S235 – Diagnostic Test Validation: CHAMP in Endolymphatic Hydrops

Abstract

Objectives The Cochlear Hydrops Analysis Masking Procedure (CHAMP) has been reported with a high sensibility and specificity for the diagnosis of endolymphatic hydrops (ELH). Nevertheless, a complete validation of CHAMP with precise methods has not been done. Our objectives: To determine whether CHAMP has a diagnostic value in patients with definite, probable/possible diagnosis of Meniere's disease or endolymphatic hydrops, based on the criteria of the AAO-HNS. Methods Prospective validation study for a diagnostic test: phase II. Latency of wave V was assessed using CHAMP. We classified subjects in 5 groups: 1-Definite ELH, 2-Probable ELH, 3-Possible ELH, 4-subjects with other otovestibular symptoms, 5-normal hearing subjects. We included cases (groups 1–4) with an episode of vertigo with duration equal or longer than 20 minutes, with or without other otovestibular symptoms. Results We included 67 cases (132 ears). 38 cases (76 ears) completed the follow up and their results are presented. In group 1, the sensibility of CHAMP was 43% and its specificity was 100%. In groups 2–3, the sensitivity was 20% and the specificity 100%, with 0% false positive and 80% false negative results. Other indicators of validity for this diagnostic test are presented. Conclusions CHAMP has a high specificity and low sensibility for the diagnosis of ELH when the delay in wave V latency is used. Future studies may assess the relationship between wave amplitudes to improve the clinical value of CHAMP.