Fig 1.
STROBE flow diagram of patient selection.
Table 1.
Patient demographic information.
Fig 2.
EABRs obtained with the cochlear protocol (CP) for patient CH7.
For electrode combinations with wide stimulation arcs (e.g., 22–4, 3–20), the waveforms have a 1- or 2-peak morphology more frequently than a 3-peak morphology. For electrode combinations with narrower stimulation arcs (e.g., 11–12, 8–3), the waveforms have a 3-peak morphology when associated with auditory sensation. Stimulation artifacts present in the first 0.5 ms of recording have been eliminated. el, electrodes.
Fig 3.
EABRs obtained with the modified protocol (MP) for patient CH7.
The electrode combinations have narrower stimulation arcs compared to CP (Fig 2) by reducing the electric field and interactions between electrodes, which allows for better interpretation of electrode position. In general, there are a greater number of 3-peak waveforms than with CP (Fig 2). Stimulation artifacts present in the first 0.5 ms of recording have been eliminated. el, electrodes.
Table 2.
Peaks characterization of the EABR waveforms recorded with the two different stimulation protocols.
Table 3.
Mean, standard deviation (Std), minimum (Min), and maximum (Max) number of viable electrodes estimated during surgery and at ABI activation.
Table 4.
Number of viable electrodes estimated from EABRS and at ABI activation, as well as perceptual results.
Fig 4.
Median percentage and 95% confidence interval of perceptual results.
A: Probability of closed-set word identification (Level 2) as a function of the number of active electrodes, across all ABI patients. The percentages increase non-linearly and the 95% confidence intervals narrow as the number of active electrodes increases. B: Probability of open-set word and sentence recognition (Level 3) as a function of the number of active electrodes, across all ABI patients. While the median percentage increases slowly with the number of active electrodes, the 95% confidence interval remains similarly wide across the number of electrodes, indicating considerable inter-subject variability. #, number.