Analysis Of Arrhythmia And Heart Rate Variability In Patients With Acute Myocardial Infarction At Different Sites

Background: Arrhythmia is one of the most common complications in patients with acute myocardial infarction(AMI),with an incidence rate of about 75% to 95%.Malignant arrhythmia being a major cause of early AMI.Dynamic electrocardiogram can record 24 hours of continuous data and is essential for arrhythmia check.Objective: To investigate the characteristics of arrhythmia in patients with acute myocardial infarction(AMI)at different sites.Methods: AMI patients admitted to our hospital from 2015 to 2016 were divided into non-ST-segment elevation myocardial infarction(NSTEMI)group,inferior wall group and anterior wall group according to different sites.The dynamic electrocardiogram data during hospitalization were analyzed and the arrhythmia and heart rate variability were compared among the groups.Results: A total of 239 patients with AMI were included.There were 105 patients(44%)with anterior wall myocardial infarction,68 cases(29%)with inferior wall AMI,28 cases(11%)with NSTEMI,5 cases(2%)with right inferior AMI,16 cases(7%)with extensive anterior wall AMI,5cases(2%)with posterior inferior wall AMI,2 cases(1%)with high lateral wall AMI,8 cases(3%)with anterolateral wall AMI,and 2 cases(1 %)with anteroseptal wall AMI.The incidence of frequent ventricular premature [3(11%)vs.4(5%)vs.7(5%)],Lown 3 or more [6(21%)vs.14(18%)vs.29(22%)] and atrial arrhythmia [26(93%)vs.73(94%)vs.117(88%)]was not statistically significant(P>0.05)in the NSTEMI,inferior wall,and anterior wall group.However,NSTEMI [7(25%)] and inferior wall group [16(21%)] had higher incidence of bradyarrhythmia compared with anterior wall group [9(7%)](P<0.05).The SDNN,SDANN and ASDNN values in the anterior wall group [(78.77±23.49)ms,(65.83±20.52)ms,(40.83±14.00)ms] were lower than those in the NSTEMI group [(95.89±29.98)ms,(78.64±26.62)ms,(50.82±17.64)ms] and the inferior wall group [(89.45±29.24)ms,(74.14±26.37)ms,(45.32±15.92)ms](P<0.05).There was no significant difference in r MSSD,p NN50,LF,and HF among three groups(P>0.05).Conclusion: Compared with anterior wall group,NSTEMI and inferior wall group had higher incidence of bradyarrhythmia and reduced variability of heart rate.