Usefulness of Cardiac Resynchronization Therapy Optimization Using Combined Electrocardiography and Echocardiography

Area of Science:

• Cardiology
• Medical Imaging
• Electrophysiology

Background:

• Cardiac resynchronization therapy (CRT) optimization is crucial for improving left ventricular (LV) function.
• Electrocardiogram (ECG)-based optimization alone may not be sufficient for all patients.

Purpose of the Study:

• To investigate if transthoracic echocardiography (TTE) can further enhance CRT efficacy beyond ECG-based optimization.
• To assess the impact of TTE-guided adjustments on LV function and synchrony.

Main Methods:

• A study included 65 patients who underwent CRT implantation.
• Data were collected before optimization (A), after ECG optimization (B), and after TTE adjustments (C).
• Key parameters analyzed included PR interval, QRS width, LV ejection fraction, and septal flash.

Main Results:

• TTE adjustments significantly improved LV ejection fraction (28.1% to 31.5%) and reduced septal flash (46.2% to 15.4%).
• 29 patients required TTE adjustments for further LV dyssynchrony improvement after initial ECG optimization.
• Patients needing TTE optimization showed higher QRS width post-ECG optimization.

Conclusions:

• TTE-based optimization is valuable for enhancing LV function and synchrony in CRT patients when ECG optimization is insufficient.
• TTE evaluation is important for comprehensive CRT optimization.
• This approach can lead to better patient outcomes in CRT therapy.