Clinical trial of a multiple‐channel cochlear prosthesis: An initial study in four patients with profound total hearing loss

The clinical trial of a multiple‐channel cochlear prosthesis was undertaken in four patients with postlingual deafness and profound total hearing loss. The results of open‐set speech tests confirmed that, using electrical stimulation alone, one patient could have a meaningful conversation without resorting to lipreading (for example, this patient uses the prosthesis to converse with her husband on the telephone). The results of closed‐set speech tests also suggested that a multiple‐channel stimulator is more effective than a single‐channel one in conveying speech information. The cochlear prosthesis was especially effective in all four patients when it was used in conjunction with lipreading, and speech‐tracking tests showed that the patients could combine the information obtained from both electrical stimulation and lipreading.

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