by impairment of consciousness. Alternatively, CPS may begin with loss of consciousness. The average duration of a CPS is 1 to 2 minutes, which is significantly longer than an SPS or an absence seizure. Aura is common and signals the onset of a seizure in approximately 30% of children who have CPS,with the child complaining of epigastric discomfort, fear, or an unpleasant discharge may spread from a temporal lobe throughout the cortex, causing a generalized tonic-clonic convulsion (termed secondary generalization). The majority of children who have CPS have an abnormal EEG characterized by sharp waves or spike discharges in the anterior temporal or frontal lobe or by multifocal spikes. Partial seizures are the most common form of epilepsy in children.Simple (petit mal) absence seizures typically have their onset at 5 to 6 years of age and are characterized by brief (5 to 20 sec) lapses in consciousness, speech, or motor activity,sometimes associated with flickering of the eyelids. Absence seizures never are accompanied by an aura or a postictal period of drowsiness, but automatisms may be observed during the seizure. The automatisms usually consist of eye blinking or lip smacking. Hyperventilation for 3 to 4 minutes by the cooperative patient frequently induces a seizure. The EEG is characterized by 3 per second generalized spike and wave discharges that indicate a clinical seizure. In contrast, an atypical absence seizure is characterized by associated myoclonic movements of the face and body,sometimes leading to loss of body tone, which causes the child to fall. The EEG pattern commonly is associated with either 2 to 2.5 per second or 3.5 to 4.5 per second generalized spike and wave discharges.Myoclonic seizures may occur in isolation or in association with other types of epilepsy, including tonic-clonic convulsions. Myoclonic seizures are characterized by brief, often repetitive symmetric muscle contractions with loss of normal body tone. Atonic seizures are difficult to differentiate from myoclonic seizures; in many cases they represent a prolonged myoclonic seizure. Atonic seizures typically cause the child to fall because of the sudden loss of postural tone.Primary generalized tonic-clonic (formerly called grand mal) and tonic or clonic seizures are well known to most pediatricians. These seizures are characterized by sudden loss of consciousness and tonic-clonic, tonic, or clonic contractions. Tonic seizures are associated with intense muscle contraction and clonic seizures with rhythmic, usually symmetric jerking movements. The child may develop perioral cyanosis and lose bladder control. The seizure is followed by a 30 to 60 minute period of deep sleep and postictal headache.The major disadvantage of the ICES classification is its failure to recognize certain distinct epileptic syndromes that are age-related, are characterized by specific types of seizures, and have varying etiologies that differ significantly from causes of epilepsy in the adult patient population. A“syndromic” classification proposed in 1989 by the International League Against Epilepsy permits selection of an anticonvulsant that is most appropriate to treat the patient’s predominant seizure type. The primary drawback of this more sophisticated approach to diagnosis and treatment of a child’s epileptic syndrome is that at present, only approximately 50% of seizure disorders in children can be placed into a specific syndrome. For the purpose of this review, the clinical description,characteristic EEG patterns, treatment, and prognosis of five epileptic syndromes are outlined briefly in Table 2. These syndromes include infantile spasms, Lennox-Gastaut syndrome, Landau-Kleffner syndrome, benign childhood epi- lepsy with centrotemporal (rolandic) spikes, and juvenile myoclonic epilepsy (Janz syndrome).Despite the advent of molecular diagnosis and new neuroimaging techniques, the etiology of most seizures in children remains unknown. The acute onset of seizures may result from cerebral trauma(head injury), CNS infection (meningitis, encephalitis), cerebrovascular diseases (infarction, arteriovenous malformation, hemorrhage, venous thrombosis), toxins (lead), brain tumor (cerebral or extracerebral),specific epilepsy syndromes (Table 2), genetic/heredi-tary diseases (eg, Down syndrome, tuberous sclerosis), metabolic and systemic diseases (endocrine, renal), degenerative disorders (leukodystrophy), or hereditary malformations (eg, cortical dysplasia, lissencephaly).An increasing number of epilepsy syndromes have been identified that are the result of a genetic abnormality. To date, the chromosomal loci have been identified for seven epilepsy genes and three epilepsy syndromes, including benign familial neonatal convulsions (chromosomes 20q and 8q), fatal progressive myoclonic epilepsy or Unverricht-Lundborg disease (chromosome 21q), and juvenile myoclonic epilepsy (chromosome 6p). The gene locus on chromosome 6 also may be responsible for other types of generalize tonic-clonic seizures. Studies of large numbers of families that have other well-defined epilepsy syndromes likely will uncover additional epilepsy genes.The age of presentation often provides a clue to the possible cause of epilepsy. Hypoxic-ischemic encepha-lopathy is the most common cause of seizures in the newborn, which characteristically are apparent within the first 24 hours. Children who have neonatal seizures following a hypoxic-ischemic insult are at significant risk to continue to have seizures (ie, epilepsy). Pyridoxine dependency may be the cause of seizures that begin shortly after birth, especially if they are associated with signs of fetal distress and particularly when there is a history of seizures in utero. Metabolic encephalopathies typically are associated with seizures in the newborn and usually are unresponsive to conventional anticonvulsants. The infant who has a urea cycle abnormality or a disorder of amino acid metabolism such as nonketotic hyperglycinemia may appear normal at birth, but within a few days will lose interest in feeding and sucking, followed by lethargy proceeding to coma and seizures, which often are of the myoclonic variety. Disorders of mitochondria, such as Leigh disease and pyruvate dehydrogenase deficiency,often present during infancy with repetitive seizures. The anoxic and metabolic encephalopathies that are associated with seizures will not be discussed further; several excellent reviews are included in the reading list.With the advent of modern imaging technology, including magnetic resonance imaging (MRI), single photon emission computed tomography(SPECT), and positron emission tomography (PET), it has become evident that structural abnormalities of the brain and congenital disorders of neuronal migration play an important role in the causation of epilepsy. The migrational abnormality may be severe and generalized, as seen in the child who has lissencephaly, which is characterized by a smooth brain due to a lack of gyri and a structure equivalent to a 12-week fetus. On the other hand, discrete collections of aberrant neurons visible by MRI imaging may be the cause of focal epilepsy in an otherwise normal child. A small number of children who have generalized infantile spasms have been found by EEG, MRI,SPECT, and PET scanning to have focal nests of dislocated neurons. In these cases, surgical excision of the abnormal cortex may result in complete seizure control.There is strong evidence that simple febrile seizures are not a cause of epilepsy, but whether a prolonged febrile seizure, especially during infancy,may cause mesial temporal sclerosis, thereby producing epilepsy at a later age, is still controversial. The cause of epilepsy in a cognitively and neurologically normal child has not been well defined; additional studies in these children may uncover a genetic basis.A presumptive diagnosis of epilepsy generally is made from a history of spontaneous recurrent seizures and findings on the physical examination because it is unlikely that the child will have a seizure in the presence of the physician. In response to careful questioning, the parent usually can give a good account of the seizure and whether it is generalized or focal in onset. The child also should participate in history taking because the existence of aura, which signifies a focal onset, may not be known to the parents. Certain seizures, such as absence or pseudoseizures, may be provoked in the clinical setting by hyperventilation or the power of suggestion. If the history and description of seizures remain unclear, the parent can videotape seizures for later review by the pediatrician. Generally, if a diagnosis of epilepsy is in doubt following the examination and an EEG, it is in the child's best interest to watch and wait before initiating specific treatment. It is possible that a condition mimicking epilepsy will become apparent during the period of observation.A number of paroxysmal nonepileptic disorders share features with epilepsy and, therefore, may be misdiagnosed by the physician. None of these conditions responds to anticonvulsant drugs. Breath-holding spells are such an example. Unlike epilepsy, breath-holding spells always are provoked and stereotyped and often are predictable. The child is frightened or chastised or falls and bumps his or her head, which is followed immediately by a brief shrill cry, forced expiration, and sudden loss of consciousness. The child becomes cyanotic(occasionally pallid) and during the succeeding 30 to 60 seconds may have several generalized tonic-clonic movements before consciousness returns. The child is lethargic and sleepy for a brief period following the event. Gastroesophageal reflux may cause laryngospasm, bradycardia, and apneic episodes in an infant, which may be confused with a seizure disorder. Prompt management of the reflux usually brings the apnea under control.Benign paroxysmal vertigo(BPV) often is confused with epilepsy. BPV causes the normal toddler to stagger or fall suddenly and to become pale and frightened. Some children will vomit during the episode, and all children will become dysarthric and complain of vertigo if they are able to verbalize. About 25% of children will have nystagmus during the attack. Although episodes of BPV usually are brief, persisting for 1 to 2 minutes, they may recur repetitively throughout the day.Simple syncope (fainting) is common in the adolescent and adult but is unusual in a child younger than 10 years of age. Tilt-table testing is a useful method to distinguish simple syncope from a seizure when the diagnosis is uncertain.Two types of syncope or loss of consciousness that begin during childhood may be confused with epilepsy and pose a significant hazard to the child. Cough syncope often is associated with poorly controlled asthma. These children develop cough paroxysms a few hours after falling asleep. The paroxysms may be so prolonged and persistent that the child loses consciousness and control of the bladder sphincter. There often are generalized tonic-clonic movements during the period of unconsciousness. The child has no recollection of these events the following morning. The prolonged QT syndrome results from an abnormality of myocardial function due to a familial or acquired insult, which may result in ventricular arrhythmias leading to sudden death. Children who have the prolonged QT syndrome are especially prone to cardiac arrhythmias during exercise or periods of anxiety or fear. It is vital not to confuse this condition with simple syncope or epilepsy because genetic counseling, teaching the parents cardiopulmonary resuscitation, or introducing specific drug therapy aimed at preventing the arrhythmia (eg, beta blockers) may be life-saving.Night terrors are common,especially in boys 4 to 6 years of age,and sometimes may be confused with epilepsy. They typically develop during the early stages of sleep and are characterized by the sudden onset of crying or screaming,uncontrollable flailing of the extremities, unintelligible speech, dilated pupils, and drooling. A few minutes later the child returns to sleep and has no recollection of the event.The episodic dyscontrol syndrome (rage attacks) is a behavioral disorder observed primarily in boys ages 6 to 12 years. The rage attack always is provoked by a confrontation with a student, friend, or more likely a parent, usually the mother. Following the precipitating event,the child simply loses control,lashing out at the parent; scratching,biting, or physically injuring the person; and sometimes threatening the individual with a knife or weapon. There usually is profanity and verbal threats, but no loss of consciousness. At the conclusion of the episode, the child usually is remorseful. In my experience, the largest number of referrals are initiated by child psychiatrists who wish to exclude CPS as a possible etiology for the severe behavioral outbursts observed in these children.Masturbation may mimic a seizure disorder. This behavior is seen most frequently in 2- to 4-year-old girls. In the recumbent position, the child develops repetitive rhythmic copulatory movements accompanied by a staring appearance, perspiration,plethoric facies, and unresponsiveness to the parents’ or siblings’voices.Tics are involuntary, spasmodic,nonrhythmic, repetitive movements. Unlike seizures, tics are stereotypic movements, unassociated with impaired consciousness; at times they may be suppressed by the patient.Pseudoseizures commonly are misdiagnosed as epilepsy; at the time of referral, patients typically are receiving three or four anticonvulsants with poor seizure control. Pseudoseizures develop most often during the preadolescent or adolescent periods in patients who have a previous history of epilepsy. The seizures may seem very realistic but often are bizarre and characterized by peculiar extremity postures,frequent falling without injury, and various vocal utterances. A pseudoseizure rarely persists longer than 5 minutes, and tongue biting or perioral cyanosis are uncommon. Frequently the recovery is sudden compared with the typical postictal period associated with a generalized tonic-clonic seizure. Pseudoseizures rarely occur when the child is unattended and lack the typical neurologic findings observed during a seizure, such as unresponsive dilated pupils and extensor plantar responses. The eyelids may be closed firmly, and the patient resists eye opening by the examiner during a pseudoseizure. Because a significant number of children who have pseudoseizures also have epilepsy,the presence of epilepsy does not exclude the diagnosis. A useful rule of thumb is that urinary or fecal incontinence during the ictal event excludes the diagnosis of pseudoseizures. Adolescent girls subjected to incest or sexual abuse may present with pseudoseizures. The pediatrician must consider initiating a comprehensive evaluation to exclude sexual abuse for all adolescent girls who have pseudoseizures.The EEG is a useful adjunct to the history and physical examination in establishing the diagnosis of epilepsy, but a routine interictal(between seizures) EEG will show an epileptiform abnormality in only approximately 60% of patients. EEG abnormalities are more likely to be recorded in the infant or child who has epilepsy than in the adolescent or adult who has epilepsy. Various procedures are employed during the EEG in an attempt to activate a seizure discharge in a child suspected of having epilepsy, including eye closure, hyperventilation, photic stimulation, and in specific circumstances, sleep deprivation and special electrode placement (eg,zygomatic leads). Prolonged EEG monitoring with simultaneous closed-circuit video recording is used in specific circumstances. For example, prolonged recording is useful for identifying ictal seizures that rarely are captured during routine EEG testing. Furthermore,prolonged EEG recording is particularly helpful in determining the location and frequency of seizure discharges while simultaneously visualizing and recording changes in levels of consciousness and the presence of clinical signs, which is critical for proper classification of the seizure disorder. Detailed localization and frequency of the seizure focus is essential for choosing appropriate candidates for epilepsy surgery. Finally, prolonged EEG recording is the “gold standard” test for investigating a patient who has suspected pseudoseizures.Unfortunately, the routine EEG often is not used appropriately. It cannot be used reliably to determine the appropriate duration of anticonvulsant therapy or to explain a lack of response to therapy. The EEG does provide essential information in at least four situations: to support a clinical diagnosis by typical EEG changes during the recording(eg, benign childhood epilepsy with centrotemporal spikes or absence epilepsy); to differentiate seizure disorders with similar clinical characteristics (eg, absence versus CPS); to detect potential structural brain lesions (focal slow-wave abnormalities); and to identify patients who have pseudoseizures.Computed tomography (CT) is of little use in the evaluation of a child who has epilepsy, except in special circumstances such as investigation of a child suspected of having congenital Cytomegalovirus infection characterized by periventricular calcifications or tuberous sclerosis typified by calcified tubers in the subependymal layer. CT studies of children who have epilepsy have shown an abnormality in approximately 30% of cases, consisting primarily of cortical atrophy or dilated ventricles; this provides little useful information for clinical management.MRI is gaining increasing importance in the study of children who have epilepsy, especially in examination of temporal lobe and hippocampal atrophy and sclerosis in patients resistant to anticonvulsant therapy. The use of MRI should be reserved for investigating all children who present with complex partial seizures, those who have a focal neurologic deficit (either static or postictal), those who present with complex seizures of increasing frequency or severity regardless of type, and all adolescents who have a first seizureThe initial step in the management of a child who is suspected of having epilepsy is to ensure that the paroxysmal event was, in fact, a seizure. A thorough history and examination coupled with appropriate studies and observation should distinguish nonepileptic events from seizures, as discussed previously.Whether anticonvulsant medication should be prescribed for the child who has a first nonfebrile seizure depends on the seizure type. The risk of recurrence following absence(typical or atypical) seizures,myoclonic seizures, and infantile spasms is certain; thus,anticonvulsants are initiated at the outset. A child who has a single afebrile tonic-clonic seizure, particularly if it occurs on awakening, has a good prognosis; 75% will not experience a second convulsion if the neurologic examination and EEG are normal and there is no family history of epilepsy. Anticonvulsants are not advised following the initial seizure in these children.However, when two or more unprovoked afebrile seizures occur within a 6- to 12-month time frame,anticonvulsants usually are indicated. Fasting blood glucose and serum calcium levels are indicated prior to the initiation of anticonvulsant therapy if the history suggests hypoglycemia or hypocalcemia as a cause of the seizure.Following the decision to treat with an anticonvulsant, the choice of drug depends on the seizure type or specific epileptic syndrome, as well as the efficacy and toxicity of the agent. The therapeutic goal is to treat with a single anticonvulsant that is most likely to control seizures completely with little or no adverse effects. Unfortunately, it is difficult to achieve these objectives in many cases. Table 3summarizes the choice of drugs used in specific seizure types, the dose, the range of therapeutic serum levels, and the potential side effects and toxicity for each anticonvulsant.The amount of attention that should be given to the standard therapeutic ranges of anticonvulsants in the management of childhood epilepsy is very controversial (see Table 3). Some children achieve seizure control with subtherapeutic serum drug levels (eg, carbamazepine); for others, the seizures do not come under control until serum drug levels above the published range are reached (eg, valproic acid). Thus, if standard therapeutic serum levels are used as the only benchmark,children will be overtreated or undertreated routinely. There are specific periods when therapeutic drug monitoring is indicated: 1) At the initiation of therapy to ensure that the therapeutic range is achieved, 2)During times of accelerated growth, and 3) If the seizures are out of control or the child is toxic. In general, the patient’s response to treatment is more important than the serum concentration of the drug.I also recommend routine drug monitoring in the following clinical situations: 1) Children who undergo a change in seizure type; 2) Patients who continue to have seizures in spite of an adequate drug dose based on weight and age; 3) Patients who have hepatic or renal disease;4) Children treated with phenytoin;5) Patients receiving multiple drugs(polytherapy), especially valproic acid, lamotrigine, and phenobarbital,because drug interactions are common; 6) Children who have mental and physical handicaps in whom drug toxicity may be difficult to evaluate; and 7) Patients and families who are noncompliant with the drug regimen.Adverse reactions to anticonvulsant drugs are common and on rare occasion may be life-threatening. Most serious adverse reactions occur during the initial 1 to 3 months of therapy and are more prominent when specific risks are present. For example, severe hepatotoxicity in association with valproic acid therapy is more likely to occur in the developmentally delayed or neurologically abnormal child younger than 2 years of age who is being treated with multiple anticonvulsants. The risk is even greater if the infant has an underlying metabolic disorder, particularly involving mitochondrial function. If the cause of the child’s seizure disorder is unknown, screening for a metabolic disorder (eg, blood gases, serum lactate and pyruvate, carnitine,ammonia, amino acids, and urinary organic acids) should be under-taken prior to the introduction of valproic acid.Routine screening with liver function tests and a complete blood count does not necessarily select patients destined to develop a serious adverse drug reaction such as aplastic anemia, hepatotoxicity, or Stevens-Johnson syndrome. In many cases the drug complication becomes apparent clinically prior to changes in blood test results. Thus,careful clinical monitoring of the patient, especially during the initial phase of treatment, is mandatory to identify early adverse reactions.Anticonvulsants may induce or inhibit enzyme production or they may displace another anticonvulsant from a shared plasma protein-binding site. Several anticonvulsants are capable of enzyme induction,including carbamazepine, primidone,phenytoin, and phenobarbital. When these drugs are used together, they may lower the plasma levels of each other by increasing the rate of metabolism. Conversely, enzyme inhibition tends to increase plasma levels by decreasing the rate of metabolism. An important example of this phenomenon is the potential for carbamazepine toxicity when erythromycin also is prescribed. Erythromycin inhibits microsomal enzyme systems, which results in decreased clearance of carbamazepine. Phenytoin and phenobarbital may be displaced from plasma protein-binding sites by valproic acid, which may lead to toxic serum levels that can be adjusted by lowering the dose of valproic acid. Valproic acid also reduces the plasma clearance and prolongs the half-life of lamotrigine. It is not known whether this interaction explains the increased incidence of severe skin rashes and Stevens-Johnson syndrome when valproic acid and lamotrigine are used simultaneously.Each anticonvulsant drug can cause unwanted behavioral and cognitive side effects in children. What often is not appreciated is that up to 30% of untreated children who have epilepsy experience behavioral problems, perhaps in part as a psychological reaction to the chronic condition or to dysfunction of the CNS. Furthermore, intellectual impairment has been well-described in children who have epilepsy. It often is difficult to determine whether behavior changes or poor academic performance by a child who has epilepsy is the result of the medication, the underlying seizure disorder, or both. Often the behavioral or performance problems are subtle,and they are recognized by parents or the teacher only after discontinuation of the anticonvulsant.Phenobarbital causes behavioral side effects in up to 50% of children, including personality change, irritability, fitful sleep,hyperactivity, short attention span, and depression. Many of the unwanted symptoms become less apparent when the dose is decreased. Because of the high frequency of side effects associated with phenobarbital, this agent no longer is the drug of choice in the treatment of childhood epilepsy. In decreasing frequency, the following drugs also may cause similar behavioral problems—ACTH, benzodiazepines, carbamazepine, phenytoin, and primidone. Valproic acid is the least likely to affect a child’s behavior adversely. Valproic acid also has little untoward influence on a child’s cognitive performance, although any anticonvulsant may produce unwanted behavioral side effects.If the child develops an adverse behavioral change following initiation of anticonvulsant therapy, theppediatrician has several options, including lowering the dose or if the problem persists,substituting another anticonvulsant for the offending drug. This situation also affords an opportunity to reassess the need for an antiepileptic drug. Follow-up should include an assessment of the child’s behavior and school performance on every visit. If academic or behavioral problems continue after drug readjustment or substitution, the child must be referred for a comprehensive evaluation to assess learning and cognitive parameters; plans also must be established for appropriate remediation.If a child’s seizures are completely controlled for a period of approximately 2 years, consideration should be given to weaning from the anticonvulsant, particularly if the child has no risk factors for seizures.The most prominent risk factors associated with recurrence of seizures include developmental delay or motor handicap, age greater than 12 years at seizure onset, neonatal seizures, and multiple seizures before control is attained. Absence and generalized tonic-clonic seizures on awakening tend to have a better outcome following drug withdrawal than partial complex seizures with secondary generalization. Agreement is not uniform as to the predictability of EEG abnormalities and seizure recurrence, whether at the onset of therapy or during follow-up. There is mounting evidence, however,that paroxysmal EEG features (eg, spike and wave) are a contraindication to withdrawing anticonvulsants. If the child has several risk factors, a trial with monotherapy (if the child is receiving several drugs) following 2 years of complete seizure control is suggested.The weaning process should be supervised closely and occur over a period of 4 to 6 months. If the child is receiving polytherapy, one drug should be removed at a time; the entire weaning period will be extended compared with that of a child receiving monotheraphy. Of those children who are seizure-free for 2 years and who have no risk factors, 70% to 75% will remain seizure-free without anticonvulsants. The most vulnerable time for seizure recurrence is the initial 6 months following drug withdrawal. If seizures recur, the child once again is placed on the drug that initially provided seizure control for at least 2 years. If the seizures reappear following a second drug withdrawal,life-long anticonvulsant theraphy may be required.The ketogenic diet was used frequently for the treatment of intractable epilepsy before the discovery of the newer antiepileptics—carbamazepine, the benzodiazepines,and vallproic acid. Interest has been renewed in this high-fat diet by television shows and videotapes sponsored by parent groups. The mode of action is unknown, but seizure control may be correlated directly with elevated levels of beta-hydroxybutyrate and acetoacetate that result from ketosis. Children who have complex myoclonic epilepsy associated with tonic-clonic convulsions are most likely to respond to the diet. For those who do respond, it often is possible to decrease or discontinue most, if not all, anticonvulsants, so that the child inevitably becomes brighter and more responsive. The use of valproic acid is contraindicated in conjunction with the ketogenic diet because the latter potentiates the hepatotoxicity of the former. The ketogenic diet may be appropriate for the child who has recalcitrant seizures despited polytheraphy, in whom an underlying cause of the seizure is unknown. Because the diet is unpalatable and has a high fat content, some children beyond the age of 1 to 2 years will not tolerate it. The ketogenic diet usually is continued for a period of 2 years in children who have good seizure control.Surgery is gaining increasing popularity as a method of treatment children who have focal seizures unresponsive to anticonvulsant therapy. The assessment of children for possible surgery must be conducted in a tertiary center by a skilled pediatric epileptologist in a multidisciplinary setting. Following routing EEGs,prolonged EEG recording with video monitoring is imperative to localize the site(s) and identify the frequency of epileptogenic discharges. Many centers use subdural electrodes to define the extent of the epileptogenic activity more accurately. These studies often are accomplished by decreasing or discontinuing the anticonvulsant drugs to promote frequent seizures, which increases the reliability of locating the seizure focus.In addition to the EEG studies,the child undergoes a series of other proceduresto assist in localization of the seizure focus and identification of the dominant cerebral hemisphere, including neuropsychologic evaluation, the Wada test (intracarotid injection of amobarbital),SPECT, PET in some centers, and MRI studies. These studies may identify a lesion corresponding to the focal seizure abnormality,including a low-grade glioma,hamartoma, or evidence of mesial temporal sclerosis. The results of epilepsy surgery in children who have a localized area of epileptogenic activity associated with a structural lesion is excellent. Temporal lobe resection is the most common surgery performed in children and adults; corpus callosotomy,hemispherectomy, and nontemporal lobe resections are more common in the younger child who has intractable seizures. Further development of electrophysiologic monitoring and advances in neurosurgery will allow more children who have focal seizures unresponsive to anticonvulsant therapy to benefit from epilepsy surgery.Appropriate and timely counseling of the parents and child is at least as important as choosing the correct anticonvulsant. Parents and patients who comprehend the purpose and side effects of anticonvulsant drugs as well as their action are much more likely to be compliant and supportive. At the time of diagnosis, the family often is overwhelmed and does not know where to start. It is useful initially to review the causes of epilepsy and explain the need for an EEG and additional studies if warranted. This consultation also provides an opportunity to dispel various myths about epilepsy.Subsequently visits should focus on factors that may exacerbate seizures,including a low-grade fever, undue stress, lack of sleep, and certain drugs such as methylphenidate and the phenotiazines. On occasion,anticonvulsants, particularly carbamazepine and phenytoin, may potentiate seizures. The physician should review first-aid measures that can be initiated at home if a seizure occurs. I recommend that the child not bathe or swim unattended because a seizure could result in drowning. However, the pediatrician should encourage participation in all activities, including contact sports if the patient desires, as long as appropriate protective equipment is used. Because adolescents who have epilepsy are primarily concerned about obtaining a driver’s license,the pediatrician should be aware of state laws governing driver’s licenses for people who have epilepsy. It is imperative that school teachers be made aware of children who have epilepsy because the children are at risk for learning disorders and require careful surveillance to identify situations in which special assistance is needed.The diagnosis of epilepsy frequently affects the family negatively. The parents are frightened that their child might die during a seizure,develop brain damage as a consequence of recurrent seizures, or have significant irreversible side effects from the anticonvulsant. Many parents feel guilty and vulnerable,particularly if there is a family history of epilepsy. If their fears and questions are not addressed adequately, a parent may tend to isolate the child,which will cause greater anxiety and family discord. The pediatrician must respond to the psychosocial needs of such a family. Most parents benefit from reading material produced by the Epilepsy Foundation of America and by participating in parent meetings sponsored by local epilepsy organizations. Time should be set aside at each follow-up visit to address concerns relating to any academic, social, or behavioral problems. As the parents become more familiar with the many facets of epilepsy, their confidence will grow and ability to cope will improve.Most children who have epilepsy are well-controlled on anticonvulsant medication with few if any side effects, have normal intelligence,and can be expected to lead normal lives. The pediatrician can play a pivotal role in ensuring that the child who has epilepsy reaches his or her highest potential.SUGGESTED RESOURCES FOR PARENTS AND CAREGIVERSFreeeman JM, Vinning EPG, Pillas DJ. Seizures and Epilepsy in Childhood: A Guide for Parents. Baltimore, Md:The Johns Hopkins University Press; 1993The Epilepsy Foundation of America4351 Garden CityLandover, MD 207851-800-332-1000The Epilepsy Foundation of America is an excellent resource for parents. Information is provided on a wide range of topics, including the use of medication, states that require physicians to report individuals who have epilepsy to the Department of Motor Vehicles,and a list of Epilepsy Centers within a specific region.