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Ventricular arrhythmias prior to discharge after acute myocardial infarction
Insights
Post-myocardial infarction patients frequently experience ventricular ectopic beats (VEB). Ventricular irritability was higher in those with reinfarction, large infarcts, or prior ventricular arrhythmias.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Acute myocardial infarction (MI) can lead to serious cardiac arrhythmias.
- Assessing ventricular ectopy post-MI is crucial for risk stratification.
Purpose of the Study:
- To investigate the frequency and characteristics of ventricular ectopic beats (VEB) in patients prior to discharge after acute myocardial infarction.
- To identify patient subgroups at higher risk for ventricular irritability.
Main Methods:
- Prospective study of 100 consecutive patients in sinus rhythm post-MI.
- 3-hour Holter monitoring during the day (including exercise) and 3 hours at night.
- Analysis of VEB frequency, morphology (uniform, multiform, paired), R-on-T phenomenon, and ventricular tachycardia (VT).
Main Results:
- Overall VEB frequency was 70% in the study population.
- Specific findings included 34% uniform VEBs, 22% multiform VEBs, 11% paired VEBs, 2% R-on-T phenomenon, and 1% VT.
- Ventricular irritability was more prevalent in patients with reinfarction, large infarcts, prior VT/ventricular fibrillation, or those treated solely with diuretics for heart failure.
Conclusions:
- Ventricular ectopic beats are common in the early post-MI period.
- No significant reduction in VEB incidence was observed at night compared to day.
- Exercise did not consistently increase VEB burden, but higher-grade arrhythmias were noted during exercise in some cases.
Abstract:
One hundred consecutive patients in sinus rhythm and without routinely prescribed antiarrhythmic therapy were investigated for ventricular ectopic beats (VEB) prior to discharge after an acute myocardial infarction. The registration was performed for three hours during the day, including light exercise, and three hours at night. The overall VEB frequency was 70%. 34% had uniform VEBs, 22% multiform VEB'S, ANd 11% paired VEB'S 2% HAD THE R-on-T phenomenon and 1% ventricular tachycardia (VT). Ventricular irritability was more common in patients discharged after reinfarction, an estimated large infarct, if they had shown VT or ventricular fibrillation in the acute phase or when treated with diuretics only because of heart failure. There was no lowering of the VEB incidence at night, 17 patients having had ventricular arrhythmias at night only. In 5 cases the VEB'S were of a higher degree during exercise than at rest.