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Role of cardiopulmonary bypass in single vessel coronary revascularization: implications for MID-CABG
1Department of Surgery, Columbia University College of Physicians and Surgeons, New York, New York, USA.
Insights
Minimally invasive direct coronary artery bypass grafting (MID-CABG) can be performed without cardiopulmonary bypass (CPB) even in high-risk patients. This approach showed acceptable early outcomes comparable to lower-risk patients undergoing traditional CABG with CPB.
Area of Science:
- Cardiovascular Surgery
- Thoracic Surgery
- Minimally Invasive Procedures
Background:
- Minimally invasive direct coronary artery bypass grafting (MID-CABG) is an evolving treatment for coronary artery disease.
- Technical challenges exist, particularly regarding the use of cardiopulmonary bypass (CPB).
Purpose of the Study:
- To compare outcomes of MID-CABG performed with and without cardiopulmonary bypass (CPB).
- To evaluate the safety and efficacy of off-pump coronary artery bypass grafting in higher-risk patients.
Main Methods:
- Analysis of the 1995 New York State CABG registry.
- Comparison of single-vessel bypass patients without CPB (Non-CPB Group) versus those with CPB (CPB Group).
- Stratification of patient risk factors including age, reoperation, MI, heart failure, and vascular disease.
Main Results:
- The Non-CPB Group included significantly higher-risk patients.
- Higher incidence of ventricular arrhythmias and heart block in the Non-CPB Group.
- Similar postoperative complications, hospital mortality, and length of hospitalization between groups.
Conclusions:
- Off-pump MID-CABG is a viable option for higher-risk patients.
- Early morbidity and mortality outcomes are acceptable and comparable to on-pump procedures.
- Further long-term follow-up is needed to confirm the utility of off-pump MID-CABG.
Background:
Minimally invasive direct coronary artery bypass grafting (MID-CABG) is being utilized for the treatment of coronary artery disease in selected patients. This innovative procedure has generated numerous technical issues relating to coronary revascularization, including whether to perform the revascularization with or without cardiopulmonary bypass (CPB).
Methods:
We addressed this issue indirectly by analyzing the 1995 New York State CABG registry, comparing patients who had single vessel bypass without CPB (Non-CPB Group) to a similar cohort of patients who had CABG performed on CPB (CPB Group). The database showed stratification of patients selected for bypass grafting without CPB to a significantly higher risk group, as shown by increased age, higher incidence of reoperation, transmural MI, congestive heart failure, carotid/cerebrovascular disease, and peripheral vascular disease.
Results:
Patients in the Non-CPB Group had a higher incidence of postoperative malignant ventricular arrhythmias and heart block requiring pacemaker insertion. Otherwise, the incidence of postoperative complications was similar between the two groups.
Conclusions:
There were no statistical differences in the hospital mortality or the length of hospitalization between the two groups. In conclusion, the data showed a definite trend toward doing higher risk cases off CPB. These cases had an acceptable early morbidity and mortality outcome. The results were comparable to a group of lower risk patients with single vessel CABG done on cardiopulmonary bypass. However, further follow-up are required to evaluate long-term outcomes and confirm the utility of this surgical option.