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By: I. Gorok, M.B. B.CH., M.B.B.Ch., Ph.D.
Assistant Professor, University of Minnesota Medical School
Success was defined as complete cessation of motor and electroencephalographic seizure activity within 20 minutes after the drug infusion began treatment kidney disease cheap topamax 200mg with mastercard, without return of seizure activity during the next 40 minutes medicine express buy topamax uk. Analyses were performed both on an intentto-treat basis and including only patients with a verified diagnosis of generalized convulsive status epilepticus medications containing sulfa generic topamax 200mg on line. Among the 384 patients with verified overt generalized convulsive status epilepticus treatment impetigo purchase topamax with amex, lorazepam was the most successful treatment (64. However, the four groups did not differ significantly either for the subgroup of verified subtle generalized convulsive status epilepticus or in the intent-to-treat analysis. The authors concluded that lorazepam is more effective than phenytoin for the treatment of overt generalized convulsive status epilepticus (119). Controlled studies have shown that phenytoin does not prevent nonepileptic alcohol-related seizures (120,121). Cumulative percentage of patients remaining in the study during 36 months of follow-up. No significant differences in efficacy were found among the four drugs at 1, 2, or 3 years of follow-up. The incidence of unacceptable side effects necessitating withdrawal from treatment was 10% (127). Each study was a randomized (1:1 oxcarbazepine:phenytoin), double-blind, parallel-group trial consisting of a 14-day screening phase followed by a 56-week double-blind period (8-week flexible titration phase followed by a 48-week maintenance phase). One study (128) involving 287 adults and adolescents, ages 15 to 91 years, demonstrated no difference in the proportion of seizure-free patients during the 48 weeks of maintenance between the oxcarbazepine group (59%) and the phenytoin group (58%). The second trial (129), in 193 children and adolescents, ages 5 to 17 years, also showed no difference in the proportion of seizure-free patients during the 48-week maintenance period between the oxcarbazepine group (61%) and the phenytoin group (60%). After randomization to either lamotrigine (n 86) or phenytoin (n 95), patients entered a 6week flexible titration phase, followed by a 48-week maintenance phase. No between-treatment difference in efficacy was detected on the basis of percentages of patients remaining on each treatment arm, those remaining seizure free during the last 24 and 40 weeks of the study, and times to first seizure after the initial 6 weeks of treatment (dose-titration period). One study compared the efficacy and toxicity of phenytoin, phenobarbital, carbamazepine, and valproate as monotherapy in children with newly diagnosed epilepsy (131). Comparative efficacy was assessed by analysis of time to first seizure recurrence after the initiation of therapy, and by time to achieve a 1-year of seizure freedom. The likelihood ratio comparing the four drugs showed no difference between the drugs for either measure of efficacy at 1, 2, or 3 years of follow-up. Patients on phenobarbital were more likely to withdraw because of intolerable side effects, compared to those on the other drugs. There was no significant difference in the rate of withdrawal between the other drugs (131). Neonatal Seizures Phenytoin and phenobarbital monotherapy were compared in a randomized trial of 59 neonates with seizures confirmed by electroencephalography (132). Seizures were controlled in 43% of the phenobarbital group and in 45% of the phenytoin group. The authors concluded that both drugs were "equally but incompletely effective as anticonvulsants in neonates. As expected, the most common treatment for neonatal seizures was phenobarbital, which was given to 76% of all infants in the study (range, 56% to 89%, P 0. It was used to treat 16% of all neonates diagnosed with neonatal seizures (range, 8% to 36%, P 0. Phenytoin was started at least 1 day after phenobarbital 46% of the time, started on the same day as phenobarbital 32% of the time, and started at least 1 day before phenobarbital 11% of the time (133).
Efficacy and safety of high- versus low-dose rufinamide monotherapy in patients with inadequately controlled partial seizures sewage treatment cheap 100mg topamax mastercard. Efficacy and safety of rufinamide as adjunctive therapy for inadequately controlled partial seizures in pediatric patients medicine while pregnant buy genuine topamax line. Efficacy and safety of adjunctive rufinamide in patients with inadequately controlled primary generalized tonic-clonic seizures medications diabetes order generic topamax. First experiences with rufinamide: tolerability and effectiveness in clinical practice medications on a plane generic 200mg topamax amex. Lennox-Gastaut syndrome: a consensus approach on diagnosis, assessment, management, and trial methodology. Lacosamide is a new investigational antiepileptic medication approved for use as adjunctive therapy for adults with partial complex seizures. Although, it was specifically synthesized as an antiepileptic medication, as with many newer agents, it was found to have additional pharmacologic properties including a role in the alleviation of pain associated with diabetic neuropathy. The indication for pain associated with diabetic neuropathy is under Food and Drug Administration review. Preclinical development suggests neuroprotection in animal models of seizures as well as in status epilepticus models. Most studies have examined activity in the maximal electroshock-induced seizure test used in rodents. Human randomized controlled trials have shown lacosamide to have efficacy as an adjunctive therapy in adults with partial-onset seizures, although, efficacy in other epilepsy syndromes is being investigated. It is a light yellow crystalline powder that is soluble in phosphate-buffered saline (pH of 7. Animal models where lacosamide has had antiseizure activity demonstrated include mice with audiogenic seizures and maximal electroshock and N-methyl-D-aspartate induced seizures (2). The primary mechanism of action appears to be selective enhancing the slow inactivation of voltage-gated sodium channels without interfering with fast inactivation. Slow inactivation of sodium channels is an endogenous mechanism whereby neurons reduce ectopic hyperactivity, and may represent an effective mechanism to selectively reduce ictal hyperactivity without altering physiologic function (3). Lacosamide, unlike carbamazepine, lamotrigine, and phenytoin, did not produce frequency-dependent facilitation of block of 3-seconds, 10-Hz pulse stimulation train. The slow inactivation voltage curve was shifted in the hyperpolarizing direction and significantly promoted the shift of channels to the slow inactivated state without impairing rate of recovery. They found a dose-dependent inhibitory effect on the development of kindling and concluded that lacosamide could retard kindling-induced epileptogenesis. While the role of these potential neuroprotective effects may treat seizures and prevent epilepsy progression, they are yet to be evaluated clinically. Lacosamide in Acute Status Epilepticus Lacosamide is highly potent in acute status epilepticus models. Early treatment with lacosamide resulted in a dose-dependent reduction of the number of spontaneous recurrent seizures of up to 70%. The number of seizurefree animals increased from 0% in the untreated group to 65% in the highest dose groups. Protection of hippocampal structures within 72 hours following induction of status epilepticus was greatly enhanced. Dose ranges that were tested in these situations are between 200 and 600 mg/day (Table 65. All three used similar randomization with double-blind parallel-group design in a 12-week dose escalation with target 100 mg/day increments followed by a 12-week maintenance period. At these dosages, compared to placebo, median seizure frequency was reduced 40%, with 49% of patients experiencing a 50% or greater reduction in seizure frequency. In these studies, adverse effects included common neurologic symptoms, including nausea, headache, ataxia, fatigue, and diplopia. Serious adverse effects resulting in medication withdrawal occurred in less than 1% of all patients. Adverse effects resulting in withdrawal most frequently consisted of exacerbation of convulsive seizures and intolerable dizziness.
Removal of a radiation-induced frontal lobe cavernous malformation resulted in amelioration of his disabling seizure type 2 medications that help control bleeding buy topamax once a day, illustrating how focal resection of the more deleterious focus may dramatically improve quality of life medicine to prevent cold order topamax in united states online, despite the multifocal background (53) treatment kennel cough cheap 200 mg topamax with visa. The hypothesis we began with was that medicine for bronchitis generic topamax 100mg free shipping, despite the multifocal findings on imaging and electrophysiology, an ictal focus could be identified and resected in these patients. The multidisciplinary epilepsy team felt that the alternative path, a continued course of severe epilepsy despite multiple medications, entailed significant risk as well. The real challenge facing the treating team lies in not only identifying a potentially discrete resectable focus in patients with multifocal epilepsy, but in distinguishing whether this focus is primary, necessitating removal, or secondary. Ultimately, this is determined by whether the removal of a presumed primary ictal focus results in cessation of seizures. Therefore, the goal in multifocal epilepsy should be to identify a primary epileptogenic zone for strategic resection. However, in reality, this is often not possible, raising the need to consider multifocal resection, in which the aim is to remove all individual sites of presumed ictal onset. However, this too, is often not feasible in many cases, due to several factors, which include the presence of too many disparate epileptogenic zones to be handled surgically, bilaterally homologous foci, or their overlap with eloquent cortex (32). Indeed, it is often difficult to define the epileptogenic zone with precision when only a single seizure focus exists (14). Their surgical approach for addressing this multifocal situation was to utilize extensive surgery, with resection of not only the polymicrgyria lesion, but also distal brain areas that were determined to be part of this large network (55). Their excellent outcomes allowed them to argue that this strategy was optimal, although they did not definitively prove that removing the extralesional sites was required for seizure freedom. We have proposed multistage epilepsy surgery as one possible approach for rationally trying to distinguish which foci need to be resected in the patient with presumed multifocal epilepsy (14,33,56). Theoretically, this strategy should define those multifocal epilepsy settings in which one needs to carry out actual multifocal resections. We have found this technique to be useful, with acceptable risk, in a subset of pediatric patients with poorly localized medically refractory epilepsy (14,15,33). Disadvantages of this surgical strategy include the extra cost, hospital length-of-stay, and the theoretical risk associated with an additional operation. Second, the alternative strategy may 960 Part V: Epilepsy Surgery be better: resecting the presumed primary focus only and "seeing how the patient does. Our experience indicates that families seem more willing to undergo an additional surgical stage acutely rather than return to the operating room at a later date. Finally, we do not know definitively whether what is recorded between the second and third surgical stages is actually clinically significant. Perhaps seizures recorded after the initial resection would simply dissipate over time, obviating the need for further resection. While we have been encouraged by the utility and safety of the multistage approach, it, nevertheless, clearly reflects the philosophy and referral bias of our institution. The limitations of this strategy point to the need for better noninvasive modalities for defining those specific situations that demand multifocal resection. But, lacking this experience, how can one transform an occult primary seizure focus within a multifocal background into a revealed one that can be targeted Emerging technological advances indicate that continued progress in the field is being made. Because the extensive preoperative evaluation did not precisely localize a seizure focus that could be targeted with epilepsy surgery, and in light of her severe medically refractory epilepsy and developmental regression, the patient initially was offered, and underwent, a bilateral electrode survey, which surprisingly revealed unilateral right hemisphere ictal onsets. She subsequently underwent multifocal resections (frontal, parietal, and temporal) of the epileptogenic zones within the involved right hemisphere. She developed relatively well until age 2, when she experienced an episode of nonconvulsive status, resulting in the loss of language that had developed up to that point, and developmental regression in general. Despite multiple antiepileptic medications, she continued to have daily seizures, about four events per day on average. The seizures consisted of staring spells, eyes rolling up to the right, a smile appearing on her face with twitching of the left and occasionally the right corner of her mouth, followed by a series of head drops and upper extremity elevation. Other seizures were characterized by right arm clonic activity, right head deviation, and tongue thrusting lasting less than 1 minute. All of these lesions were relatively small in size, and no lesion was calcified or enhanced with gadolinium contrast.
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