[Echocardiographic evaluation to select patients for cardiac resynchronization therapy]

Area of Science:

• Cardiology
• Biomedical Engineering

Background:

• Heart failure with wide QRS complexes and asynchronous myocardial contraction indicates a poor prognosis.
• Biventricular pacing (BVP) can improve hemodynamics, clinical status, reverse remodeling, and survival in heart failure patients.
• A significant number of patients with wide QRS complexes do not improve with BVP, and some patients with normal QRS duration may also benefit from resynchronization therapy.

Purpose of the Study:

• To evaluate the effectiveness of tissue Doppler echocardiography in predicting BVP response.
• To explore the potential benefits of BVP in heart failure patients with normal QRS duration.
• To improve patient selection and optimize BVP therapy using echocardiographic and electrocardiographic criteria.

Main Methods:

• Assessing myocardial asynchrony using tissue Doppler echocardiography.
• Analyzing the correlation between QRS width and echocardiographically determined myocardial asynchrony.
• Reviewing retrospective and prospective studies on BVP patient selection based on asynchrony criteria.

Main Results:

• QRS width is a limited predictor of BVP benefit and weakly correlates with echocardiographic asynchrony.
• Tissue Doppler echocardiography appears to be the most accurate predictor of improvement after BVP.
• A consensus on the optimal method for assessing asynchrony is still lacking.

Conclusions:

• Tissue Doppler echocardiography can aid in prospectively selecting patients for BVP.
• Echocardiographic tools can guide BVP implantation and optimize device programming.
• Further research is needed to establish standardized methods for assessing asynchrony and selecting patients for BVP.