Hybrid 10 clinical trial: Preliminary results

Bruce J. Gantz, Marlan R. Hansen, Christopher W. Turner, Jacob J. Oleson, Lina A. Reiss, Aaron J. Parkinson

Research output: Contribution to journalArticlepeer-review

195 Scopus citations


Acoustic plus electric (electric-acoustic) speech processing has been successful in highlighting the important role of articulation information in consonant recognition in those adults that have profound high-frequency hearing loss at frequencies greater than 1500 Hz and less than 60% discrimination scores. Eighty-seven subjects were enrolled in an adult Hybrid multicenter Food and Drug Administration clinical trial. Immediate hearing preservation was accomplished in 85/87 subjects. Over time (3 months to 5 years), some hearing preservation was maintained in 91% of the group. Combined electric-acoustic processing enabled most of this group of volunteers to gain improved speech understanding, compared to their preoperative hearing, with bilateral hearing aids. Most have preservation of low-frequency acoustic hearing within 15 dB of their preoperative pure tone levels. Those with greater losses (>30 dB) also benefited from the combination of electric-acoustic speech processing. Postoperatively, in the electric-acoustic processing condition, loss of low-frequency hearing did not correlate with improvements in speech perception scores in quiet. Sixteen subjects were identified as poor performers in that they did not achieve a significant improvement through electric-acoustic processing. A multiple regression analysis determined that 91% of the variance in the poorly performing group can be explained by the preoperative speech recognition score and duration of deafness. Signal-to-noise ratios for speech understanding in noise improved more than 9 dB in some individuals in the electric-acoustic processing condition. The relation between speech understanding in noise thresholds and residual low-frequency acoustic hearing is significant (r = 0.62; p < 0.05). The data suggest that, in general, the advantages gained for speech recognition in noise by preserving residual hearing exist, unless the hearing loss approaches profound levels. Preservation of residual low-frequency hearing should be considered when expanding candidate selection criteria for standard cochlear implants. Duration of profound high-frequency hearing loss appears to be an important variable when determining selection criteria for the Hybrid implant.

Original languageEnglish (US)
Pages (from-to)32-38
Number of pages7
JournalAudiology and Neurotology
Issue numberSUPPL. 1
StatePublished - Apr 2009
Externally publishedYes


  • Electric-acoustic stimulation
  • Hearing loss
  • Hearing preservation
  • Sensorineural
  • Short electrode

ASJC Scopus subject areas

  • Physiology
  • Otorhinolaryngology
  • Sensory Systems
  • Speech and Hearing


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