myoclonus


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Related to myoclonus: myoclonus epilepsy

myoclonus

 [mi″o-klo´nus]
shocklike contractions of part of a muscle, an entire muscle, or a group of muscles; usually a manifestation of a convulsive disorder. adj., adj myoclon´ic.
A single myoclonic arm or leg jerk is normal when the person is falling asleep. Myoclonic jerks are severe with grand mal seizures. From Jarvis, 1996.
palatal myoclonus a condition characterized by a rapid rhythmic movement of one or both sides of the palate.

my·oc·lo·nus

(mī-ok'lō-nŭs, mī-ō-klo'nŭs),
One or a series of shocklike contractions of a group of muscles, of variable regularity, synchrony, and symmetry, generally due to a central nervous system lesion.
[myo- + G. klonos, tumult]

myoclonus

/my·oc·lo·nus/ (mi-ok´lo-nus) shocklike contractions of a muscle or a group of muscles.myoclon´ic
essential myoclonus  myoclonus of unknown etiology, involving one or more muscles and elicited by excitement or an attempt at voluntary movement.
intention myoclonus  that occurring when voluntary muscle movement is initiated.
nocturnal myoclonus  nonpathological myoclonic jerks occurring as a person is falling asleep or is asleep.
palatal myoclonus  rapid rhythmic, up-and-down movement of one or both sides of the palate, often with ipsilateral synchronous clonic movements of the face, tongue, pharynx, and diaphragm muscles.

myoclonus

(mī-ŏk′lə-nəs)
n.
A sudden irregular twitching of muscles or parts of muscles, occurring in various brain disorders.

my′o·clon′ic (mī′ə-klŏn′ĭk) adj.

myoclonus

[mī′ōklō′nəs]
Etymology: Gk, mys muscle; + klonos, contraction
a spasm of a muscle or a group of muscles. myoclonic, adj.

myoclonus

Lightning movement Neurology A rapid involuntary nonrhythmic spasm that can occur spontaneously at rest, in response to sensory stimulation, or with voluntary movements; myoclonias are symptoms and not, per se, diseases a sui generis Management Clonazepam, valproic acid. See Baltic myoclonus, Posthypoxic ischemic myoclonus, Sleep-related myoclonus.
Myoclonus types
Essential myoclonus Idiopathic/non-progressive, eg restless legs syndrome
Physiologic myoclonus Associated with sleep jerks and hiccups
Epileptic myoclonus Associated with epilepsy and
Symptomatic myoclonus Associated with encephalopathy, spinocerebellar degeneration, metabolic, toxic, or viral encephalopathy or trauma  

my·oc·lo·nus

(mī'ok'lŏ-nŭs)
One or a series of shocklike contractions of a group of muscles, of variable regularity, synchrony, and symmetry, generally due to a central nervous system lesion.
[myo- + G. klonos, tumult]

myoclonus

A sudden, brief, involuntary muscle contraction usually causing a jerk of a limb. This occurs most commonly as a normal phenomenon in people half asleep but myoclonic contractions are a feature of EPILEPSY and of many other brain diseases.

Myoclonus

Involuntary contractions of a muscle or group of muscles.
Mentioned in: Anoxia

myoclonus

clonic spasm or twitching of a muscle or group of muscles

my·oc·lo·nus

(mī'ok'lŏ-nŭs)
One or a series of shocklike contractions of a group of muscles, of variable regularity, synchrony, and symmetry.
[myo- + G. klonos, tumult]

myoclonus,

n a spasm of muscle or group of muscles.

myoclonus

repetitive, rhythmic contractions of a group of skeletal muscles, persisting in sleep. The result of encephalitis or myelitis caused by distemper virus in dogs. Called also canine chorea, flexor spasm and tremor syndrome.

familial reflex myoclonus
a familial disease seen in young Labrador retriever puppies; myoclonus is followed by a generalized extensor rigidity and opisthotonos.
inherited congenital myoclonus
inherited as a recessive trait in Polled Hereford cattle; at birth affected calves are unable to stand because of myoclonic jerks to skeletal muscles in response to external stimuli; affected calves are not viable. One of the diseases originally classified together as neuraxial edema.
palatal myoclonus
a condition characterized by a rapid rhythmic movement of one or both sides of the palate.
References in periodicals archive ?
In our case, the patient had onset of seizures in her second decade of life which were drug resistant and developed myoclonus of bilateral lower limbs 9 years later.
Giant SEPs and long latency reflexes (C reflex) were reported in some patients with ADCME to support the cortical origin of myoclonus (5,7).
Four weeks later the pup was presented with myoclonus of muscles of head and dysphagia causing dehydaration and severe weight loss to the pup.
Although she did not return to her baseline by this point, her myoclonus, rigidity and visual hallucinations had resolved.
Moreover, there is evidence that abnormalities of 5-HT functions are related to the pathophysiology of diverse neurological conditions including Parkinson's disease, tardive dyskinesia, akathisia, dystonia, Huntington's disease, familial tremor, restless legs syndrome, myoclonus, Gilles de la Tourette's syndrome, multiple sclerosis, sleep disorders, and dementia.
Considering diagnosis and treatment in turn, they examine such topics as new onset focal and generalized epilepsy in an elderly patient, epileptic falling seizures associated with seizure-induced cardiac asystole in drug-resistant temporal lobe epilepsy, epileptic negative myoclonus in benign rolandic epilepsy, carefully combining medications for women with gastric reflux, and functional hemispherotomy for drug-resistant post-traumatic epilepsy.
Reflex myoclonus occurred at low trigger levels, and the patient clenched and bit constantly on the endotracheal tube.
Benign sleep myoclonus is very common but parents may come in concerned about these jerky movements.
Pergolide: treatment of choice in restless legs syndrome (RLS) and nocturnal myoclonus syndrome (NMS).
Piracetam relieves symptoms in progressive myoclonus epilepsy: a multicentre, randomised, double blind, crossover study comparing the efficacy and safety of three dosages of oral piracetam with placebo.
These events have included reports of lethargy, confusion, delirium, and coma--often with neurologic symptoms, such as myoclonus, expressive aphasia, seizures, or autonomic symptoms.