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Surgical Swine Model of Chronic Cardiac Ischemia Treated by Off-Pump Coronary Artery Bypass Graft Surgery
Published on: March 27, 2018
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Coronary bypass in left ventricular dysfunction and differential cardiac recovery
Lucian Lozonschi1, Takushi Kohmoto1, Satoru Osaki1
11 Section of Cardiac Surgery, Division of Cardiothoracic Surgery, Department of Surgery, 5232 University of Wisconsin School of Medicine and Public Health , Madison, WI, USA.
Asian Cardiovascular & Thoracic Annals
|November 21, 2017
Summary
Surgical revascularization improves left ventricular function in patients with ischemic cardiomyopathy. However, right ventricular function may decline, potentially impacting long-term outcomes and heart failure symptoms.
Area of Science:
- Cardiology
- Cardiac Surgery
- Heart Failure Research
Background:
- Ischemic cardiomyopathy with poor left ventricular function presents a significant clinical challenge.
- Surgical revascularization is a potential therapeutic strategy for these patients.
Purpose of the Study:
- To evaluate the efficacy of surgical revascularization on ventricular function and survival.
- To compare different surgical techniques for coronary artery bypass grafting.
Main Methods:
- Retrospective analysis of 429 patients with ejection fraction <40% undergoing coronary artery bypass grafting (CABG) between 2000 and 2016.
- Surgical techniques included on-pump cardioplegic arrest, off-pump, and on-pump beating heart procedures.
- Propensity matching was used to compare outcomes between cardioplegic arrest and combined off-pump/beating heart groups.
Main Results:
- Coronary artery bypass grafting significantly improved left ventricular ejection fraction (LVEF) postoperatively (10.1% increase).
- Mitral regurgitation grade also improved, but right ventricular function showed a decline over time.
- No significant differences in LVEF improvement were observed across different time intervals post-surgery.
- Propensity-matched analysis revealed no significant difference in survival or postoperative complications between surgical techniques.
Conclusions:
- Coronary artery bypass grafting leads to sustained improvement in LVEF for patients with moderate to severe left ventricular dysfunction.
- Deterioration of right ventricular function can persist, contributing to heart failure symptoms and late mortality.
- Surgical technique (cardioplegic arrest vs. off-pump/beating heart) did not impact survival rates.
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