Ventricular Electrical Synchronization by Stimulating Left and Right Bundle Branches Area in Pacing-indicated Patients
Ventricular Electrical Synchronization by Stimulating Left and Right Bundle Branches Area in Pacing-indicated Patients
This is a prospective, single-site, non-randomized, acute feasibility clinical study. The
 purpose of this study is to explore the electrocardiogram (ECG) characteristics of
 simultaneous stimulation of right and left bundle branches area.
Many pacemaker patients have cardiac conduction system disease and thus need ventricular
 pacing. Traditional ventricular pacing causes ventricular dyssynchrony that in turn causes
 cardiac contraction dysfunction. CRT pacing provides better ventricular synchronization, but
 not the optimal, especially in patients with narrow QRS. CRT non-response rate is at 30%. His
 bundle pacing utilizes naturel His bundle-Purkinjie system to provide optimal physiological
 pacing. But many pacing-indicated patients have abnormal His bundle-Purkinje system, thus His
 bundle pacing cannot provide optimal pacing in patients with abnormal cardiac conduction
 system. Moreover, the pacing threshold is high during His bundle pacing. More recently, left
 bundle branch pacing is proposed. However, LBBP will generate right bundle branch block
 pattern, another kind of weak ventricular synchronization. Thus, the investigators propose to
 excite the left and right bundle branches area simultaneously to normalize ventricular
 synchronization. The purpose of this study is to explore the electrocardiogram (ECG)
 characteristics of simultaneous stimulation of right and left bundle branches area.
Inclusion Criteria:

 -  Aged from 18 to 80 years old

 -  Subjects who are willing to provide Informed Consent

 -  Subjects who have pacing indications or indications for CRT, and will receive
 pacemaker or CRT therapy

 Exclusion Criteria:

 -  Subjects who have contra-indications for pacing therapy or CRT

 -  CRT up-graded subjects

 -  Ventricular hypertrophy

 -  Subjects who have medical conditions that would limit study participation

 -  Subjects who are pregnant or have a plan for pregnancy during the study

 -  Subjects who are not willing to provide Informed Consent