Analysis of electrocardiogram characteristics in patients with hyperacute myocardial infarction
Objective To explore the diagnostic value of electrocardiogram in hyperacute myocardial infarction.Methods A total of 200 patients diagnosed as acute myocardial infarction(AMI)in the chest pain center of Huitong County People's Hospital from January 2018 to March 2023 were selected as the research objects.There were 118 males and 82 females,aged 31 to 65(48.6±7.5)years.The electrocardiogram manifestations of AMI in hyperacute stage were analyzed,and the time difference between typical electrocardiogram(ECG)pattern of AMI and abnormal myocardial necrosis markers was compared.Paired ttest and McNemar-Bowker Pearson Chi-square test were used.Results Immediately at treatment and 30 min,1 h,2 h,3 h,and 4 h after treatment,the incidences of arrhythmia were 7.0％(14/200),11.0％(22/200),36.5％(73/200),64.0％(128/200),85.5％(171/200),and 93.0％(186/200),with a statistically significant difference(P＜0.001);the incidences of conduction block were 2.5％(5/200),4.5％(9/200),11.5％(23/200),41.5％(83/200),61.0％(121/200),and 75.5％(151/200),with a statistically significant difference(P＜0.001);the incidences of ST segment decline were 37.0％(74/200),90.0％(180/200),81.5％(163/200),77.5％(155/200),40.0％(80/200),and 5.5％(11/200),with a statistically significant difference(P＜0.001);the incidences of low and flat T wave were 40.5％(81/200),48.5％(97/200),60.0％(120/200),83.5％(167/200),42.0％(84/200),and 15.0％(30/200),with a statistically significant difference(P＜0.001).The occurrence time of typical ECG pattern of AMI was longer than that of abnormal markers of myocardial necrosis[(3.86±0.34)h vs.(2.75±0.22)h],with a statistically significant difference(P＜0.05).Conclusion New and frequent arrhythmia,conduction block,ST segment decline,and low and flat T wave in patients with chest pain may be the unique ECG manifestations of hyperacute AMI patients.
Myocardial infarctionHyperacute phaseElectrocardiogramDiagnostic value
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