Key result
After coronary artery bypass graft surgery, ACE inhibitors significantly reduced end-diastolic volume index, whereas β-blockers significantly reduced end-systolic volume index compared to controls.
Why the study?
Do angiotensin converting enzyme inhibitors or beta-blockers improve left ventricular remodeling in patients after coronary artery bypass graft surgery?
Observational (n=59)
No
Do angiotensin converting enzyme inhibitors or beta-blockers improve left ventricular remodeling in patients after coronary artery bypass graft surgery?
ACE inhibitors and beta-blockers both protect against left ventricular remodeling after CABG, but through different mechanisms (ACEIs primarily reduce EDVI, while beta-blockers reduce ESVI and improve EF).
May support differential post-CABG remodeling effects; hypothesis-generating and leaves open randomized confirmation before practice change.
Preventing left ventricular (LV) remodeling after coronary artery bypass graft surgery (CABG) is important to avoid long-term congestive heart failure. The present study evaluated the effects of angiotensin converting enzyme inhibitors (ACEIs) and beta-blockers on LV remodeling. Twenty-three patients with angina pectoris and 36 with old myocardial infarction underwent CABG. We assessed end diastolic volume index (EDVI), end systolic volume index (ESVI), and ejection fraction (EF) using left ventriculography before and after CABG. Changes in EDVI, ESVI, and EF were studied in the ACEI, beta-blocker, and control groups. Although EDVI was reduced in the ACEI group, ESVI and EF improved only slightly, whereas in the group given beta-blockers, ESVI was reduced, EF improved, and EDVI was minimally reduced. These results indicate that ACEIs and beta-blockers both protect against LV remodeling, although through different mechanisms.
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Maruyama et al. (2008) conducted an observational in Left ventricular remodeling after coronary artery bypass graft surgery (n=59). Angiotensin converting enzyme inhibitors (ACEIs) and β-blockers vs. Control (no ACEI or β-blocker) was evaluated on Percentage change in end-diastolic volume index (% ∆ EDVI) for ACEI vs Control (p=<0.05). After coronary artery bypass graft surgery, ACE inhibitors significantly reduced end-diastolic volume index, whereas β-blockers significantly reduced end-systolic volume index compared to controls.
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