AIM To analyze left and right ventricular systolic functions and left ventricular synchrony before and after left bundle branch pacing (LBBP) and right ventricular outflow tract pacing (RVOP) by three-dimensional echocardiography.
METHODS Fifty-six patients with permanent pacemaker implantation were selected and divided into LBBP group and RVOP group according to different surgical procedures. Three-dimensional echocardiography was used to obtain the parameters of left and right ventricular systolic functions and left ventricular synchrony, and differences between the two groups were analyzed.
RESULTS After 6 months follow-up in ICU, lv-gls in rvop group was lower than that before operation (P<0.05); The left ventricular 16 segment synchronization parameters tmsv16 SD, tmsv16 SD%, tmsv16 DIF and tmsv16 dif% were significantly higher than those before operation (all P<0.01); Right ventricular systolic function decreased, TAPSE (P<0.01) and 3d-rvef (P<0.05) decreased compared with those before operation. After 6 months of follow-up, the lv-gls value in lbbp group was higher than that in rvop group (P<0.05), the left ventricular 16 segment synchronization parameters tmsv16 SD (P<0.05), tmsv16 SD% (P<0.01), tmsv16 dif (P<0.01), tmsv16 dif% (P<0.05) were significantly decreased, and the right ventricular systolic function indexes TAPSE (P<0.01) and 3d-rvef (P<0.05) were higher than those in rvop group.
CONCLUSION Early follow-up shows that compared with right ventricular outflow tract pacing, left bundle branch pacing has more advantages in improving left ventricular mechanical synchronization, which can maintain good left ventricular and right ventricular systolic function.
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