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Arch Otolaryngol Head Neck Surg. 1997 Jun;123(6):573-7.

Inherited nonsyndromic hearing loss. An audiovestibular study in a large family with autosomal dominant progressive hearing loss related to DFNA2.

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1
Department of Otorhinolaryngology, University Hospital Nijmegen, the Netherlands.

Abstract

OBJECTIVE:

To study nonsyndromic progressive sensorineural hearing loss (SNHL) with significant linkage to the DFNA2 locus on chromosome 1p in a Dutch kindred.

DESIGN:

A 6-generation family with 194 family members was studied. Of the presumably affected persons, 43 were examined in detail to obtain audiograms and 37 underwent vestibulo-ocular examination.

RESULTS:

Regression analysis showed significant and equal linear progression in SNHL with age (by about 1 dB per year) at all frequencies. Offset values were close to zero at the low frequencies (0.25, 0.5, and 1 kHz) but increased systematically with the frequency. It is likely that they represent congenital high-frequency SNHL: about 15 dB at 2 kHz, 30 dB at 4 kHz, and 50 dB at 8 kHz. Bilateral caloric weakness was not observed. A significant finding was that 25% to 35% (depending on the exclusion criteria) of the patients showed an increased vestibulo-ocular reflex (hyperreactivity) as measured by rotatory responses. Forty-one patients showed significant linkage to the 1p locus.

CONCLUSIONS:

Including the present family, 4 families have been reported to show linkage to chromosome 1p. Statistical analysis of the audiological data shows a progression of 1 dB per octave per year in this type of progressive SNHL.

PMID:
9193215
[Indexed for MEDLINE]
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