Cardiac resynchronization therapy: dyssynchrony imaging from a heart failure perspective

Area of Science:

• Cardiology
• Medical Imaging
• Heart Failure Management

Background:

• Cardiac resynchronization therapy (CRT) is a treatment for heart failure.
• Patient selection for CRT is crucial for optimal outcomes.
• The role of imaging in guiding CRT patient selection is under investigation.

Purpose of the Study:

• To evaluate the evidence supporting and refuting the use of imaging for selecting patients for CRT.
• To determine if imaging can predict clinical response to CRT.

Main Methods:

• Review of existing evidence on imaging modalities for CRT patient selection.
• Analysis of studies correlating imaging parameters with CRT response.
• Comparison of imaging-based selection with clinical assessment.

Main Results:

• No evidence supports the use of QRS interval or imaging-measured dyssynchrony for predicting CRT response in dilated cardiomyopathy.
• Clinical evaluation is the most reliable method for selecting patients for CRT.
• Specific patient characteristics like low blood pressure and moderate mitral regurgitation may indicate greater benefit from CRT.
• The added benefit of a defibrillator with CRT is modest and uncertain.

Conclusions:

• Echocardiography may hinder rather than help appropriate CRT implementation.
• Cardiac dyssynchrony measured by echocardiography might not be the basis for CRT's therapeutic effects.