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  • Title: Effect of changing pulse rate on profile parameters of perceptual thresholds and loudness comfort levels and relation to ECAP thresholds in recipients of the Nucleus CI24RE device.
    Author: Wesarg T, Battmer RD, Garrido LC, Dillier N, Garcia-Ibáñez L, Hey M, Macias AR, Irujo AH, Morsnowski A, Offeciers EF, Zarowski A, Pesch J, Rypkema G, Smoorenburg GF.
    Journal: Int J Audiol; 2010 Oct; 49(10):775-87. PubMed ID: 20666693.
    Abstract:
    The Nucleus CI24RE ‘Freedom' device offers higher stimulation rates and lower noise levels in action potential measurements (ECAPs) than previous devices. A study including ten European implant teams showed that the effect of changes in rate from 250 to 3500 pulses per second on tilt and curvature of the T and C profiles is insignificant. When changing rate one may change the levels at all electrodes by the same amount. Using an automated procedure ECAPs could be measured quickly and reliably at a noise level of only 1 microV, this did not result in improved correlations between the tilt and curvature parameters of the ECAP profiles and those of the T and C profiles. Average C levels appear to differ markedly among implant centers; a better assessment protocol is required. When increasing stimulus rate one should take into account that this requires higher pulse charges per second and more power consumption.
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