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 ?
Tuberous sclerosis classically presents during infancy with seizures or myoclonic jerks.
In this study there are only two cases of myoclonic jerks, one is from young age i.
10] Our patient had myoclonic jerks that disappeared after 2 months of treatment with vitamin [B.
Myoclonic jerks reported as unilateral nocturnal generalized tonic-clonic seizures and focal EEG abnormalities are other factors contributing to misdiagnosis.
Ketamine can give rise to myoclonic jerks or involuntary movements.
Within one minute of completion of infusion, myoclonic jerks disappeared, returning 15 minutes later.
If a patient experiences myoclonic jerks from opioid toxicity, it's useful to administer a liter or two of fluids to flush out some of the drug and its metabolites.
The latency and duration of myoclonic jerks, as well as the percentage of protection against incidence of seizure and mortality were recorded (Hosseinzadeh and Khosravan, 2002; Hosseinzadeh and Madanifard, 2000).
The three seizure types are typically absence, myoclonic jerks and tonic-clonic seizures.
Juvenile myoclonic epilepsy (JME) is a heritable nonprogressive syndrome characterized by seizures and bilateral myoclonic jerks usually of the upper extremities.