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Hyperkinetic movement disorders: Clinical
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Kinetic tremors are simple - if they occur uniformly throughout a voluntary movement - intentional - if it worsens as the affected body part approaches the target - and task-specific - if it occurs during a specific task, like writing.
Postural tremors occur when the individual is in a specific position, such as extending their arms out.
One very specific type of tremor is called a flapping tremor, or asterixis, and it’s induced when a person fully extends their wrists. In a flapping tremor a person will flap their wrists, like a bird flapping it’s wings. It’s a classic sign of a metabolic disorder, like hepatic encephalopathy in liver disease, uremic encephalopathy in kidney disease, and carbon dioxide retention in lung disease.
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