Analysis of LV lead position in cardiac resynchronization therapy using different imaging modalities

Area of Science:

• Cardiology
• Medical Imaging
• Biomedical Engineering

Background:

• Left ventricular (LV) lead position is critical for cardiac resynchronization therapy (CRT) effectiveness.
• Current methods for determining optimal LV lead placement are not well-defined.
• Accurate LV lead positioning impacts CRT patient outcomes.

Purpose of the Study:

• To assess if myocardial deformation imaging during LV pacing can determine LV lead position in CRT.
• To compare different imaging techniques for LV lead position analysis.
• To correlate LV lead position with CRT effectiveness.

Main Methods:

• Evaluated 56 patients undergoing CRT using fluoroscopy and two myocardial deformation imaging techniques.
• Assessed LV lead position by identifying peak circumferential strain differences during LV pacing and biventricular CRT.
• Defined optimal LV lead position based on concordance with the segment exhibiting the latest systolic strain prior to CRT.

Main Results:

• LV lead position determined by LV pacing correlated well with fluoroscopic findings (kappa = 0.761).
• Patients with optimal LV lead position showed significantly greater improvement in LV ejection fraction and reduction in end-diastolic volume.
• Myocardial deformation imaging during LV pacing demonstrated superior discriminatory power for predicting ejection fraction improvement compared to biventricular pacing or fluoroscopy.

Conclusions:

• Myocardial deformation imaging during LV pacing is a viable method for determining LV lead position in CRT.
• LV lead position analysis during LV pacing best predicts improvements in LV function and remodeling.
• This imaging approach offers enhanced prediction of CRT success.