Revascularization in heart failure in the post-STICH era

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Heart Failure Research

Background:

• Ischemic cardiomyopathy, resulting from coronary artery disease, causes left ventricular dysfunction through myocyte death, stunning, and hibernation.
• Myocardial viability testing is employed to assess the potential for contractile function recovery post-revascularization in these patients.

Purpose of the Study:

• To evaluate the role of myocardial viability testing in predicting outcomes after revascularization in patients with ischemic cardiomyopathy.
• To address the controversy surrounding viability testing's clinical utility, particularly in light of the STICH trial substudy findings.

Main Methods:

• Review of observational studies and the STICH trial viability substudy.
• Discussion of limitations in previous study designs and implementation.
• Highlighting the need for randomized controlled trials with advanced imaging modalities.

Main Results:

• Observational studies suggested value in viability testing.
• The STICH viability substudy indicated that viability testing did not predict differential outcomes based on treatment, with a trend towards better survival in non-viable myocardium post-revascularization.

Conclusions:

• The clinical utility of myocardial viability testing in guiding revascularization for ischemic cardiomyopathy remains debated due to conflicting evidence and study limitations.
• High-resolution imaging techniques like positron emission tomography and cardiac MRI are crucial for future randomized trials to clarify the benefits of revascularization based on myocardial viability.