The Past, Present and Future of Cardiac Resynchronization Therapy

Area of Science:

• Cardiology
• Medical Devices
• Heart Failure Management

Background:

• Cardiac resynchronization therapy (CRT) is a cornerstone in managing heart failure with reduced ejection fraction (HFrEF) and electrical dyssynchrony.
• Current guidelines recommend CRT based on left ventricular systolic function, QRS duration/morphology, and functional class.
• Despite proven benefits, CRT utilization is suboptimal, and over one-third of patients do not respond adequately.

Purpose of the Study:

• To review the current landscape of CRT patient selection, underutilization, and non-response.
• To highlight the multifactorial nature of CRT non-response.
• To discuss strategies for improving CRT efficacy through multidisciplinary approaches and technological innovation.

Main Methods:

• Review of current guidelines and evidence for CRT patient selection.
• Analysis of factors contributing to CRT non-response.
• Discussion of emerging technologies and personalized approaches for CRT.

Main Results:

• CRT selection criteria include LVEF, QRS duration, and NYHA class.
• Significant rates of CRT non-response (over 33%) exist, defined by lack of reverse remodeling or clinical improvement.
• Causes of non-response are multifactorial, requiring a comprehensive approach.

Conclusions:

• Optimizing CRT requires addressing patient selection, procedural techniques, and post-implant care.
• Multidisciplinary collaboration is crucial for overcoming CRT non-response.
• Future personalized CRT systems leveraging novel pacing and advanced imaging hold promise for tailored patient care.