三半规管阻塞与迷路切除术后前庭功能动态变化

目的 :比较豚鼠三半规管阻塞与迷路切除术后前庭功能代偿的异同。材料与方法 :将 15只健康豚鼠分为 2组 ,其中 8只豚鼠行右侧三半规管阻塞术 (triple semicircular canal occlusion,TCO) ,7只豚鼠行右侧迷路切除术(labyrinthectomy,L E) ,于术后一个月内观察豚鼠行为学及眼震电图 (ENG)的动态变化。结果 :发现术后第 1天两组均出现自发性眼震 ,正弦摆动刺激术侧时未引出诱发性眼震 ,头向右侧偏斜并沿地面垂直轴向术侧旋转 ;L E组却出现翻滚现象。术后第 3、5、10、15、30天正弦摆动眼震试验 ,两组豚鼠术侧眼震均随时间的推移逐渐恢复 ,TCO组于 15天左右向眼震基本恢复对称 ,而 L E组至术后 30天仅摆动幅度 12 0°、15 0°、180°左右向眼震基本对称 ,摆动幅度为 6 0°、90°双向眼震反应差异仍有显著性意义 (P <0 .0 5 ) ;另外 ,L E组有 3只豚鼠仍存在头偏。结论 :TCO组要比 L E组动物恢复快 ,建立代偿和失平衡时间短

Vestibular compensation after triple semicircular canal occlusion and labyrinthectomy

Objective:To evaluate the difference of vestibular compensation between triple semicircular canal occlusion(TCO) and labyrinthectomy(LE)in guinea pigs.Material and Methods:TCO was performed on 8 guinea pigs,while LE was did on 7 guinea pigs.Behavior and ENG were recorded in detail preoperatively and repeatedly up to one month postoperatively according to the experiment design.Results:There was spontaneous nystagmus towards the nonoperated side on the first postoperative day and nystagmus absence during sinusoidal angular acceleration stimuli on the operated side was observed in all the animals.All the animals displayed head tilt towards the operated side (right)and an unsteady gait towards the right along the vertical axis after surgery,while the animals performed LE rolled towards the operated side.On the 3rd postoperative day,faint nystagmus appeared on the operated side,but the left and right nystagmus was significantly asymmetrical.The left and right nystagmus still remained asymmetrical on the 5th and 10th day postoperatively.From the 15th postoperative day,left and right nystagmus returned symmetrical in the animals performed TCO,while left and right nystagmus returned symmetrical only at the pendular amplitude of 120°,150°,180°,in the animals performed LE up to 30th postoperative day.There was a significant reduction of nystagmus to the operated side at the Pendular amplitude of 60°and 90° one month after the LE and there was 3 animals still displayed head tilt towards the operated side.Conclusion: the animals compensated faster and more completely after TCO than LE.