What is the abnormal finding observed during the asterixis test?

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Study for the Parkinson’s Disease Exam. Engage with detailed flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

What is the abnormal finding observed during the asterixis test?

Explanation:
During the asterixis test, the abnormal finding is a flapping of the hands, called asterixis. When the patient holds the wrists and hands extended, they exhibit brief, irregular flexion-extension movements—the classic “liver flap”—due to a sudden lapse in sustained muscle tone (a negative myoclonus). This sign points to metabolic encephalopathy, most commonly hepatic failure, rather than a true tremor from a movement disorder. It’s distinct from tremors seen in Parkinsonism (tremor at rest) or cerebellar disease (intention tremor), which have different timing and contexts.

During the asterixis test, the abnormal finding is a flapping of the hands, called asterixis. When the patient holds the wrists and hands extended, they exhibit brief, irregular flexion-extension movements—the classic “liver flap”—due to a sudden lapse in sustained muscle tone (a negative myoclonus). This sign points to metabolic encephalopathy, most commonly hepatic failure, rather than a true tremor from a movement disorder. It’s distinct from tremors seen in Parkinsonism (tremor at rest) or cerebellar disease (intention tremor), which have different timing and contexts.

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