asterixis


Also found in: Wikipedia.

asterixis

 [as″ter-ik´sis]
a motor disturbance marked by intermittent lapses of an assumed posture as a result of intermittency of sustained contraction of groups of muscles; called liver flap because of its occurrence in coma associated with liver disease, but also observed in other conditions.
 To elicit asterixis (flapping tremor) the patient extends the arm, dorsiflexes the wrist, and extends the fingers. The hand is observed for rapid, nonrhythmic extensions and flexions. From Ignatavicius and Workman, 2002.

as·ter·ix·is

(as'ter-ik'sis),
Involuntary jerking movements, especially in the hands, best elicited by having the patient extend the upper limb, dorsiflex the wrists, and spread the fingers; results from lapses of sustained posture; seen primarily with various metabolic and toxic encephalopathies, especially hepatic encephalopathy.
Synonym(s): flapping tremor
[G. a- priv. + stērixis, fixed position]

asterixis

/as·ter·ix·is/ (as″ter-ik´sis) a motor disturbance marked by intermittent lapses of an assumed posture as a result of intermittency of sustained contraction of groups of muscles; called liver flap because of its occurrence in hepatic coma, but observed also in other conditions.

asterixis

[as′tərik′sis]
Etymology: Gk, a, sterixis, not fixed position
a hand-flapping tremor, often accompanying metabolic disorders. The tremor is usually induced by extending the arm and dorsiflexing the wrist. Asterixis is seen frequently in hepatic encephalopathy. Also called flapping tremor, liver flap.
Hepatology An involuntary jerking tremor of wide amplitude elicited upon dorsiflexion of the pronated wrist and spreading of extended fingers; in full-blown flapping tremors, there is abrupt flexion of the fingers at the metacarpophalangeal joint and flexion of the wrist, occurring asynchronously with each other every few seconds, due to exaggerated reflexes; bilateral flapping tremor is quasi-pathognomonic for metabolic, often alcohol-related, hepatic encephalopathy seen in end-stage—post-fibrotic—cirrhosis due to increased blood ammonia
Neonatology Coarse bilateral tremors, accompanied by limb rigidity, hyperreflexia, resistance to flexion and extension, seen in infants born to heroin-addicted mothers who undergo ‘withdrawal’ at birth

asterixis

Flapping tremor Neurology An exaggerated muscle tremor characterized by involuntary jerking of the hand in flexion and extension, classically seen in advanced liver disease and hepatic encephalopathy.

as·ter·ix·is

(as-tĕr-ik'sis)
Involuntary jerking movements, especially in the hands, due to arrhythmic lapses of sustained posture; seen primarily with metabolic and toxic encephalopathies, especially hepatic encephalopathy.
Synonym(s): flapping tremor.
[G. a- priv. + stērixis, fixed position]

asterixis

A recurrent flapping tremor of the arms, like the action of a bird's wings. Asterixis is characteristic of the brain disorder associated with liver failure—hepatic encephalopathy.
References in periodicals archive ?
Seizures, nonconvulsive status epilepticus, encephalopathy, coma, asterixis, neuromuscular excitability, and myoclonia have been reported in patients treated with ceftazidime, particularly in the setting of renal impairment.
Examination disclosed no scleral icterus, ascites, organomegaly, asterixis, or spider angiomata.
Generalised muscle weakness, asterixis and sensory-motor peripheral neuropathy.
Major symptoms include clouding of consciousness, disorientation of thoughts, illusions, hallucinations, fluctuating levels of consciousness, dysphasia, dysarthria, tremors, asterixis in hepatic encephalopathy and uremia.
Asterixis and encephalopathy following metrizamide myelography: investigations into possible mechanisms and review of the literature.
The routine checking of these analytes is unnecessary and not recommended, but if symptoms such as nausea, vomiting, and confusion occur--with or without tremor, asterixis, or abdominal pain--it may be reasonable to measure serum ammonia and pancreatic enzymes.
Neurologic impairment was also evaluated with the Asterixis score, which ranges from grade 0 (no tremors) and grade 1 (rare flapping motions) to grade 2 (occasional, irregular flaps), grade 3 (frequent flaps), and grade 4 (almost continuous flapping motions).
There was mild ptosis of the right eye, normal cranial nerves, mild asterixis, and hand weakness.
He presented in a very similar fashion to the first case; the workup was negative except for asterixis, myoclonus, and the presence of agitation.
These symptoms are followed by psychiatric conditions such as anxiety and depression, as well as by motor problems, including motor incoordination and a type of flapping tremor of the hands called asterixis.
Negative myoclonus, also known as asterixis, is characterized by a sudden involuntary relaxation, rather than contraction, of a muscle.
Breakthrough HE was defined as an increase to Conn Score (CS) of 2 or greater or CS and asterixis grade increase of 1 each if baseline CS equals 0.