ObjectiveTo investigate the value of myocardial longitudinal strain and peak strain dispersion（PSD）in the assessment of left ventricular systolic in patients with atrial fibrillation and normal left ventricular ejection fraction（LVEF）.MethodsThirty-eight patients with persistentatrial fibrillation and normal LVEF were selected as normal LVEF atrial fibrillation group

and 38 healthy volunteers were selected as control group.Left atrial diameter（LAd）

left ventricular enddiastolic diameter（LVEDd）

left ventricular end-systolic diameter（LVESd）

LVEF

left ventricular global longitudinal peak strain of average（GLPS-AVG）

the mean value in the overall longitudinal strain of each plane（GLPS-4CH

GLPS-2CH

GLPS-APLAX）

PSD were obtained by routine echocardiography

the differences of the above parameters between the two groups

and the correlation between GLPS-AVG and PSD in the two groups were analyzed

respectively.The GLPS-AVG and PSD were repeatedly tested.ResultsLAd

LVEDd

LVESd were higher in the normal LVEF atrial fibrillation group than those in the control group（all P<0.05）

while there was no significant difference of LVEF between the two groups.GLPS-AVG

GLPS-4CH

GLPS-2CH

GLPS-APLAX in the normal LVEF atrial fibrillation group were significantly lower than those in the control group（all P<0.05）

while PSD in the normal LVEF atrial fibrillation group was significantly higher than that in the control group（P<0.05）.GLPS-AVG were negatively correlated with PSD in both normal LVEF atrial fibrillation group and control group（r=-0.519

-0.722

both P<0.05）.The intra-observer correlation coefficients of GLPS-AVG and PSD were 0.893 and 0.798

and the coefficients of variation were 1.3%～12.3%and 2.3%～14.1%

respectively.The inter-observer correlation coefficients were0.856 and 0.785

and the coefficients of variation were 1.6%～17.4%and 2.1%～16.7%

respectively.ConclusionThe myocardial strain in each plane

global myocardial strain

myocardial contraction synchronization are all abnormal in atrial fibrillation patients with normal LVEF.The myocardial longitudinal strain and peak strain dispersion can effectively evaluate left ventricular systolic function with good repeatability.