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Original Article

Magnitude and Pattern of Inner and Outer Hair Cell Loss in Chinchilla as a Function of Carboplatin Dose

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Pages 301-311 | Received 12 Nov 1996, Accepted 10 Mar 1997, Published online: 07 Jul 2009
 

Abstract

We examined the relationship between carboplatin dose and pattern of IHC and OHC loss in five groups of chinchillas treated with carboplatin: (I) single dose, 38 mg/kg, (II) double dose, 38 mg/kg, (III) double dose, 63 mg/kg, (IV) double dose, 75 mg/kg, and (V) double dose, 100 mg/kg. The pattern of IHC loss was relatively uniform along the length of the cochlea with all doses. Average IHC loss increased from approximately 20 per cent in group I to approximately 100 per cent in groups III, IV and V. Average OHC loss was small or negligible in groups I, II, III and IV; only group V consistently showed large (>40 per cent) OHC losses. OHC loss progressed along a base-to-apex gradient. The dose of carboplatin which reliably destroyed OHCs was four to five times greater than that needed to damage IHCs.

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