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  • Title: Angiotensin-converting enzyme inhibitor helps prevent late remodeling after left ventricular aneurysm repair in rats.
    Author: Nomoto T, Nishina T, Miwa S, Tsuneyoshi H, Maruyama I, Nishimura K, Komeda M.
    Journal: Circulation; 2002 Sep 24; 106(12 Suppl 1):I115-9. PubMed ID: 12354719.
    Abstract:
    BACKGROUND: We reported in a previous study that the initial effects of left ventricular (LV) repair (LVR) for LV aneurysm were not long lasting. Angiotensin-converting enzyme inhibitor (ACE-I) is known to attenuate remodeling after myocardial infarction, and could be effective after LVR. METHODS AND RESULTS: Left ventricular aneurysms were developed in rats after left anterior descending artery ligation. Rats were divided into 3 groups: sham operation with ACE-I (lisinopril 10 mg/kg/d) (n=10; group A), LVR (by plicating the LV aneurysm) with placebo (n=8; group R), and LVR with ACE-I (n=10; group RA). LV function was evaluated by echocardiography and catheterization. Oxidative stress in the myocardium was estimated by immunohistochemistry for 8-hydroxy-2'-deoxyguanosine. One week after LVR, LV end-diastolic area was smaller and fractional area change was better in the 2 LVR groups. Four weeks after LVR, LV end-diastolic area, and fractional area change deteriorated in group R but not so much in group RA; E-max was higher in group RA (0.79+/-0.20 mm Hg/mL) than in groups A (0.25+/-0.03 mm Hg/mL; P<0.01) and group R (0.27+/-0.03 mm Hg/mL; P<0.01). Oxidative stress was much lower in the 2 ACE-I groups. CONCLUSIONS: LVR improved LV size and systolic function only in the early phase. Adjuvant use of ACE-I was useful for preventing redilation and maintaining LV systolic function, was associated with suppressed oxidative stress, and may make LVR a more effective surgical procedure for LV aneurysm.
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