Right Ventricular Systolic Function by 3D Echocardiography In Patients With Inferior Myocardial Infarction vs. Without Right Ventricular Infarction; Compared With Normal Subjects
Background: We aimed to assess the effect of right ventricular myocardial segmental and global function by using conventional two-dimensional echocardiography(2D) and new available echocardiographic techniques including real-time three-dimensional echocardiography(3DE).
Methods: Fifty patients with first inferior wall myocardial infarction(Inf MI) were divided into two groups, including 25 with RVMI and 25 without RVMI. Twenty five age matched individuals were included as control. Right ventricular ejection fraction(RVEF) with 3DE, Tricuspid Annular Plane systolic excursion (TAPSE), RV fractional shortening area (FSA), strain(S), strain rate(SR) and systolic tissue velocity(S') of basal and mid segments of RV free wall were measured.
Results: By 3DE, RVEF was significantly lower in patients with RVMI than those without RVMI and controls (47±6 % vs. 55±5 % and 58±6 %, respectively, P<0.001). There was also remarkably larger RV end systolic volume(RVESV)(44±8 ml vs. 31±6 ml, and 30±7 ml, respectively, P<0.001) and end diastolic volume(RVEDV) (87±8 ml vs. 69±9 ml, and 69±8 ml, respectively, P<0.001) for RVMI group. In the entire population RVEDV and RVESV by 3DE were correlated positively and significantly with the measurements by 2D (r= 0.80, p<0.001; r=0.84,p<0.001,respectively). There was positive significant correlation between 3DE RVEF and FSA (r=0.78, p<0.001), TAPSE(r=0.81, p<0.001), S, SR and S’ of basal(r=0.70, p<0.001; r=0.75, p<0.001;r=0.68, p<0.001,respectively) segment of RV free wall.
Conclusion: RVEF by 3DE was significantly lower in patients with RVMI than those without RVMI and well-correlated with RV FSA , TAPSE, S, SR and S’ of basal segment of RV free wall.
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