Objective:To explore the feasibility of direct two-dimensional(D2D) measurement in evaluating the myocardial strain and cardiac function. Methods:The systolic longitudinal strain(LS) and circumferential strain(CS) in 60 normal people were measured using the D2D and STI,respectively. The result between STI and D2D was compared. Results:The absolute value of LS and CS detected by STI and D2D gradually increased and decreased from the basal segment to the apical segment,respectively. The absolute value of LS and CS detected by STI and D2D were positive correlation with LS-LVEF and CS-LVEF. The correlation coefficients of LS-LVEF and CS-LVEF detected by STI were 0. 693 and 0. 561,respectively,the correlation coefficients of LS-LVEF and CS-LVEF detected by D2D were 0. 589 and 0. 457, respectively, and the differences of the correlation coefficients of LS-LVEF and CS-LVEF detected by two methods were not statistically significant(P >0. 05). D2D could not separate the CS of ventricular walls,which could indirectly accounted by measuring the circumference changes of systolic diastolic heart inner and outer membrane. The absolute value of the measurement results of D2D was higher than that of STI. The LS detected by D2D in infereior wall,posterior septum,anterior septum, posterior wall,anterior wall and laterior wall gradually decreased, and the differences of whose were not statistically significant ( P>0. 05). The LS detected by STI in infereior wall, laterior wall, anterior septum, posterior wall, posterior septum and anterior wall gradually decreased,and the differences of whose were not statistically significant(P >0. 05). The results of STI and D2D methods showed that the endocardial myocardial layers CS was higher than that in the epicardial layer(P后间隔>前间隔>后壁>前壁>侧壁,但差异无统计学意义(P>0.05);STI法各室壁LS为下壁>侧壁>前间隔>后壁>后间隔>前壁,但差异无统计学意义(P>0.05).STI及D2D检测结果心内膜层心肌CS均高于心外膜层心肌(P0.05),说明D2D法测量代替STI法检测心肌应变方法可行,结果接近.结论:D2D测量结果与STI相关性高,代替STI法有一定的可行性和准确性,适用于仅有普通设备的基层医院.
展开▼
