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Clinical Trial Summary


Cardiac Resynchronization Therapy (CRT) is proven to improve survival and heart function of patient with certain electrical conduction abnormality and heart failure. However, in patient with certain electrical conduction abnormality, a good response is observed in less than 40% in patient receiving CRT. Conventionally the surgical approach of CRT is to implant one pacing lead in the right heart and one in the left heart to resynchronize the contraction and the pacing lead in the left heart is usually placed in the posterior or lateral portion of the left heart. However, this single approach may not be optimal, especially for those patients with conduction abnormality known to have poor response to CRT.

Purpose of the clinical investigation

The purpose of the Electrical Activation Guided CRT Study is to study the effectiveness of a tailored made approach to CRT procedure by using a noninvasive globally mapping system studying the electrical conduction under different approaches to delivery CRT. The pacing approach that optimally corrects conduction abnormality will be determined before the actual implantation procedure.

Conduct of the Investigation

This study will include 93 patients with conduction abnormality that known to have a poor response to CRT from Prince of Wales Hospital, Hong Kong.Subjects will be followed up at 3 months and 6 months visit.

Clinical Trial Description

The purpose is to prospectively study the feasibility to optimize configuration of CRT delivery for acute correction of electrical dyssynchrony using a noninvasive mapping of global electrical activation.

Study Hypothesis: Tailor-made configuration of CRT delivery is feasible and able to improve responder rate compare to single method of CRT delivery in candidates with known poor response to CRT.

Primary outcome measure: Responder rate of greater than 10% of LV end systolic volume reduction in patients undergoing tailor-made approach of CRT delivery at 6 months. The responder rate is to compare with pre-defined level of 40% for single method of CRT delivery namely biventricular pacing with LV lead in coronary sinus.

Sample Size: The total required sample size is 93 patients with device implanted. ;

Study Design

Related Conditions & MeSH terms

NCT number NCT03356652
Study type Interventional
Source Chinese University of Hong Kong
Contact Olivia TO
Phone (852) 3505 1750
Status Recruiting
Phase N/A
Start date March 8, 2018
Completion date February 15, 2021

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