A real-time three-dimensional echocardiographic validation of an intracardiac electrogram-based method for optimizing...

Area of Science:

• Cardiology
• Biomedical Engineering

Background:

• Cardiac resynchronization therapy (CRT) optimization improves hemodynamics but is time-consuming.
• A novel method using intracardiac electrograms (IEGM) for CRT optimization has been developed.
• Real-time 3D echocardiography (RT3DE) can assess CRT's impact on left ventricular (LV) function.

Purpose of the Study:

• To evaluate the effectiveness of IEGM-based CRT optimization.
• To assess improvements in LV asynchrony and performance using RT3DE.

Main Methods:

• Prospective study of 20 patients with CRT.
• RT3DE performed before and after IEGM optimization.
• Assessed asynchrony using Tmsv 16-SD and Tmsv 12-SD; evaluated LV volumes, ejection fraction, stroke volume, MPI, and timing intervals.

Main Results:

• IEGM optimization significantly decreased Tmsv 12-SD and Tmsv 16-SD.
• Left ventricular ejection fraction and stroke volume improved significantly.
• Filling time/RR and ejection time/RR increased, and MPI improved post-optimization.

Conclusions:

• A simple IEGM-based method effectively optimizes CRT.
• This method reduces LV dyssynchrony.
• Systolic function is improved in CRT patients following IEGM-based optimization.