Extensive left ventricular remodeling does not allow viable myocardium to improve in left ventricular ejection...

Area of Science:

• Cardiology
• Cardiovascular Surgery
• Medical Imaging

Background:

• Ischemic cardiomyopathy often involves left ventricular (LV) remodeling.
• Revascularization aims to improve cardiac function, but extensive remodeling can impede recovery.
• Myocardial viability assessment is crucial for predicting outcomes after revascularization.

Purpose of the Study:

• To investigate the impact of left ventricular remodeling on functional recovery after surgical revascularization in patients with ischemic cardiomyopathy.
• To determine if myocardial viability and LV size predict improvement in left ventricle ejection fraction (LVEF) and long-term prognosis.

Main Methods:

• Seventy-nine patients with ischemic cardiomyopathy underwent surgical revascularization.
• Myocardial viability was assessed using F18-fluorodeoxyglucose and SPECT.
• LV volumes and LVEF were evaluated by echocardiography before and 8-12 months after revascularization.
• Three-year clinical follow-up for adverse events was obtained.

Main Results:

• Left ventricular end-systolic volume was significantly larger in patients who did not improve LVEF post-revascularization.
• Baseline LV end-systolic volume was inversely correlated with LVEF improvement.
• Patients with viable myocardium and smaller LV size had the lowest adverse event rates (5%).
• Patients with non-viable myocardium and large LV size had the highest event rates (67%).

Conclusions:

• Extensive left ventricular remodeling, indicated by larger LV end-systolic volume, significantly hinders LVEF improvement after revascularization.
• LV remodeling negatively affects long-term prognosis in ischemic cardiomyopathy patients, irrespective of myocardial viability.
• Pre-operative assessment of LV size and myocardial viability is essential for predicting outcomes after revascularization.