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Research Article Open Access
Objective: The purpose of this study was to evaluate, by using distortion product otoacoustic emission test, the action of Ginkgo biloba extract 761, which has a known antioxidant property, as a possible otoprotective against cisplatin induced hearing loss. This prospective and double blinded study was conducted on individuals that were to begin cisplatin treatment in a tertiary university center. They were randomized and allocated in two groups: control group (CG) (n = 07) receiving placebo and cisplatin and study group (SG) (n = 08) receiving Ginkgo biloba extract 761 (240 mg/day) and cisplatin.
Methods: This prospective study was conducted on individuals that were treated by cancer with cisplatin (CDDP) in a tertiary University center. Both groups were instructed to ingest the either placebo or Ginkgo biloba extract 761 before the first cisplatin dose. They were rated and followed up for approximately 90 days. The maximum cumulative cisplatin dosage was 300 mg/m2. The ototoxic effect was measured with distortion product otoacoustic emissions. Distortion product otoacoustic emissions were recorded before the first cisplatin cycle, 30, 60 and 90 days after the treatment. The average of the amplitude of the signals were calculated and used for comparisons between the groups.
Results: Comparisons were made between baseline measurements and those recorded after maximum cumulative CDDP dose. The control group showed smaller distortion product otoacoustic emissions mean amplitudes and smaller signal/noise ratio than the study group (p < 0.05).
Conclusion: Ginkgo biloba extract 761 probably has antioxidant properties, and might play otoprotective effect against cisplatin ototoxicity in these patients.
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Author(s): Mirela Alves Dias Andr Luiz Lopes Sampaio Alessandra Ramos Venosa Elienai de Alencar Meneses Carlos Augusto Costa Pires Oliveira
cisplatin, ginkgo biloba, otoacoustic emissions, spontaneous