myoclonus

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Related to Myoclonic jerk: Hypnic jerk

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 ?
The treatment of myoclonic jerks in acute PHM is difficult (generally requiring intravenous anaesthetic agents) and of questionable usefulness besides the 'cosmetic' effect.
Our patient met Masters et al's (8) criteria for probable CJD, such as inappropriate behavior, ataxia, myoclonic jerks, akinetic mutism, and rapid decline in cognitive function during a 3-month period.
Welty said that the increase in myoclonic jerks seen in the study is possibly related to the fact that so many of the patients were having their valproate tapered or discontinued.
The latter condition presents clinically with a rapidly dementing illness associated with myoclonic jerks.
The movement disorder evolved from random myoclonic jerks of all four extremities to drop attacks many times a day, during which, while walking or standing, he would suddenly fall to the floor.
Within several months, the psychological symptoms are compounded by neurologic ones, most often consisting of myoclonic jerks.
Before long the baby was having hundreds of daily myoclonic jerks, prolonged seizures and numerous trips to the emergency room.
The girl's myoclonic jerks stopped and she began to respond to speech and physical therapy.
On day 2 of the ifosfamide therapy, the patient became sleepy and confused; he had generalized myoclonic jerks, muscle spasticity, and asterixis.
Polymyoclonus causes myoclonic jerks that can occur randomly throughout the body.