[Effects of poria cocos on ototoxicity induced by kanamycin in guinea-pigs].

In order to prevent the ototoxicity of kanamycin (KM), the effects of Poria Cocos (PC) on the ototoxicity induced by KM in guinea-pigs was observed by infusing the PC decoction into the guinea-pigs with comparing the difference in the general intoxicating symptom, prayer's reflex (PR) threshold, brainstem auditory evoked potentials (BAEPs) and the absence rate of outer hair cells in the first turn of cochlea. The results suggested that the ototoxicity of KM was retarded by giving the PC decoction. On 7th day after given KM, PR threshold of 4,6,8 kHz in the medicated group and control group were 4.7 +/- 1.5 dB, 5.7 +/- 2.4 dB, 2.7 +/- 1.2 dB and 10.5 +/- 3.2 dB, 12.1 +/- 3.7 dB, 8.5 +/- 2.7 dB respectively. BAEPs threshold on 13th day given KM raised 22.7 +/- 9.7 dB in the medicated group and 51.3 +/- 14.4 dB in control group. The absence rate of outer hair cells in first turn of cochlea were 39.4% and 67.4% respectively. The results suggested that PC might be antagonistic to the ototoxicity of KM in guinea-pigs.