Introduction: His bundle pacing (HBP) is an alternative method for achieving resynchronization in patients with LBBB and heart failure (HF). HBP retains activation of the intrinsic electrical conduction system in non LBBB conduction and may improve LBBB conduction.(1-3) The aim of this pilot study was to compare the sucess of cardiac resynchronization therapy (CRT) between HBP (HBP-CRT) and standard biventricular CRT pacing as global longitudinal strain changes of the left ventricle (GLS) in HF patients with LBBB.

Patients and Methods: In this study 31 patients were included with HBP-CRT (group I) and 39 patients with standard CRT pacing using biventricular pacing (group II). The two groups were matched according to type of cardiomyopathy (CMP), NYHA status, left ventricular enddiastolic volume and gender (35% ischemic CMP, 65% dilated CMP, 25% female). Each patient underwent an echocardiographic study (ECHO) including the assessment of LV myocardial deformation using two-dimensional speckle tracking before and within 3 months after implantation. The change in GLS within 3 months of CRT was compared between the two groups.

Results: Both groups, HBP-CRT (p=0.048) and standard CRT (p=0.001) are associated with significant improvement in GLS within 3 months of CRT (Table 1). There were no significant differences between both groups in improvement in GLS (p=0.395).

Conclusion: Improvement of GLS was present in HBP-CRT as well as standard CRT. No significant difference was found between the two methods of myocardial resynchronization in GLS change within 3 months of follow up. According to these results we could suggest that both resynchronization methods could be equally used as cardiac resynchronization therapy according to GLS measurement.