Abstract:
OBJECTIVE:Click and galvanic stimulations of vestibular-evoked myogenic potential (c-VEMP and g-VEMP) were applied to measure the interaural difference (IAD) of saccular responses in patients with acute low-tone sensorineural hearing loss (ALHL). This study intended to explore the relationship between saccular asymmetry and final hearing recovery. We hypothesize that greater extent of saccular dysfunction may be associated with lesser hearing recovery. DESIGN:Twenty-one patients with unilateral ALHL were prospectively enrolled to receive c-VEMP and g-VEMP tests in a random sequence. The IAD of the saccular responses for each patient was measured using three parameters-the raw and corrected amplitudes of c-VEMP, and corrected c-VEMP to g-VEMP amplitude ratio (C/G ratio). The IAD for each parameter was classified as depressed, normal, or augmented by calculating the difference between the affected and unaffected ears and dividing by its sum for both ears. RESULTS:After 3 consecutive months of oral medication and follow-up, 19 patients displayed a hearing recovery of >50%; only two had a recovery of <50%. The significant correlation between the IAD of corrected C/G ratios and hearing recovery demonstrated that subjects with depressed responses had a worse hearing outcome (percent recovery: 51% [45-80%], median [minimum-maximum]), compared with those with normal responses, who exhibited the best recovery (87% [56-100%]), whereas patients with augmented response showed an intermediate recovery (67% [54-100%]; p = 0.02, Kruskal-Wallis test). On the contrary, the raw and corrected amplitudes of c-VEMP did not reveal a significantly different hearing recovery among the three groups of saccular responses. CONCLUSIONS:The extent of saccular dysfunction in ALHL might be better explored by combining the results of c-VEMP and g-VEMP. Outcome analysis indicated that the corrected C/G ratio might be a promising prognostic factor for hearing recovery in ALHL.
journal_name
Ear Hearjournal_title
Ear and hearingauthors
Wang CT,Fang KM,Young YH,Cheng PWdoi
10.1097/AUD.0b013e3181c5b743subject
Has Abstractpub_date
2010-04-01 00:00:00pages
289-95issue
2eissn
0196-0202issn
1538-4667journal_volume
31pub_type
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