OBJECTIVES: To evaluate and compare the results of extratympanic and transtympanic electrocochleography (ECochg) in clinically diagnosed cases of Meniere's disease and controls. DESIGN: Prospective study on 20 clinically diagnosed cases of Meniere's disease and 20 age- and sex-matched controls. SETTING: Department of Otolaryngology, Head and Neck Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India. METHODS: Electrocochleography was performed by a transtympanic method using a stainless steel needle electrode kept on the promontory and by an extratympanic method whereby the needle electrode was inserted into bony canal skin. MAIN OUTCOME MEASURES: The various parameters compared were summation potential latency and amplitude, action potential latency and amplitude, and ratio of summation to action potential amplitude (SP/AP). RESULTS: A significant difference in summation to action potential amplitude ratio (SP/AP) between cases and controls was obtained by both methods. Using 0.29 as a cutoff for SP/AP, the transtympanic method yielded a sensitivity of 100% and a specificity of 90%, whereas the extratympanic method showed corresponding values of 90% and 80%, respectively. CONCLUSION: Contrary to previous studies, extratympanic ECochg is shown to be an efficacious and a less invasive test as compared with the transtympanic method and can be easily performed in clinical practice.
OBJECTIVES: To evaluate and compare the results of extratympanic and transtympanic electrocochleography (ECochg) in clinically diagnosed cases of Meniere's disease and controls. DESIGN: Prospective study on 20 clinically diagnosed cases of Meniere's disease and 20 age- and sex-matched controls. SETTING: Department of Otolaryngology, Head and Neck Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India. METHODS: Electrocochleography was performed by a transtympanic method using a stainless steel needle electrode kept on the promontory and by an extratympanic method whereby the needle electrode was inserted into bony canal skin. MAIN OUTCOME MEASURES: The various parameters compared were summation potential latency and amplitude, action potential latency and amplitude, and ratio of summation to action potential amplitude (SP/AP). RESULTS: A significant difference in summation to action potential amplitude ratio (SP/AP) between cases and controls was obtained by both methods. Using 0.29 as a cutoff for SP/AP, the transtympanic method yielded a sensitivity of 100% and a specificity of 90%, whereas the extratympanic method showed corresponding values of 90% and 80%, respectively. CONCLUSION: Contrary to previous studies, extratympanic ECochg is shown to be an efficacious and a less invasive test as compared with the transtympanic method and can be easily performed in clinical practice.
Authors: A Vassiliou; P V Vlastarakos; P Maragoudakis; D Candiloros; T P Nikolopoulos Journal: Ann Indian Acad Neurol Date: 2011-01 Impact factor: 1.383
Authors: Gerd M E Claes; Michel Wyndaele; Claudia F J De Valck; Jos Claes; Paul Govaerts; Floris L Wuyts; Paul H Van de Heyning Journal: Eur Arch Otorhinolaryngol Date: 2008-01-03 Impact factor: 2.503
Authors: Pauliana Lamounier; Débora Aparecida Gobbo; Thiago Silva Almeida de Souza; Carlos Augusto Costa Pires de Oliveira; Fayez Bahmad Journal: Braz J Otorhinolaryngol Date: 2014-08-27