摘要
目的建立急性心肌梗死(AMI)后新发心房颤动犬模型,并探讨新发心房颤动与交感神经重构的关系。
方法采用随机数字表法将成年比格犬分为4组,A组结扎左回旋支(n=6),B组结扎左回旋支、右房前支和右房中间支(n=6),C组结扎前室间支(n=6),D组为假手术组(n=6)。测定心肌梗死前、梗死后30 min、2 h和4 h的心房颤动诱发率、心房颤动持续时间、有效不应期(ERP)、心肌酪氨酸羟化酶(TH)和去甲肾上腺素转运蛋白(NET)阳性神经纤维密度。
结果(1)右心房和左心耳Burst刺激后,B组的心房颤动诱发率最高分别为96.7%(58/60)和95.0%(57/60),A组最高分别为81.7%(49/60)和38.3%(23/60),C组最高分别为28.3%(17/60)和35.0%(21/60),D组最高分别为20.0%(12/60)和33.3%(20/60)。(2)梗死后4 h,B组左心耳心房颤动持续时间为(193.5±54.7) s,均长于A组的(53.8±9.4) s、C组的(45.0±19.5) s和对照组的(16.7±4.5) s(P均〈0.05)。(3)B组梗死后30 min的左心耳ERP为(173.8±8.0) ms,长于梗死前的(162.5±6.4) ms(P〈0.05);梗死后2和4 h的左心耳ERP分别为(145.0±6.1) ms和(137.2±6.3) ms,均较梗死前缩短(P均〈0.05)。(4)左心房和左心耳TH阳性神经纤维密度A组分别为(3 485±694)μm^2/mm^2和(2 645±454) μm^2/mm^2,B组分别为(7 873±1 159)μm^2/mm^2和(3 070±605) μm^2/mm^2,均分别高于C组的(1 474±475) μm^2/mm^2和(1 177±277) μm^2/mm^2及对照组的(678±206) μm^2/mm^2和(489±125) μm^2/mm^2(P均〈0.05),且B组右心房、右心耳的TH阳性神经纤维密度均高于A组(P均〈0.05);左心房和左心耳NET阳性神经纤维密度A组分别为(476±75) μm^2/mm^2和(414±52) μm^2/mm^2,B组分别为(527±81) μm^2/mm^2和(429±85) μm^2/mm^2,均分别低于C组的(1 044±105) μm^2/mm^2和(867±
ObjectiveTo establish the canine model of new-onset atrial fibrillation (AF) after acute myocardial infarction (AMI), and explore the relationship between new-onset AF and sympathetic neural remodeling in this model.
MethodsTwenty four adult mongrel dogs were randomly divided into 4 groups by applying random number table.Group A (n=6): ligate the left circumflex artery (LCX). Group B (n=6): ligate the LCX and right atrial anterior artery and right atrial middle artery.Group C (n=6): ligate left anterior descending artery.Group D(n=6): sham operation.Sequential electrophysiology study was performed in all dogs to determine the AF induction rate, AF duration, effective refractory period (ERP), the density of tyrosine hydroxylase (TH) and norepinephrine transporter(NET) before AMI or sham operation, and at 30 min, 2 hours and 4 hours after AMI or sham operation.
Results(1) The highest AF induction rate of right atrium and left auricle was 96.7%(58/60) and 95.0%(57/60) in group B, 81.7%(49/60)and 38.3%(23/60) in group A, 28.3%(17/60) and 35.0%(21/60) in group C, 20.0%(12/60) and 33.3%(20/60) in group D. (2) At 4 hours after AMI, AF duration was significantly prolonged in group B(193.50±54.67) s, compared with group A(53.83±9.37) s, group C(45.00±19.50) s, and group D(16.67±4.50) s (all P〈0.05). (3) In group B, the ERP of AF was prolonged at 30 minutes after AMI and shortened at 2 hours and 4 hours after AMI compared with baseline level(all P〈0.05). (4) The TH density of left atrium ((3 485±694) μm^2/mm^2) and left auricle((2 645±454) μm^2/mm^2) in group A and the TH density of left atrium ((7 873±1159) μm^2/mm^2) and left auricle((3 070±605) μm^2/mm^2) in group B were significantly higher than those in group C ((1 474±475)μm^2/mm^2, (1 177±277) μm^2/mm^2) and group D ((678±206) μm^2/mm^2, (489±125) μm^2/mm^2) (al
出处
《中华心血管病杂志》
CAS
CSCD
北大核心
2015年第11期975-981,共7页
Chinese Journal of Cardiology
基金
基金项目:新疆维吾尔自治区自然科学基金(2014211C068)
关键词
心房颤动
心肌梗死
肾上腺素能纤维
Atrial fibrillation
Myocardial infarction
Adrenergic fibers