Influence of baseline left ventricular function on the clinical outcome of surgical ventricular reconstruction in...

Area of Science:

• Cardiology
• Cardiac Surgery
• Heart Failure Research

Background:

• The Surgical Treatment for Ischemic Heart Failure (STICH) trial found no overall survival benefit for adding surgical ventricular reconstruction (SVR) to coronary artery bypass grafting (CABG).
• Ischemic cardiomyopathy patients often have impaired left ventricular (LV) function, necessitating further investigation into potential benefits of SVR in specific subgroups.

Purpose of the Study:

• To investigate whether baseline left ventricular (LV) function parameters can identify subgroups of patients with ischemic cardiomyopathy who may benefit from SVR when added to CABG.
• To analyze the impact of LV end-systolic volume index (ESVI) and ejection fraction (EF) on outcomes in the STICH trial.

Main Methods:

• Analysis of 710 patients from the STICH trial with adequate baseline LV function data from echocardiography, cardiovascular magnetic resonance, or radionuclide imaging.
• Assessment of the relationship between LV function parameters (ESVI, EF, regional wall motion abnormalities) and patient outcomes using various imaging modalities and algorithms.

Main Results:

• Patients with smaller LVESVI (<60 mL/m2) and better LVEF (≥33%) showed potential benefit from SVR, as indicated by echocardiographic measures.
• Patients with larger LVESVI (>90 mL/m2) and poorer LVEF (≤25%) appeared to have worse outcomes with SVR.
• The extent of regional wall motion abnormalities did not influence the effects of SVR; algorithms using multiple imaging modalities showed weaker correlations between global LV function and SVR outcomes.

Conclusions:

• Subgroup analyses of the STICH trial suggest that SVR may benefit patients with less dilated left ventricles and better ejection fraction.
• Conversely, patients with larger left ventricles and poorer ejection fraction may experience adverse effects from SVR.
• These findings highlight the importance of individualized treatment strategies based on specific LV function parameters in ischemic cardiomyopathy.