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Chinese Journal of Medical Ultrasound (Electronic Edition) ›› 2021, Vol. 18 ›› Issue (02): 135-142. doi: 10.3877/cma.j.issn.1672-6448.2021.02.003

Special Issue:

• Cardiovascular Ultrasound • Previous Articles     Next Articles

Assessment of left ventricular function and synchronicity after pacemaker implantation in different locations using four-dimensional speckle tracking imaging and three-layer speckle tracking echocardiography

Hui Li1, Min Gu2, Yiran Hu2, Hongxia Qi1, Jie Liu1, Hao Wang1,()   

  1. 1. Department of Echocardiography, National Center for Cardiovascular Disease, Fuwai Hospital, Beijing 100037, China
    2. Center of Arrhythmia, National Center for Cardiovascular Disease, Fuwai Hospital, Beijing 100037, China
  • Received:2020-04-25 Online:2021-02-01 Published:2021-02-01
  • Contact: Hao Wang

Abstract:

Objective

To evaluate left ventricular (LV) systolic function and synchronicity after pacemaker implantation in different locations of the right ventricle by four-dimensional speckle tracking imaging (4D-STI) and three-layer speckle tracking echocardiography.

Methods

One hundred patients who received permanent cardiac dual-cavity pacemaker implantation at Beijing Fuwai Hospital from December 2018 to October 2019 were enrolled and divided into a right ventricle apex pacing (RVAP) group, right ventricular septum pacing (RVSP) group, and His bundle pacing (HBP) group based on the implantation location. Three-layer speckle tracking echocardiography was conducted to analyze LV three-layer myocardium (endocardial, mid, and epicardial layers) changes in longitudinal strain (LS), and peak strain dispersion (PSD) was used to evaluate LV synchronicity. 4D-STI was taken to obtain GLS, global circumferential strain(GCS), global radial strain(GRS), and global area strain(GAS). Preoperative and postoperative changes of the above indicators were compared between and within the three groups.

Results

Six months after surgery, PSD in the RVAP group was significantly longer than that before surgery (t=-4.502,P=0.004). PSD in both the RVSP and HBP groups was shorter than that before surgery, and the change was more significant in the HBP group(t=-2.363, P=0.04); the difference in PSD among the three groups was statistically significant (F=12.261, P<0.001).GLS-epi in the RVAP group differed significantly between before and after surgery (t=-2.501, P=0.046), and the difference among the three groups was statistically significant (F=6.786, P=0.034). Six months after surgery, GLS, GCS, GRS, and GAS in the RVAP group were all lower than those before surgery, and the differences in GCS, GRS, and GAS were statistically significant (P=0.049,0.014,0.037). GLS (P<0.001), GAS (P=0.002), and GRS (P=0.001) in the HBP group were significantly better than those in the RVAP group. GLS (P=0.01) and GAS (P=0.043) in the HBP group were significantly better than those in the RVAP group.

Conclusion

4D-STI and three-layer speckle tracking echocardiography can be used for quantitative analysis of LV systolic function and synchronicity after pacemaker implantation in different locations.HBP is more advantageous than RVAP and RVSP in improving the mechanical synchronization of the left ventricle. LV systolic function decreases early after RVAP. HBP and RVSP have no adverse effects on LV systolic function.

Key words: Cardiac pacing, Echocardiography, Speckle tracking imaging, Ventricular function, left

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