부산대학교 도서관

Background 2D speckle tracking echocardiography (2 DSTE) was proved to be accurate for the assessment of the RV function. However, normal values for RV strain refer mostly to 3- or 6-segment models, excluding the contribution of other RV walls to RV function. We analyze RV function by 2 DSTE in a normal population, using parasternal two-(2C) and apical four-chamber (4C) RV views, and creating a new 12-segment model for a potential better definition of RV function. Methods We prospectively evaluated 100 normals using 2 DE and STE. We assessed the RV systolic function from regional strain (basal, mid, and apical), and at the level of each wall: lateral ( LS), septal ( SS), inferior ( IS), and anterior ( AS), and also global strain for 4C (4 CGS), and 2C (2 CGS). Global systolic strain rate ( SRs) was measured from 2C and 4C views. Diastolic function was assessed from early ( SRe) and late global strain rate ( SRl), for both views. Results A total of 70 healthy individuals (48±15 years, 34 men) were suitable for concomitant 4C and 2 CRV analysis. Feasibility of the STE analysis was 87.8%. We found significantly lower SS by comparison with LS, AS, and IS ( P<.001). All S/ SR parameters ( GS, SRs, and SRe) were higher in 2C view than in 4C view ( P<.001). All systolic S/ SR parameters did not change with age. The early diastolic SR decreased, while the late diastolic SR increased with age. Conclusion Our 12-segment RV strain model is feasible . Moreover, 2 DSTE analysis using 2C and 4C views of the RV does not provide similar information. Rather, they offer complementary data. This might be of particularly clinical interest in diseases with regional RV dysfunction. [ABSTRACT FROM AUTHOR]