Omentopexy Decreasing the Susceptibility of Ventricular Arrhythmia in Experimental Rats With Chronic Myocardial Infarction
10.3969/j.issn.1000-3614.2014.11.018
- VernacularTitle:慢性心肌梗死大鼠室性心律失常的实验研究﹡
- Author:
Jianfeng HOU
;
Changwei ZHANG
;
Zhe ZHENG
;
Shengshou HU
- Publication Type:Journal Article
- Keywords:
Omentopexy;
Myocardial infarction;
Arrhythmia;
Nerve remodeling
- From:
Chinese Circulation Journal
2014;(11):924-927
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To conifrm the omentopexy decreasing the susceptibility of ventricular arrhythmia in experimental rats with chronic myocardial infarction (MI) by nerve remodeling.
Methods: The MI model of SD rats was established by left coronary artery ligation. 3 weeks later, the qualiifed animals were randomized into 3 groups for the 2nd operation. ① Sham operation group, the rats received the 2nd operation without ligation, ② Isolated MI group, the rats received the 2nd operation without omentopexy, ③ Omentopexy group, the rats received the 2nd operation with omentopexy. n=20 in each group. 4 weeks after the 2nd operation, the electrophysiological characteristics were assessed by relevant techniques, the new and sympathetic nerves in MI border zone were examined by immunohistochemistry, the protein expressions of connexin43 and nerve growth factor (NGF) were measured by western blot analysis and the cardiac endothelin-1 (ET-1) level was evaluated by ELISA.
Results: Compared with Isolated MI group, Omentopexy group showed decreased susceptibility of arrhythmia (3.5 ± 1.2) vs (0.9 ± 0.2), improved electrical transduction (1.5 ± 0.2) mV vs (3.4 ± 0.3) mV and decreased capture threshold (5.5 ± 0.3) mV vs (2.2 ± 0.2) mV, all P<0.05. Compared with Isolated MI group, immunihistochemisty indicated that Omentopexy group had decreased new and sympathetic nerves in MI border zone, as for GAP43:(1388.4 ± 244.9)μm2/mm2 vs (768.6 ± 144.1)μm2/mm2, for TH:(1552.4 ± 270.3)μm2/mm2 vs (1018.5 ± 124.7)μm2/mm2, all P<0.05. Western blot analysis showed that Omentopexy group had the lower NGF expression and higher connexin43 expression;ELISA demonstrated that Omentopexy group had the lower ET-1 expression, P<0.05.
Conclusion: Omentopexy may decrease the susceptibility of ventricular arrhythmia after MI in experimental rats, which might be related to the cardiac nerve remodeling.
