Right Ventricular and Left Atrial Strain Predict Volumetric Response to Cardiac Resynchronization Therapy.

Area of Science:

• Cardiology
• Medical Imaging
• Biomedical Engineering

Background:

• Echocardiography-derived strain and contraction patterns are variably linked to cardiac resynchronization therapy (CRT) volumetric response.
• The utility of cardiac magnetic resonance (CMR)-derived strain parameters in predicting CRT response remains unexplored.

Purpose of the Study:

• To investigate the association between CMR-derived strain parameters and the volumetric response to CRT.
• To determine if CMR-derived strain metrics can predict echocardiographic response to CRT.

Main Methods:

• Retrospective analysis of 50 patients undergoing CRT implantation.
• Assessment of CMR imaging (pre-CRT) and echocardiography (pre- and post-CRT).
• Echocardiographic response defined as ≥15% reduction in left ventricular end-systolic volume.

Main Results:

• Significant differences in indexed right ventricular volumes (RVEDVi, RVESVi) and left atrial area between CRT responders and non-responders.
• CRT responders exhibited significantly better left atrial global longitudinal strain (GLS) and global circumferential strain (GCS).
• Responders also showed improved right ventricular GLS and free wall strain compared to non-responders.

Conclusions:

• CMR-derived peak septal circumferential strain and RVEDVi are correlated with the echocardiographic volumetric response to CRT.
• CMR-derived strain parameters offer potential as predictors of CRT response.