[Coronary artery bypass grafting for cases which were not amenable to preoperative left ventriculogram]

Area of Science:

• Cardiology
• Cardiac Surgery
• Diagnostic Imaging

Background:

• Preoperative left ventriculograms (LVG) are standard for assessing cardiac function before coronary artery bypass grafting (CABG).
• Certain patient conditions preclude standard preoperative LVG, necessitating evaluation of outcomes in these high-risk cases.

Purpose of the Study:

• To evaluate the outcomes of isolated CABG in patients who could not undergo preoperative LVG.
• To identify risk factors associated with poor outcomes in this specific patient cohort.

Main Methods:

• Retrospective analysis of 2045 isolated CABG cases between June 1970 and March 1996.
• Focused analysis on 52 cases where preoperative LVG was not feasible due to critical conditions like cardiopulmonary resuscitation (CPR), shock, or severe heart failure (NYHA class IV/CCS class IV).
• Detailed review of preoperative diagnoses, comorbidities (chronic renal failure, arrhythmia), coronary lesion complexity (left main trunk, triple vessel disease), and intra-aortic balloon pumping (IABP) use.

Main Results:

• The 52 cases not amenable to preoperative LVG represented a high-risk group with significant comorbidities and complex coronary artery disease.
• Surgical and hospital mortality rates were 9.6% and 7.7%, respectively.
• Outcomes in patients without preoperative LVG were worse compared to those with ischemic cardiomyopathies, with all deaths in patients requiring preoperative CPR attributed to brain injury.

Conclusions:

• The inability to perform a preoperative LVG is a significant indicator of increased risk in CABG patients.
• These findings underscore the importance of preoperative assessment and risk stratification, particularly in critically ill patients undergoing CABG.