Results of coronary artery surgery in patients with poor left ventricular function (CASS)

Area of Science:

• Cardiology
• Cardiac Surgery
• Heart Failure Management

Background:

• Severe left ventricular dysfunction (ejection fraction < 0.36) presents a significant challenge in cardiac care.
• Patients with poor ejection fraction often have complex coronary artery disease and comorbidities.

Purpose of the Study:

• To evaluate the survival and symptomatic benefits of surgical treatment versus medical management in patients with severe left ventricular dysfunction.
• To identify patient subgroups that benefit most from surgical intervention.

Main Methods:

• Retrospective analysis of 651 patients (420 medical, 231 surgical) with severe left ventricular dysfunction.
• Comparison of baseline characteristics, including angina, heart failure symptoms, coronary artery disease severity, and left main stenosis.
• Multivariate regression analysis to assess survival and prognostic factors.

Main Results:

• Surgical patients had more severe angina, coronary disease, and left main lesions but less predominant heart failure symptoms.
• Multivariate analysis indicated surgical treatment prolonged survival, though less than factors like heart failure severity and age.
• Patients with ejection fractions < 0.26 showed a 5-year survival of 63% with surgery versus 43% with medical treatment.
• Surgical intervention provided symptomatic relief for angina but not for heart failure symptoms.

Conclusions:

• Patients with predominantly ischemic pain symptoms and severe left ventricular dysfunction benefit from surgical treatment.
• The benefits of surgery are most pronounced in patients with ejection fractions below 0.26.
• Operative mortality must be carefully considered and ideally matched or improved upon the study's 6.9% rate.