Hyperexplexia: an inherited disorder of the startle response.

Abstract:

:A family is presented with hyperexplexia, a rare autosomal dominant neurological disorder. Affected individuals manifest flexor hypertonia and hypokinesia during infancy. Later and throughout life, the condition is characterized by exaggerated involuntary myoclonic startle reactions, which on occasion result in falling. There are also marked nocturnal myoclonic jerks. Many family members have had congenital hip dislocations and inguinal hernias. Pre- and postnatal hypertonia is proposed as the cause for these problems. The nature and location of central nervous system dysfunction in hyperexplexia was investigated using electroencephalographic and brainstem-evoked response techniques. A dysfunction of cortical inhibition of the brainstem-mediated startle response is discussed as a possible pathogenic mechanism. Accurate diagnosis of this disorder is important in order to provide appropriate counseling and to initiate effective treatment.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Morley DJ,Weaver DD,Garg BP,Markand O

doi

10.1111/j.1399-0004.1982.tb01393.x

subject

Has Abstract

pub_date

1982-06-01 00:00:00

pages

388-96

issue

6

eissn

0009-9163

issn

1399-0004

journal_volume

21

pub_type

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