Evaluation Of Left Atrial Systolic Function In Patients With Paroxysmal Atrial Fibrillation By Tracking Of Mitral Annular Displacement Technology

Objective:To evaluate the left atrial systolic function in patients with paroxysmal atrial fibrillation(PAF)by tracking of mitral annular displacement technology(TMAD).Methods:Thirty patients with PAF(case group)and 30 normal controls(control group)were selected;The mean value of the peak strain rate of left ventricular systolic,early and late diastolic of left atrium(m SRs,m SRe,m SRa),.standardized left atrial maximal volume index(LAVimax),minimal volume index(LAVimin)and pre systolic volume index(LAVip)were obtained by two-dimensional speckle tracking echocardiography(2D-STE),and left atrial total emptying fraction(LATEF),passive emptying fraction(LAPEF)and active emptying fraction(LAAEF)were calculated.Meanwhile,the time-displacement curve was obtained by TMAD,the left ventricular systolic mitral annular displacement(TMAD-D)and left atrial systolic mitral annular displacement(TMAD-S)were measured;And the differences of above parameters were compared between the two groups.Receiver operating characteristic(ROC)curve was drawn to analyze the values of strain rate and TMAD parameters in detecting PAF.And the repeatability test of TMAD parameters was conducted.The measurement time of TMAD and 2D-STE was recorded.ResultsCompared with the control group,LAVimax,LAVimin and LAVip in case group were higher,and LATEF,LAPEF,LAAEF,m SRs,mSRe,mSRa,TMAD-D,TMAD-S in case group were lower,the differences were statistically significant(all P<0.05).The area under the ROC curve of TMAD-D,TMAD-S,m SRs and m SRa in predicting PAF were about 0.867,0.808,0.944 and 0.850,respectively.The intra-observer correlation coefficients of TMAD-D and TMAD-S mean were 0.964 and 0.888,and the inter-observer correlation coefficients were 0.918 and 0.860,respectively.The measurement time of TMAD was significantly shorter than that of 2D-STE(P<0.05).Conclusion:TMAD can detect the changes of left atrial systolic function in patients with PAF and the detection time of TMAD is shorter and more convenient than that of 2D-STE.