PMC4676574_01
Mean impedance levels over time across all electrodes
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F1
As seen in Figure 1, impedance values were mostly stable over the 7 years post-operatively prior to the development of MED, but then shifted to significantly higher levels during active MED.
Mean impedance levels over time as a function of apical versus basal electrodes
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F2
Interestingly, as noted in Figure 2, the apical-most electrodes were observed to have had the most significant impedance changes.
Mean comfort levels over time across all electrodes
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F3
During the period of MED, there was an increase in the average comfort levels (M-levels) to achieve sufficient loudness (Figure 3).