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First clinical results Crystalis XDP coding strategy including multiband output compression function
Montava M. , Gnansia D. , Saai S. , Guevara N. , Philippon B. , Bébear J.-P. , Lavielle J.-P.
Marseille Nord University Hospital, ENT Department, Marseille, France, 2Neurelec - Oticon Medical, Vallauris, France, 3Nice University
Hospital, Nice, France, 4Bordeaux University Hospital, Bordeaux, France, 5Marseille Nord University Hospital, Marseille, France
Aim: The goal of the present study is to present the first results from clinical validation data of Crystalis XDP
coding strategy, available for latest Neurelec Saphyr Neo collection speech processors.
Material and methods: 20 cochlear implant recipients were included (10 Digisonic SP users, 10 Digisonic SP
Binaural users). Speech perception was assessed through speech in quiet and in noise tests using multitalker
babble. Pure-tone thresholds were also assessed. A questionnaire was used to evaluate sound quality and
everyday life listening situations. Subjects were tested immediately, then after one month of use.
Results: Crystalis XDP did not show any modification of pure tone thresholds, however important improvement
was observed for speech in babble noise after one month of use. Speech in quiet also showed significant
improvement at lowest and highest intensities for different XDP configurations. Improvements were more salient
for binaural users. Listening quality testing for noise annoyance and overall preference also found significant
Conclusions: Crystalis XDP has shown significant speech perception and quality improvements, it is an
adapted solution for patients experiencing difficulties in noisy situations. More investigation will be needed to fine
tune the fitting procedure with use of both functionalities simultaneously activated, optimal results are expected
in that case.