Coronary artery bypass grafting in patients with profound ventricular dysfunction

Area of Science:

• Cardiovascular Surgery
• Cardiac Surgery Outcomes
• Ventricular Dysfunction Management

Background:

• Patients with severe ventricular dysfunction undergoing coronary artery bypass grafting (CABG) face high risks but also significant survival benefits.
• This subset requires careful consideration of surgical strategies and support devices.

Purpose of the Study:

• To evaluate the outcomes of CABG in patients with severely reduced left ventricular ejection fractions (LVEF).
• To compare the impact of different graft types and the utility of intraaortic balloon pumps (IABP) in this high-risk population.

Main Methods:

• A retrospective study of 61 consecutive CABG patients with preoperative LVEF ≤ 25%.
• Patients were stratified into three groups based on LVEF: 21-25% (Group I), 16-20.9% (Group II), and 10-15.9% (Group III).
• Outcomes, including mortality, graft usage (left internal mammary artery vs. saphenous vein), and IABP use, were analyzed.

Main Results:

• Overall mortality was 8% (5/61), with no deaths in the lowest LVEF group (Group III).
• Left internal mammary artery conduits were associated with higher mortality, though not statistically significant compared to saphenous vein grafts.
• Intraaortic balloon pump use was significantly higher in patients with poorer ventricular function (P < 0.05), often placed intraoperatively.

Conclusions:

• Coronary artery bypass grafting is a viable option for patients with poor ventricular function, offering acceptable mortality rates.
• Left internal mammary artery grafting did not demonstrate a perioperative survival benefit and may carry early risks.
• Prophylactic intraaortic balloon pump use should be considered for patients with LVEF < 20%.