[Effect of cardiac resynchronization therapy on cardiac function post A-V and V-V optimization].

Area of Science:

• Cardiology
• Biomedical Engineering

Background:

• Refractory heart failure poses significant clinical challenges.
• Cardiac resynchronization therapy (CRT) is a treatment option for select heart failure patients.
• Optimizing device timing parameters may improve CRT efficacy.

Purpose of the Study:

• To evaluate the impact of atrioventricular (A-V) and ventriculo-arterial (V-V) delay optimization on cardiac function.
• To assess the effect of these optimizations on clinical improvement in patients with refractory heart failure undergoing CRT.

Main Methods:

• Thirty-two patients with chronic heart failure received CRT.
• Cardiac function was assessed at 7 days, 3 months, and 6 months post-CRT.
• Measurements were taken before and after A-V and V-V delay optimizations.

Main Results:

• CRT significantly improved synchronization and cardiac function markers (Ts-SD, LVEF, VTI, E/Em) compared to pre-CRT.
• A-V and V-V delay optimization at 7 days post-CRT improved ventricular synchronization but not immediate cardiac function.
• Significant improvements in LVEF and diastolic filling time were observed 6 months post-CRT following delay optimization.

Conclusions:

• Early A-V and V-V delay optimization after CRT enhances ventricular synchronization.
• This optimization is associated with sustained improvements in cardiac function at 6 months post-CRT.