パーキンソン病患者のアブミ骨筋反射の検討 -A preliminary report-
1989 年 16 巻 1 号 p. 79-85
詳細
1989 年 16 巻 1 号 p. 79-85
The stapedial reflex was studied in humans by impedance audiometry. Contralateral reflexes obtained from 28 patients with Parkinson's disease or syndrome (PA) (52 ears of which hearing level were within 40dB) and 10 controls (20 ears) without any disorders of central nervous system higher than medulla were investigated.
A 500Hz pure tone was used as acoustic stimulus. After reflex thresholds were determined, decay tests were performed. In two ears (two PA patients) no reflex was obtained, and in two ears (one PA patient) decay test showed positive. These patients were excluded for the following examinations. Then 10 reflexes were averaged and recorded with a 500Hz pure tone stimulus of 10dB above the threshold for 500msec (rise/fall time=10msec). PA patients showed longer relaxation time and smaller amplitude.
The authors conclude that the prolongation of relaxation time is characteristic for PA patients. And the authors assume that the prolongation may be attributed to the increased activity of a long latency pathway of the stapedial reflex.
