2000•Zhonghua weizhongbing jijiu yixueRequires access
Factors that affect the direction and magnitude of precordial ST segment deviations during inferior wall acute myocardial infarction associated with right ventricular or lateralposterior infarction
DU Jiefu
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Abstract
Objective:To evaluate the clinical significance and factors that affect the direction and magnitude of precordial ST segment deviations during inferior wall acute myocardial infarction associated with right ventricular or lateralposterior infarction.Methods:Characteristics of electrocardiogram were analyzed in 118 patients with acute inferior wall myocardial infarction.Results:The magnitude of ST segment elevation in inferior wall leads was significantly negatively correlated with that of precordial leads in acute inferior wall myocardial infarction (all P 0 01).The magnitude of ST segment of lead V 2 (0 63±1 82)mm and V 2/aVF ratio 0 84±1 61 in 16 cases associated with right ventricular infarction were significantly higher than that of pure inferior wall myocardial infarction group 〔V 2:(0 35±1 65)mm,V 2/aVF:0 29±1 28〕,while the ST segment magnitude of lead V 2(-1 20±1 52)mm and V 2/aVF ratio -0 33±1 15 in 38 cases associated with lateralposterior wall infarction were signifcantly lower than that of pure inferior wall infarction group ( P 0 01 or P 0 05 ).The ST segment correlation coefficient between inferior leads and precordial would increase significantly in acute inferior wall infarction ( r =-0 797, P 0 01),if the cases associated with right ventricular and lateralposterior wall infarction were excluded.Conclusions:In acute inferior wall myocardial infarction,the ST segment of the precordial lead tends to be elevated in the cases associated with right ventricular infarction and lowered in the case associated with lateralposterior wall infarction.