Non-invasive electromechanical activation imaging as a tool to study left ventricular dyssynchronous patients: Implication for CRT therapy

- Reconstructed regional electrical and mechanical activation correctly captured LBBB propagating.
- 5 responders out of 10 showed significant mechanical and electrical delay on basal lateral LV compared to non-responders.
- 3 non-responders out of 10 showed a global trend of electromechanical uncoupling at baseline.
- ECGI showed preserved electrical activation patterns and reduced QRS duration in native rhythm on follow-up.

AimsElectromechanical de-coupling is hypothesized to explain non-response of dyssynchrony patient to cardiac resynchronization therapy (CRT). In this pilot study, we investigated regional electromechanical uncoupling in 10 patients referred for CRT using two non-invasive electrical and mechanical imaging techniques (CMR tissue tracking and ECGI).Methods and resultsReconstructed regional electrical and mechanical activation captured delayed LBBB propagation direction from septal to anterior/inferior and finally to lateral walls as well as from LV apical to basal. All 5 responders demonstrated significantly delayed mechanical and electrical activation on the lateral LV wall at baseline compared to the non-responders (P < .05). On follow-up ECGI, baseline electrical activation patterns were preserved in native rhythm and global LV activation time was reduced with biventricular pacing.ConclusionsThe combination of novel imaging techniques of ECGI and CMR tissue tracking can be used to assess spatial concordance of LV electrical and mechanical activation to gain insight into electromechanical coupling.

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