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.
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.
Wesarg
Thomas
T
Universitätsklinikum Freiburg, HNO-Klinik, Implant Centrum Freiburg, Germany.
Battmer
Rolf-Dieter
RD
Garrido
Laura Cavallé
LC
Dillier
Norbert
N
Garcia-Ibáñez
Luis
L
Hey
Matthias
M
Macias
Angel Ramos
AR
Irujo
Alicia Huarte
AH
Morsnowski
Andre
A
Offeciers
Erwin F
EF
Zarowski
Andrzej
A
Pesch
Joerg
J
Rypkema
Gerben
G
Smoorenburg
Guido F
GF
D000200:Action Potentials; D000328:Adult; D000368:Aged; D001307:Auditory Perception; D001309:Auditory Threshold; D001331:Automation; D003054:Cochlear Implants; D004056:Differential Threshold; D004558:Electric Stimulation / Q000379:methods; D006801:Humans; D008144:Loudness Perception; D008875:Middle Aged; D009622:Noise; D025341:Principal Component Analysis; D055815:Young Adult