Reverse remodelling induces progressive ventricular resynchronization after cardiac resynchronization therapy 'from...

Area of Science:

• Cardiology
• Heart Failure Management
• Cardiac Electrophysiology

Background:

• Cardiac dyssynchrony contributes to heart failure progression.
• Cardiac resynchronization therapy (CRT) aims to correct dyssynchrony and improve left ventricular (LV) function.
• Understanding the temporal relationship between dyssynchrony reduction and reverse remodeling is crucial for optimizing CRT outcomes.

Purpose of the Study:

• To evaluate the time course of left ventricular (LV) dyssynchrony improvement after cardiac resynchronization therapy (CRT).
• To assess the relationship between reduced LV dyssynchrony and reverse remodeling.
• To determine the impact of CRT on LV volumes, ejection fraction (EF), and long-term cardiovascular events.

Main Methods:

• Prospective evaluation of 64 patients undergoing CRT.
• Measurement of LV volumes, sphericity index, and ejection fraction (EF) at baseline, immediately post-CRT, and at 3 and 6 months.
• Assessment of LV dyssynchrony using speckle-tracking radial strain.

Main Results:

• Patients responding to CRT showed significant progressive decreases in LV volumes and increases in EF and sphericity index over 6 months.
• Dyssynchrony diminished progressively in responders during the first 3 months post-CRT.
• Responders experienced fewer major cardiovascular events compared to non-responders over a 24-month follow-up.

Conclusions:

• Cardiac resynchronization therapy (CRT) effectively reduces left ventricular (LV) dyssynchrony and promotes reverse remodeling.
• The improvements in dyssynchrony and reverse remodeling are progressive and sustained over 6 months post-CRT.
• CRT can transform a detrimental cycle of remodeling and dyssynchrony into a beneficial cycle of reverse remodeling and resynchronization, leading to improved clinical outcomes.