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By: B. Bernado, M.A., M.D., Ph.D.
Medical Instructor, University of Texas Southwestern Medical School at Dallas
Water Balance in Menstrual Cycles and Its Importance in Catamenial Epilepsy In 1911 medications overactive bladder discount dilantin online american express, drainage of subarachnoid fluid was noted to have some success in treating epilepsy (123) medicine allergic reaction discount dilantin 100mg without a prescription. This finding first led to studying the association with excessive water ingestion medicine prescription drugs purchase generic dilantin canada, as well as vasopressin and increased seizure frequency (124), while negative water balance by fluid restriction was shown to decrease seizure frequency (125). However, Ansell and Clarke (126) found no significant differences in body weight, sodium metabolism, or total body water in 14 epileptic patients, including seven women with perimenstrual seizures, and 10 healthy controls, or between epileptic women with and without catamenial tendencies. However, clinicians must take care in understanding the medications pharmacokinetics, as only a medication with a linear doselevel relationship should be tried in this manner. Management of Catamenial Epilepsy Most of the following interventions have been described as treatments aimed at the premenstrual seizure exacerbation pattern or C1 as described above, which is the most frequent type of catamenial exacerbation; therefore, it accounts for the occasional success reported with these treatments. It should be kept in mind that only women with regular menstrual periods are good candidates for these interventions, since they must be taken a proscribed number of days after the onset of menstrual bleeding. Usually this is around day 18 to 21 depending on the individual seizure pattern, since the luteal phase is unvaryingly 14 days long. It is believed that the effectiveness of this medication for catamenial epilepsy stems from the fact that you are halting normal menstruation. In 1986, Herzog (132) was first to describe natural progesterone and its use in seizure treatment. They were given doses ranging from 50 to 400 mg, and were dosed every 12 hours during the phase of highest seizure frequency. Doses were adjusted to obtain serum levels ranging from 5 to 25 ng/mL about 2 to 6 hours after dosing. The most common side effects were fatigue and depression that resolved with decreasing dosing levels. The study group was 25 women with temporal lobe epilepsy matching the definition for catamenial epilepsy in the perimenstrual (n 11) or luteal (n 14) phases. The women were all started at 200 mg three times daily during their exacerbation phase. The results show that over a 3-month period, 72% of women reported a decrease in seizure frequency and that the average daily seizure frequency decreased by 55%. In a 3-year follow-up of the remaining 23 women, the mean reduction in focal and generalized seizures was 54% and 58%, respectively. Common and usually dose-related adverse effects include paresthesias, drowsiness, nausea, malaise, fatigue, and diuresis. Their main use is for abortive therapy due to the development of habituation and tolerance with chronic, long-term use. However, they have long been used as a practical and safe intermittent treatment approach for catamenial seizure exacerbations. Clobazam is the only benzodiazepine studied for the treatment of catamenial epilepsy, and has been shown to be effective (129). Clobazam, at 20 to 30 mg/day, cyclically taken 2 to 4 days premenstrually has been shown to reduce catamenial seizures as well as decrease the tolerance associated with continual use. Clobazam, however, is not available in the United States, but this data does support the use of intermittent benzodiazepines in the treatment of catamenial epilepsy. Chapter 44: Hormones, Catamenial Epilepsy, Sexual Function, and Reproductive Health in Epilepsy 547 randomized clinical trial has been performed and is under analysis. As of this writing, natural progesterone is not approved for use in the treatment of seizures; however, it is used as an off-label medication. It is not a stretch to expect that sexual function of men and women with epilepsy could be affected. While this subject is usually avoided by the clinician and the patient alike, it is an important aspect to consider. Epilepsy appears to produce a higher incidence of sexual dysfunction compared to other neurologic diseases. This section will cover in more detail the prevalence, common manifestations, localization, and etiology of sexual dysfunction. Total and free testosterone levels are indicated in this situation and usually are low. The effects of testosterone replacement tend to decrease over time with use, and also there is not sufficient evidence for long-term safety of testosterone replacement, particularly in mature men regarding the effects on prostate growth (146).
The second model involves naturally occurring reflex epilepsies or seizures induced by specific sensory stimulation in genetically predisposed animals symptoms women heart attack buy dilantin 100mg with mastercard. This technique also demonstrated that strychninization of auditory (13) treatment restless leg syndrome discount dilantin american express, gustatory (14) medications 142 buy dilantin 100mg lowest price, and olfactory cortex (15) produced focal irritative lesions that may produce seizures with the appropriate afferent stimulus. Hunter and Ingvar (20) identified a subcortical pathway involving the thalamus and reticular system and an independent cortico-cortical system for radiation of visual-evoked responses to the frontal lobe. In cats and monkeys, the fronto-rolandic region was also shown to receive spreading-evoked paroxysmal activity from auditory and other stimuli (21,22). The second approach, the study of naturally occurring or induced reflex seizures in genetically susceptible animals, has been pursued in domestic fowls and chickens with photosensitivity (23,24), rodents susceptible to sound-induced convulsions (25), the E1 mouse sensitive to vestibular stimulation (26), and the Mongolian gerbil sensitive to a variety of stimuli (27,28). The occipital lobe does not generate this abnormal activity but sends cortico-cortical visual afferents to hyperexcitable frontal cortex, which is responsible for the epileptiform activity (31). Brain stem reticular activation depends initially on frontal cortical mechanisms until a seizure is about to begin, at which point the cortex can no longer control reticular activation. The genetically determined hyperexcitability may be related to cortical biochemical abnormalities, involving regulation of extracellular calcium concentration (32,33) or an imbalance between excitatory and inhibitory neurotransmitter amino acids (34) similar to those described in feline generalized penicillin epilepsy and in human epilepsy (35). In human epileptic photosensitivity, generalized epileptiform activity and clinical seizures can be activated by the localized occipital trigger. We (40) suggested that a similar mechanism involving recruitment of a critical mass of parietal rather than visual cortex is responsible for generalized seizures induced by thinking or by spatial tasks. Wieser proposed a neurophysiologic model for critical mass (9), referring to the group 1 and group 2 epileptic neurons of the chronic experimental epileptic focus described by Wyler and Ward (43). Group 1 neurons produce abundant, spontaneous, high-frequency bursts of action potentials. Group 2 neurons have a variable interspike interval, and their spontaneous epileptic activity is less marked. Moreover, these properties are influenced by external stimuli that can promote or inhibit the incorporation of group 2 neurons into the effective quantity of epileptic tissue and thus trigger or inhibit a seizure. This mechanism also can explain conditioning (44) and deconditioning (45) of reflex epileptic responses. A further generalizing system also must be postulated to account for the seizures observed with photic or cognitive stimulation, analogous to the cortico-cortical pathways linking occipital cortex with fronto-rolandic cortex in Papio papio. A role for reticulothalamic structures has been suggested but seems unnecessary, at least in certain animal models in which cortico-cortical spread of evoked epileptic activity persists after mesencephalic and diencephalic ablation (20). Patients with reflex seizures may report that emotion plays a role in seizure induction and, sometimes, in seizure inhibition. An emotional component was also obvious in several cases of musicogenic and eating epilepsy. Fenwick (47) described psychogenic seizures as epileptic seizures generated by an action of mind, self-induced attacks. This use of the term psychogenic seizures, common in European epileptology, does not refer to nonepileptic events. Fenwick related seizure induction and inhibition in some individuals with or without typical reflex seizures to the neuronal excitation and inhibition accompanying mental activity. He also referred to the alumina cream model, with recruitment of group 2 neurons and evoked change in neuronal activity surrounding the seizure focus as factors in seizure occurrence, spread, and inhibition. Wolf (48) believed that two pathophysiologic theories have arisen in the discussion of reflex epilepsies. For primary reading epilepsy he observed that seizure evocation would depend on involvement of the multiple processes used for reading, an activity involving both hemispheres, with a functional rather than a topographic anatomy. The recruitment that produces these seizures, however, need not be confined to physically contiguous brain tissue or fixed neuronal links. Instead, it may depend on activity of a function-related network of both established and plastic links between brain regions, modified by the effects of factors such as arousal. Disorders of cortical development may be present in some patients with reflex seizures. Chapter 24: Epilepsy with Reflex Seizures 307 Recent detailed studies on subjects known to have visually induced seizures examined whether color modulation could be an independent factor in human epileptic photosensitivity. Among photosensitive epilepsy patients sensitive to flash and pattern stimulation, 25/43 were sensitive to color stimulation, particularly at frequencies below 30 per sec. Red was the most effective color and red-blue was the most provocative alternating stimulus. They concluded that "color sensitivity follows two different mechanisms: one, dependent on color modulation, plays a role at lower frequencies (5 to 30 Hz).
Most studies have examined activity in the maximal electroshock-induced seizure test used in rodents treatment alternatives for safe communities purchase dilantin 100mg. Human randomized controlled trials have shown lacosamide to have efficacy as an adjunctive therapy in adults with partial-onset seizures z pak medications order cheapest dilantin, although medications hyperthyroidism generic 100mg dilantin amex, 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. Importantly, there was no change in the serum concentrations of coadministered anticonvulsants. Dose-Range Study Dose-finding studies are critically important in the clinical development of a new drug. They help define the no-effect, the mean effective, and the maximal effective doses and determine a potentially optimal therapeutic dose range. In a pooled post hoc review of 1294 patients treated in three placebocontrolled, double-blind, international clinical trials evaluating the efficacy and safety of adjunctive lacosamide (200 to 600 mg/day) in adults 16 years with partial-onset seizures with or without secondary generalization, Chung et al. Dosage with 200 mg/day produced a variable effect, although pooled data suggested that 200 mg/day was efficacious compared to placebo. Lacosamide was added to carbamazepine (33%), lamotrigine (33%), levetiracetam (30%), valproate (23%), topiramate (23%), and oxcarbazepine (17%). Lacosamide showed a similar magnitude of reduction versus placebo regardless of which combination of antiepileptic medication regimens it was added to . This suggests an independent additive efficacy in excess of that provided by pre-existing antiepileptic medication to which lacosamide was added. The time of onset of efficacy is an important consideration in the choice of antiepileptic medication. Lacosamide in fixed doses of 200, 400, or 600 mg/day were used in these pooled data. Titration was started at 100 mg/day during the initial week of lacosamide exposure, followed by weekly titration in 100-mg increments to the assigned target dose.
In monotherapy symptoms thyroid order dilantin in india, it should be initiated with 25 mg/d for 2 weeks medicine 44334 purchase dilantin 100mg on-line, followed by 50 mg/d for 2 weeks treatment vitamin d deficiency buy dilantin 100mg without a prescription, then 100 mg/d. The titration rate is half as fast with adjunctive valproic acid but can be twice as fast in the presence of an enzyme inducer and absence of valproic acid. A serum concentration is helpful to guide further titration if seizures are still not controlled at a dose of 600 mg/d. It may even improve efficacy when used 2 times a day in patients who are drug resistant. The risk of rash is increased in patients with a prior rash when on carbamazepine or phenytoin. Its monotherapy use is associated with one of the lowest rates of teratogenicity, favoring its use in women of childbearing age. Lamotrigine may have pharmacodynamic interactions with other classic sodium channel blockers, resulting in adverse effects at lower than expected serum concentrations. However, its combination with valproate can be synergistic, with greater efficacy than predicted. It is also a weak carbonic anhydrase inhibitor, but this mechanism does not contribute significantly to its efficacy. It is partially metabolized in the liver, with about 70% eliminated unchanged in the urine. It is suggested to start with 25 mg/d and increase the dose by 25 mg every week up to 100 mg/d. Further titration by 25 mg to 50 mg every week can be considered, up to 400 mg/d in 2 divided doses. Topiramate is less well tolerated than lamotrigine, the main tolerability issue being cognitive adverse effects, including cognitive slowing, decreased attention and memory, impaired executive function, word-finding difficulty, and reduced verbal fluency. Paresthesia in the hands and feet can occur with initiation and with dose increase but usually resolve. Lamotrigine clearance is decreased by valproate and increased by estrogen and pregnancy as well as by enzyme inducers. Oligohidrosis, hyperthermia, and metabolic acidosis may occur, more commonly in children. Topiramate is associated with increased birth defects at a rate of approximately 4%, particularly oral clefts. It is effective as adjunctive therapy for focal and generalized seizures and Lennox-Gastaut syndrome. It is 96% protein bound, but this is of limited importance because dosing decisions are not dependent on the level, and its serum concentration is so low that it does not significantly compete for protein binding. Its half-life is 7 to 9 hours in monotherapy, shortened to 2 to 5 hours in the presence of an enzyme inducer. It is used off-label in the management of spasticity in multiple sclerosis, in the treatment of addiction, and to increase deep sleep proportion. It should be started at 4 mg at bedtime and increased by 4 mg every week to an initial target dose of 8 mg 3 times a day. The dose can be increased further by 4 mg every week up to 12 mg to 16 mg 3 times a day. The most common adverse effects are dizziness, asthenia, nervousness, tremor, depression, and emotional lability, which are more common during titration. Tiagabine may be associated with dose-related episodes of nonconvulsive status epilepticus or encephalopathy, which may occur even in the absence of epilepsy. This seems to result in nonspecific decrease in neurotransmitter release in a state of neuronal hyperactivation. It has no hepatic metabolism; 66% is excreted unchanged in the urine, and the rest is hydrolyzed to inactive compounds. Levetiracetam is a broad-spectrum drug, effective against focal seizures, generalized tonic-clonic seizures, and generalized myoclonic seizures.
Valproic acid and divalproex sodium: Hepatoxicity medicine emoji order dilantin on line amex, including fatalities treatment lupus generic dilantin 100mg mastercard, have been reported treatment quad strain cheap dilantin online mastercard, usually during the first 6 months of treatment. Valproate should not be given to a woman of childbearing potential unless the drug is essential to the management of her medical condition, and women should use effective contraception while using valproate. Patients and guardians should be warned that abdominal pain, nausea, vomiting, and/or anorexia can be symptoms of pancreatitis that require prompt medical evaluation. Vigabatrin: Vigabatrin can cause permanent bilateral concentric visual field constriction, including tunnel vision that can result in disability. In some cases, vigabatrin may also damage the central retina and may decrease visual acuity. However, this assessment cannot always prevent vision damage, and once detected, vision loss due to vigabatrin is not reversible. Vigabatrin should be withdrawn from patients who fail to show substantial clinical benefit. Healthcare providers who prescribe vigabatrin and pharmacies that dispense the product must be specially certified. Everolimus is an antineoplastic, immunosuppressant agent associated with several adverse reactions. It is intended for internal use only and should be disseminated only to authorized recipients. The contents of the therapeutic class overviews on this website ("Content") are for informational purposes only. The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Patients should always seek the advice of a physician or other qualified health provider with any questions regarding a medical condition. Clinicians should refer to the full prescribing information and published resources when making medical decisions. Additionally, some medications are recommended to be titrated during initial treatment. Please refer to the prescribing information of the individual products for more detailed information. It is intended for internal use only and should be disseminated only to authorized recipients. The contents of the therapeutic class overviews on this website ("Content") are for informational purposes only. The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Patients should always seek the advice of a physician or other qualified health provider with any questions regarding a medical condition. Clinicians should refer to the full prescribing information and published resources when making medical decisions. Capsules are extended-release and may be suitable for oncedaily dosing in some adults. Immediate-release tablets are given 2 to 3 times per day and the suspension is given 4 times per day. Carbatrol and Equetro are twice-daily extendedrelease capsule formulations; these capsules may be opened and sprinkled on soft food. Delayed-release tablet and capsule doses > 250 mg per day should be given in divided doses. Suspension should be prepared using water only and administered immediately after preparation. It is intended for internal use only and should be disseminated only to authorized recipients. The contents of the therapeutic class overviews on this website ("Content") are for informational purposes only. The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Patients should always seek the advice of a physician or other qualified health provider with any questions regarding a medical condition. Clinicians should refer to the full prescribing information and published resources when making medical decisions.
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