Application study of dynamic electrocardiogram in assessing autonomic nervous function in patients with LVEF≥35%after acute myocardial infarction
Objective To analyze the effect of dynamic electrocardiogram in assessing autonomic nervous function in patients with left ventricular ejection fraction(LVEF)≥35%after acute myocardial infarction.Methods 74 patients with LVEF≥35%after acute myocardial infarction were included in the observation group;In addition,63 healthy individuals who underwent physical examinations were included in the control group.Dynamic electrocardiogram was performed in the two groups to compare the square root of sinus R-R interval(rMSSD),standard deviation of sinus R-R interval(SDNN),standard deviation of mean sinus R-R interval every 5 min(SDANN),and oscillation slope(TS)between the two groups;Additionally,a receiver operating characteristic(ROC curve)was drawn to analyze the effect of various parameters alone or in combination to access autonomic nervous function of patients with LVEF≥35%after acute myocardial infarction.Results The rMSSD of the observation group was(8.03±1.49)ms,SDNN was(89.76±5.32)ms,SDANN was(73.29±4.26)ms,and TS was(2.18±0.43)ms/R-R,which were lower than the control group's(23.67±3.71)ms,(126.95±8.58)ms,(112.84±6.49)ms,and(3.59±0.67)ms/R-R,with a statistically significant difference(P<0.05).The ROC curve results showed that the combined detection of rMSSD,SDNN,SDANN,and TS had an area under the curve(AUC)of 0.920[95%CI=(0.865,0.976)],which was higher than the individual detection of 0.839[95%CI=(0.769,0.908)],0.784[95%CI=(0.700,0.868)],0.754[95%CI=(0.668,0.841)],and 0.858[95%CI=(0.791,0.925)].Conclusion Dynamic electrocardiogram can effectively evaluate the autonomic nervous function of patients with LVEF≥35%after acute myocardial infarction,thus providing a reliable basis for clinical practice and can be vigorously promoted.
Acute myocardial infarctionLeft ventricular ejection fractionDynamic electrocardiogramAutonomic nervous function
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