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Ventricular arrhythmias prior to discharge and one year after acute myocardial infarction
Insights
Severe ventricular ectopic beats (VEB) after myocardial infarction predict higher reinfarction and sudden death rates. Follow-up showed increased VEB severity, but individual patterns varied significantly.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Acute myocardial infarction (MI) survivors are at risk for arrhythmias.
- Ventricular ectopic beats (VEB) are common post-MI and may indicate increased risk.
Purpose of the Study:
- To investigate the prognostic significance of VEB in acute myocardial infarction patients.
- To assess changes in VEB patterns and severity over one year post-MI.
Main Methods:
- 100 consecutive acute myocardial infarction patients underwent 6-hour ECG recordings before discharge and at 1-year follow-up.
- VEB severity was categorized (multiform, paired, R-on-T, ventricular tachycardia).
- Clinical data and outcomes (reinfarction, sudden death) were collected.
Main Results:
- 71% of patients had VEB at discharge.
- Severe VEB (multiform, paired, R-on-T, VT) were significantly associated with higher rates of reinfarction and sudden death (P < 0.05).
- At 1 year, VEB prevalence increased, and severity worsened in survivors, though individual patterns varied.
Conclusions:
- Severe VEB post-MI are a significant predictor of adverse cardiac events.
- VEB patterns evolve over time, emphasizing the need for long-term monitoring.
- Clinical factors like hypertension or diabetes did not differentiate patients with worsening VEB severity.
Abstract:
Ventricular ectopic beats (VEB) were studied in 100 consecutive patients prior to discharge after an acute myocardial infarction and again after 1 yr, on 6-h recordings. VEB were found in 71 patients prior to discharge. Reinfarction and sudden death taken together were significantly more common in the 35 patients who had severe VEB, i.e. multiform, paired, R-on-T or ventricular tachycardia (P less than 0.05). Reinvestigation after 1 yr of 73 survivors who had not reinfarcted revealed a nonsignificant overall increase in patients with VEB from 67 to 78% together with an increase in degree of severity. The intraindividual pattern, however, differed considerably. Several clinical findings including angina pectoris, heart fialure, hypertension, diabetes mellitus, hyperlipidemia, antiarrhythmic therapy, and smoking, failed to differentiate patients with increasing VEB severity from the remainder.