Cochlear Implants and Hearing Preservation (Advances in by Paul Van de Heyning, Andrea Kleine Punte

By Paul Van de Heyning, Andrea Kleine Punte

Electrical acoustic stimulation (EAS) combines electrical stimulation within the mid to high-frequency areas with acoustic stimulation within the low-frequency variety with the purpose to maintain residual low-frequency listening to after cochlear implantation, which jointly fairly improves speech knowing, pitch discrimination and tune appreciation. during this quantity, the main skilled scientific teams proportion their realizing of using EAS in adults and kids. It deals an in-depth audiological research regarding deciding upon, getting ready and rehabilitating EAS sufferers. issues corresponding to lifeless region evaluation, psychophysics of low-frequency listening to, electric-acoustic interplay, speech algorithms, song conception, in addition to becoming and the patient's reputation are mentioned. Introductory chapters - illustrated with unparalleled color pictures - on cochlear neural reserves, molecular biology and high-technological electrode improvement concentrate on the fundamental clinical EAS examine. each ENT expert, audiologist, speech therapist and scientist attracted to internal ear pathology, excited by cochlear implantation or facing the remedy or surgical procedure of the internal ear will enjoy the insights and stories of the world's major specialists who contributed to this booklet.

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Extra info for Cochlear Implants and Hearing Preservation (Advances in Oto-Rhino-Laryngology, Vol. 67)

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The original 6-mm device was lengthened to 10 mm with the most apical electrode at approximately 2,500–3,000 Hz according to the Greenwood place/frequency map. The tip of the electrode curves into the ascending segment but does not extend to the upper basal turn of the Rask-Andersen и Liu и Linthicum Parvalbumin Connexin 30 DAPI b cochlea. The most innervated region of the human cochlea is the upper basal and lower middle turns (fig. 5c) [35]. An electrode reaching one turn is close to the most densely innervated areas, which may be advantageous in case of inadvertent deafness caused by EAS surgery.

9 Roland PS, Wright CG, Isaacson B: Cochlear implant electrode insertion: the round window revisited. Laryngoscope 2007;117:1397–1402. 10 Linder T, Schlegel C, DeMin N, van der Westhuizen S: Active middle ear implants in patients undergoing subtotal petrosectomy: new application for the Vibrant Soundbridge device and its implication for lateral cranium base surgery. Otol Neurotol 2009;30:41–47. 11 Eshraghi A, Jolly C, Balkany T: Smallfenestra cochleostomy for MED-EL electrode. Cochlear Implants Int 2004;5:71– 75.

6a, b, 7). Electrodes reaching the second turn may therefore stimulate neurons coding for lower frequencies 22 a than represented by their location. This may imply that selective stimulation of neurons coding for particular frequencies is more intricate in the apical region than in the basal region. This condition may have a bearing on the EAS strategy since the use of acoustic stimulation in the low-frequency region may provide more temporal fine structure hard to obtain through electric stimulation.

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