中文摘要：

目的探讨烟酰胺腺嘌呤二核苷酸磷酸氧化酶抑制剂夹竹桃麻素对兔心房急性电重构的预防作用。方法选择新西兰白兔18只，随机分为对照纽、心房快速起搏组和夹竹桃麻素＋心房快速起搏组（夹竹桃麻素组），每组6只。对照组和心房快速起搏组术前生理盐水3ml／（kg·d）灌胃3d，夹竹桃麻素组予30mg／（kg·d）药物灌胃3d。对照组术中不行心房快速起搏，心房快速起搏组与夹竹桃麻素组术中以最快的能维持心房1：1起搏的频率（500～600／min）给予快速刺激。分别在0、0．5、1．0、1．5、2．0、2．5和3．0h时，测量基础刺激周长分别为200ms和150ms的右心房有效不应期（atrial effective refractory period，AERP），分析AERP频率适应性的变化，并记录心房颤动（房颤）的诱发情况。结果对照组和夹竹桃麻素组AERP200和AERP150无明显变化，心房快速起搏组AERP200和AERP150与心房快速起搏时间呈负相关（r=-0．650，P〈0．01；r=-0．498，P〈0．01）；对照组和夹竹桃麻素组AERP频率适应性指标无明显变化，心房快速起搏组AERP频率适应性与心房快速起搏时间呈负相关（r=-0．341，P〈0．05）；心房快速起搏组和夹竹桃麻素组的房颤诱发率分别为66．67％和16．67％，平均房颤持续时间分别为37．75min和0．67min，差异有统计学意义（P〈0．05）。结论夹竹桃麻素能够减缓心房电重构的发生、发展，降低房颤的持续时间。

英文摘要：

Objective To investigate the effect of apocynin, a NADPH oxidase inhibitor,on atrial electrical remodeling in rabbits. Methods Eighteen rabbits were randomly assigned to three groups： control group, rapid atrial pacing （RAP） group and apocynin plus rapid atrial pacing （APO ＋RAP） group. Normal saline was given intragastricaly in control and RAP group for 3 days before electrophysiology study. Apocynin 30 mg/（kg · d） was given in group APO＋RAP instead. In both RAP and APO＋RAP groups,right atrium was paced at 500 to 600 beats/ min for 3 hours. Right atrial effective refractory period（AERP） was measured at the basic cycle length of 200 ms and 150 ms every 0.5 hour,the changes of rate adaptation of AERP and the inducibility of atrial fibrillation were analyzed. Results AERP200 and AERP150 did not change obviously in control and APO ＋ RAP groups, they correlated negatively with the duration of RAP in RAP group （r =- 0. 650, P 〈 0.01 ; r =- 0. 498, P 〈 0.01, respectively）. Rate adaptation of AERP showed no significant change in control and APO＋RAP groups, whereas there was a negative correlation between rate adaptation of AERP and duration of RAP in RAP group （r =- 0. a41, P 〈 0.05）. In RAP group and APO＋RAP group,the inducibility of AF was 66.67 % and 16.67 %,respectively. The average duration of induced AF was 37.75 min and 0. 67 min respectively （P 〈 0.05）. Conclusion Apoeynin attenuates the development of atrial electrical remodeling and reduce the duration of atrial fibrillation in this model.