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Effects of Two Inhibitors of Renin‐Angiotensin System on Attenuation of Postoperative Remodeling after Left Ventricular Aneurysm Repair in Rats
Author(s) -
Nomoto Takuya,
Nishina Takeshi,
Tsuneyoshi Hiroshi,
Miwa Senri,
Nishimura Kazunobu,
Komeda Masashi
Publication year - 2003
Publication title -
journal of cardiac surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 58
eISSN - 1540-8191
pISSN - 0886-0440
DOI - 10.1046/j.1540-8191.18.s2.9.x
Subject(s) - medicine , cardiology , ventricular remodeling , lisinopril , candesartan , aneurysm , blood pressure , renin–angiotensin system , myocardial infarction , angiotensin converting enzyme , surgery
We reported that the initial beneficial effects of left ventricular repair (LVR) surgery for LV aneurysm after myocardial infarction (MI) did not persist because of postoperative LV remodeling in a rat model. The renin‐angiotensin system (RAS) plays an important role in postinfarction LV remodeling. Inhibition of RAS may be useful to preserve LV function by preventing remodeling. We studied the effects of two inhibitors of RAS in an attempt to improve the operative results of LVR. LV aneurysms were created in rats after ligating the left anterior descending artery. These rats underwent LVR by plicating the LV aneurysm and were treated by three methods: no treatment, treatment with angiotensin‐converting enzyme inhibitor (ACE‐I) (lisinopril 10 mg/kg per day), and treatment with angiotensin II receptor blocker (ARB) (candesartan 5 mg/kg per day). One week after LVR, echocardiography revealed smaller LV size and better LV motion than before surgery. Four weeks after LVR, LV size returned to the preoperative value in the untreated group, but not as much in the treated groups. Cardiac catheterization revealed lower LV end‐diastolic pressure and higher E‐max in the treated groups. There was no difference between ACE‐I and ARB groups except for systolic blood pressure. LVR decreased LV size and improved systolic function only in the early phase. Adjuvant therapy of ACE‐I or ARB‐attenuated LV remodeling and maintained LV function at the same level after LVR. This probably indicates that tissue RAS is associated with postoperative remodeling. Concomitant use of RAS inhibitors may make LVR a longer‐lasting procedure for LV aneurysm. (J CARD SURG 2003;18 (Suppl 2):S61‐S68)