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  • Title: [Electrocochleography possibilities in the differential diagnosis of hydrops and neural hearing loss].
    Author: Marangos N, Mausolf A, Ziesmann B.
    Journal: HNO; 1990 Feb; 38(2):56-8. PubMed ID: 2318669.
    Abstract:
    Enhancement of the click-evoked summating potential causing a pathological summation to compound action potential ratio (SP/CAP) in patients with endolymphatic hydrops has been described by several groups. An increased SP/CAP ratio is found also in some patients with a tumour of the cerebellopontine angle. The study of further parameters of the SP/CAP complex, such as the CAP latency and the width of the complex, permit an electrocochleographic differentiation between both forms of hearing loss. The N2 amplitude showed no diagnostic significance.
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