Hyperekplexia (`exaggerated surprise`) is a neurologic disorder classically characterised by pronounced startle responses to tactile or acoustic stimuli and hypertonia. The hypertonia may be predominantly truncal, attenuated during sleep and less prominent after a year of age. Classic hyperekplexia is caused by genetic mutations in a number of d.....
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http://en.wikipedia.org/wiki/Hyperekplexia
Type: Term Pronunciation: hī′pĕr-ek-plek′sē-ă Definitions: 1. A hereditary disorder in which there are pathologic startle responses, protective reactions to unanticipated, potentially threatening, stimuli of any type, particularly auditory; the stimuli induce often widespread and violent sudden contractions of the he...
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http://www.medilexicon.com/medicaldictionary.php?t=42293
Hyperekplexia: A genetic disorder also known as hyperexplexia in which babies have an exaggerated startle reflex (reaction). This disorder was not recognized until 1962 when it was described by Drs. Kok and Bruyn as a disease with the onset at birth of hypertonia (stiffness), exaggerated startle response, strong brain-stem reflexes (especially head...
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http://www.medterms.com/script/main/art.asp?articlekey=8305
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