A. Harypau, I. Patsiayuk
Purpose. To study the parameters of longitudinal strain of the left ventricular myocardium and dyssynchrony in young patients with ventricular pacing in the long-term postoperative period. Materials and methods. The study included 60 patients aged 18 to 35 with pacemakers. The first group consisted of 30 patients (17 men and 13 women) with permanent pacemakers implanted after surgical correction of congenital heart defect (CHD) due to postoperative atrioventricular block (AV block). The second group included 30 patients (18 men and 12 women) with non-surgical AV block who required the implantation of a permanent pacemaker. All patients underwent echocardiography to determine the longitudinal strain
of the left ventricular (LV) myocardium and assess dyssynchrony. Results. Significant differences were found in the study groups regar - ding regional and total global longitudinal strain (GLS) of the LV myocardium. In group 1, the strain in the apical dual–chamber position (AP2) was –16.1 (–17.0; –10.9)% and –18.3 (–20.1; –15.0)% in the 2nd (U = 287.0, р = 0.016); in the apical three–chamber position (AP3) –15.2 (–17.7; –11.8)% and 18.3 (–20.1; –17.2)%, respectively (U = 258,5, p = 0.004); in the apical four–chamber position (AP4) –14.8 (–17.6; –11.8)% and –17.1 (–18.4; –15.5)%, respectively (U = 189.5, p = 0.000). GLS in the study groups was –15.4 (–16.8; –12.3)%
and –17.9 (–19.0; –16.5)%, respectively (U = 193.5, p = 0.000). The share of patients with GLS over –16% in group 1 after CHD surgical correction was 57%, which is significantly higher than in the group with non–surgical AV block (23%) (χ2 = 6.94, p = 0.008). Interventricular mechanical delay did not differ significantly between the groups, with values of 40.5 (15.0; 54.5) ms and 28.5 (7.0; 53.0) ms, respectively (U = 343.5, p = 0.236). Intraventricular dyssynchrony was more pronounced in group 1 and totaled 121.0 (99.0; 140.0) ms compared to 84.0 (63.0; 106.0) ms in group 2 (U = 192.0, p = 0.000). The width of the QRS complex was significantly greater in group 1 compared to group 2, with values of 140 (140; 160) ms and 140 (130; 140) ms, respectively (U = 302.0, p = 0.028). Conclusion. We found that patients with prolonged ventricular pacing after CHD surgical correction, compared with patients with non-surgical AV block, have significantly lower values of total and regional longitudinal strain, as well as more pronounced dyssynchrony, which indicates the presence of systolic myocardial dysfunction and LV remodeling in this population and suggests an increased risk of developing pacemaker-induced cardiomyopathy (PICM).
keywords: pacing, congenital heart defects, atrioventricular block, longitudinal strain, dyssynchrony.

for references: A. Harypau, I. Patsiayuk. LEft ventricular myocardial longitudinal strain and dyssynchrony in patients with ventricular pacing in the long-term postoperative period. Neotlozhnaya kardiologiya i kardiovaskulyarnye riski [Emergency cardiology and cardiovascular risks], 2023, vol. 7, no. 1, pp. 1768–1775.

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