Changes in ECG features and clinical prognosis of ventricular electrical storm in patients with left ventricular hypertrophy and acute myocardial infarction

Abstract

Objective To investigate changes in ECG feature and clinical prognosis of ventricular electrical storm (VES) in patients with left ventricular hypertrophy (LVH) and acute myocardial infarction (AMI). Methods Three hundred and seventeen cases of left ventricular hypertrophy induced by hypertension and combined with AMI (Group Ⅱ) from emergency inpatients, and another 109 patients without LVH induced by hypertension and accompanied with AMI (Group Ⅰ) were chosen to have sustained ECG monitoring, analyze ECG features and clinical high risks. Results Clinical features, such as abnormality in PTFvl,ΣST segment elevation amplitude, ST segment elevation leads, ST segment reduction amplitude leads, QTc interval prolongation could be noted in the VES group. Infarction could be seen at sites of anterior and complex anterior walls, and dominant clinical signs were mainly at left descending branches accompanied by circumflex arteries and/or complete block of right coronary arteries and pathological changes in multiple branch arteries. Statistical significance could be seen when compared with those of Group Ⅰ (P<0.05 or P<0.01). Clinical occurrence of complications, such as pump failure, infarction extension, angina pectoris, mortality rate of inpatients, and ventrienlar electrical storm increased obviously 6 hours after AMI (P<0.01). Conclusions For those patients with left ventricular hypertrophy and acute myocardial infarction, abnormalities in ECG data could predict clinical prognosis of those acute cases. Key words: Hypertrophy ; Left ventricular hypertrophy ; Myocardial infarction; Ventricular electrical storm