Int Arch Otorhinolaryngol 2014; 18 - a2409
DOI: 10.1055/s-0034-1388736

Outcomes in Patients with Long Time of Hearing Deprivation

Ana Cristina H. Hoshino 1, Ana Tereza Matos Magalhães Dherte 1, Maria Valéria Scmidt Goffi Gomez 1, Mariana Reis 1, Ricardo Ferreira Bento 1, Robinson Koji Tsuji 1
  • 1Hospital das Clínicas da Faculdade de Medicina, Universidade de São Paulo (HC-FM-USP)

Introduction: Patients with longer duration of deafness may have worse prognosis due to possible ganglion cell survival and deafferentation. Is the presence of intraoperative electrical evoked compound action potentials (ECAP) a positive prognosis predictor in these cases?

Objectives: To identify differences between intraoperative ECAP in patients with more than 10 years and less than 5 years of durations of deafness.

Methods: Adults, post lingually, were randomly selected. Exclusion criteria included bilateral implanted, incomplete electrode insertion, neural etiologies, meningitis, and malformed cochleae. They were divided into two groups according to deafness duration: GI: more than 10 years and GII: less than 5 years. Intraoperative ECAP in at least three electrodes and speech perception performance after 1 year of device use were compared.

Results: The sample was 54 patients, 26 patients implanted with Nucleus 24RE (Cochlear) and 28 implanted with Sonata TI100 (Medel) devices. In all, 47 patients (89%) showed present intraoperative ECAP. Among the Nucleus-implanted patients with present intraoperative ECAP (GI = 12, GII = 11), 58% of GI and 79% of GII showed more than 80% of open set recognition. Among the Sonata-implanted patients with present intraoperative ECAP (GI = 9 and GII = 15), 63.6% of GI and 81.3% of GII presented more than 80% of open set recognition.

Discussion and Conclusions: Patients over 10 years of deprivation showed present intraoperative ECAP, suggesting ganglion cell survival. However, their performance in speech recognition after 1 year of CI use was lower than those who had shorter time of auditory deprivation, suggesting auditory central nervous system deprivation.