Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027066 (myoclonus)
 4,275 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effects of rapid intracarotid injection of 20 to 100 mg of sodium amobarbital were studied in three patients with bilateral myoclonic status epilepticus due to Jakob-Creutzfeldt disease, sequelae to anoxic encephalopathy, and hepatic coma, respectively. In each instance, the drug produced prompt abatement of clonic jerks contralaterally and attenuation of electroencephalographic epileptiform discharges ipsilaterally. These results suggest that the cerebral cortex actively participates in the elaboration of certain types of bilateral myoclonus in human beings.
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PMID:Electrographic and clinical effects of intracarotid sodium amobarbital on bilateral myoclonic status epilepticus. 32 84

Continuous myoclonus in a localised area of the body was observed in three patients. In two cases the myocloni sometimes developed into motor Jacksonian convulsions. All three patients had neurological signs on the same side as their continuous twitching indicating a lesion of the contralateral hemisphere. The surface EEG did not show changes which could be directly correlated with continuous convulsions in any of the cases. The cause was found to be a malformation of the hemisphere in one case, a recent encephalomalacia in the second and a severe hyperosomolar diabetic electrolyte imbalance in the third. Epilepsia partialis continua Kozevnikov differs from motor Jacksonian epilepsy in the continuous non-attack character and the absence of a "march of convulsions". Pathophysiologically they are both forms of focal cortical status epilepticus.
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PMID:[Epilepsia partialis continua of Kozevnikov (author's transl)]. 40 31

Lithium is known to potentiate the ability of pilocarpine to induce status epilepticus in rats. The goal of this study was to determine whether lithium could potentiate pilocarpine-induced seizures in developing animals. Behavioral, electroencephalographic (EEG), and histopathological changes induced by systemic administration of lithium (3 meq/kg) followed 20 h later by pilocarpine (3, 10, 30, 60 mg/kg) were studied in 3-30-day-old rats. Lithium followed by pilocarpine (30 and 60 mg/kg) induced hyperactivity, tremor, loss of postural control and scratching but no electrographic seizures in 3-8-day-old rats. In the 7-10-day-old animals pretreatment with lithium and pilocarpine 60 mg/kg induced status epilepticus with sustained myoclonus and continuous bilateral synchronous spike and sharp wave, but doses of pilocarpine lower than 60 mg/kg had no effect. The susceptibility to lithium-pilocarpine-induced status epilepticus increased markedly during the third postnatal week of life. During this time period, rats treated with lithium (3 meq/kg) plus pilocarpine 10 mg/kg exhibited behavioral and EEG manifestations of status epilepticus. The same combination of lithium and pilocarpine failed to induce status epilepticus either before or after the third week of life. Histopathological analysis of the brains of the animals used in these studies failed to demonstrate the widespread damage reported in adult rats that have undergone lithium-pilocarpine-induced status epilepticus.
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PMID:Ontogenic study of lithium-pilocarpine-induced status epilepticus in rats. 132 90

We report 11 adults who exhibited myoclonic status epilepticus (MSE) after cardiac arrest. Based on pathologic, electroencephalographic, and clinical evidence, we conclude that our patients died from the initial anoxic-ischemic insult rather than as a result of MSE. We suggest that the seizures in these nonsurvivors were self-limited events arising from lethal damage to neurons. Thus, in patients with bilaterally synchronous facial myoclonus, bilateral loss of pupillary or oculovestibular reflexes, and suppression and burst-suppression on EEG, it is not warranted to use anesthetic barbiturates to treat MSE.
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PMID:The significance of myoclonic status epilepticus in postanoxic coma. 212 7

The spatial and temporal EEG features of the epileptogenic syndrome induced by cessation of chronic intracortical GABA infusion in normal rats are described. In the initial stages, the paroxysmal discharges (PDs) induced by withdrawal from unilateral GABA application may appear either unilaterally or bilaterally, although with greater amplitude on the infused side. PDs are transitorily accompanied by behavioral signs of distal myoclonus of the body territory corresponding to the infused area (contralateral hindlimb). Later, the paroxysmal activity becomes more localized, circumscribed to the cannula-infused site and with ipsilateral propagation to anterior cortical areas. The amplitude of PDs decreases progressively while their frequency increases, reaching its maximal value at about 4 h after the first PDs have appeared. In the final stages of the syndrome, which may last several days, clinical manifestations are absent and PDs are activated by slow-wave sleep and reduced during REM sleep and waking. Chronic intracortical applications of taurine failed to induce any electroclinical changes on withdrawal and were unable to inhibit the focus elicited by GABA withdrawal, whereas reinstatement of GABA infusion into the epileptogenic area was effective in blocking the paroxysmal activity. Intracortical infusion of baclofen induced the appearance of an epileptogenic focus that waned on withdrawal. The GABA-withdrawal syndrome appears to be a new model of focal status epilepticus; it may be useful as an experimental model of human partial epilepsy to investigate the role of GABAergic neurotransmission.
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PMID:Electroencephalographic study of the GABA-withdrawal syndrome in rats. 236 74

Focal cortical myoclonus is rare. Obvious causes include tumor or atrophy involving the motor strip, but in some cases no cause is apparent. We present 4 patients who started to have focal myoclonus in childhood. All had focal motor seizures as well, and one had recurrent focal motor status epilepticus. All 4 had a mild progressive hemiparesis. Electrographic investigations showed focal epileptic discharges in the contralateral rolandic areas. Radiological studies were unrevealing, but magnetic resonance showed rolandic lesions in 3 patients. At surgery, abnormally wide gyri were found in the distribution demonstrated by magnetic resonance. The pathological substrate was focal cortical dysplasia. All patients have improved considerably following surgery. These findings suggest that focal myoclonus may be due to a rolandic neuronal migration disorder. Visualization of these lesions by magnetic resonance permits development of a surgical strategy leading to optimal treatment of these medically intractable epileptic disorders.
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PMID:Focal cortical myoclonus and rolandic cortical dysplasia: clarification by magnetic resonance imaging. 313 90

An unsuccessful attempt to terminate myoclonic status epilepticus with elevation of serum magnesium levels is described. During 3 days, serum magnesium was increased from 1.5 mEq/L to 14.2 mEq/L by continuous i.v. infusion of 3-6 g/h of magnesium sulfate. Other anticonvulsants were maintained at nearly constant levels. Cerebrospinal fluid magnesium was 3.5 mEq/L during the infusion. Despite magnesium-related neuromuscular blockade and accompanying cessation of visible myoclonus, the electroencephalogram revealed ongoing blunted sharp-wave activity at the baseline frequency. Transient complications of the infusion included prolongation of the PR interval on the electrocardiogram, hypomotility of the gastrointestinal tract, and peripheral muscle flaccidity, all of which resolved within 24 h of return to normal serum magnesium levels. These results suggest that the therapeutic role of magnesium in myoclonic status epilepticus is limited.
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PMID:Failure of high-dose intravenous magnesium sulfate to control myoclonic status epilepticus. 314 67

Fifty-two patients having suffered 60 episodes of non convulsive Status Epilepticus (SE) proven by electroencephalography between 1976 and 1986 are reported. According to electroclinical criteria, these SE were classified into three groups: Petit Mal Status (PM St), Psychomotor Status (Ps M St) and Frontal Polar Status (F St). The exact diagnosis could not be accurately established by the clinical examination alone. It required the analysis of the ictal EEG. However, some clinical signs might suggest the correct diagnosis. Thus, a fluctuating confusional state associated with myoclonus suggested a PM St. A state of confusion with alteration of the emotional sphere evoked especially a Ps M St. A confusional state associated with behavioural disorders of euphoric type and to programmation difficulties was seen mainly in F St.
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PMID:[Confusional states of epileptic origin. Value of emergency EEG]. 318 98

We studied the effect of seizures and myoclonus following cardiopulmonary resuscitation (CPR) on the outcome of all comatose adult survivors of CPR over an 8-year period. Either seizures or myoclonus occurred in 50 of 114 patients (44%): seizures in 41 patients (36%) and myoclonus in 40 (35%). Status epilepticus or status myoclonus occurred in 36 patients (32%), and 19 (17%) had myoclonic status epilepticus (MSE). Seizures and myoclonus per se were not significantly related to outcome, but status epilepticus, status myoclonus, and, particularly, MSE were predictive of poor outcome as judged by survival and recovery of consciousness.
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PMID:Outcome from coma after cardiopulmonary resuscitation: relation to seizures and myoclonus. 334 43

A 26 year-old mentally retarded woman suffering from Marfan's syndrome and epileptic seizures presented weekly recurrent complex partial status epilepticus for two years, and myoclonus at rest. A marked increase of the myoclonic jerks and transient signs of cerebellar dysfunction followed each occurrence of the status epilepticus. Myoclonus could be interpreted as: 1) a permanent neurologic consequence of primary CNS disorders or secondary to disorders of the connective tissue, 2) a persistent post-ictal sequela sustained by recurrence of complex partial status, or 3) an additional consequence of both brain disorders due to Marfan's syndrome and recurrence of complex partial status epilepticus. The case report raises the possibility that recurrence of complex partial status for a long period may be a risk factor of permanent neurologic deficit, especially in already brain damaged patients.
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PMID:Marfan's syndrome, recurrent complex partial status epilepticus and myoclonus: a case report. 339 3


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