Coronary artery revascularization without cardiopulmonary bypass

Area of Science:

• Cardiovascular Surgery
• Interventional Cardiology
• Cardiac Surgery Outcomes

Background:

• Historically, cardiopulmonary bypass has been standard for coronary artery bypass grafting.
• Advancements in surgical techniques and patient selection have enabled off-pump procedures.
• The advent of percutaneous transluminal coronary angioplasty (PTCA) has created a need for alternative surgical strategies.

Purpose of the Study:

• To evaluate the safety and efficacy of single bypass procedures performed without a pump oxygenator.
• To analyze outcomes in patients undergoing off-pump bypass for native coronary artery disease and failed PTCA.

Main Methods:

• Retrospective review of 191 single bypass procedures performed without a pump oxygenator between 1969 and 1983.
• Division of patients into Group I (primary single bypass) and Group II (post-failed PTCA).
• Analysis of postoperative infarction rates, mortality, and long-term follow-up.

Main Results:

• Group I: 3.5% infarction rate for single bypass to the right coronary artery; 18.7% for left anterior descending (LAD) bypass (no longer performed off-pump).
• Redo group (previous bypass): 6.6% infarction rate.
• Group II (post-failed PTCA): No perioperative infarctions and one death in 31 patients undergoing single right bypass.

Conclusions:

• Single bypass surgery without a pump oxygenator is safe and effective when limited to right coronary artery lesions with adequate distal vessels.
• This technique is particularly useful in patients with failed percutaneous transluminal coronary angioplasty.
• Careful patient selection and expeditious surgical technique are crucial for successful off-pump single bypass grafting.