Evolving Indications, Challenges and Advances in Cardiac Resynchronization Therapy for Heart Failure

Area of Science:

• Cardiology
• Medical Devices

Background:

• Cardiac resynchronization therapy (CRT) using biventricular pacing has improved heart failure outcomes for two decades.
• However, a significant portion of patients do not respond to CRT, highlighting limitations in patient selection and therapy optimization.

Purpose of the Study:

• To review the challenges and advancements in CRT, including patient selection, programming, and efficacy assessment.
• To explore alternative pacing strategies, specifically conduction system pacing, as a potentially more physiological approach.

Main Methods:

• Review of existing literature on CRT efficacy, patient selection criteria, and procedural challenges.
• Analysis of emerging techniques in electrocardiography and imaging for improved patient stratification.
• Evaluation of preliminary data on conduction system pacing compared to traditional biventricular pacing.

Main Results:

• Suboptimal patient selection, characterizing conduction disease, procedural issues, and programming limitations hinder CRT success.
• Existing guidelines lack consensus on CRT efficacy evaluation, contributing to underuse in certain demographics.
• Conduction system pacing demonstrates comparable or superior efficacy in early studies, suggesting a more physiological alternative.

Conclusions:

• Despite CRT's benefits, non-response remains a challenge, necessitating improved patient selection and therapeutic strategies.
• Conduction system pacing represents a promising advancement, potentially offering a more effective and physiological approach to CRT.
• Further research is crucial to validate conduction system pacing and refine CRT protocols for broader patient benefit.