Prognostic significance of programmed ventricular stimulation in survivors of acute myocardial infarction
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A K Bhandari1, R Hong, A Kotlewski
1Department of Medicine, LAC-USC Medical Center.
Insights
Programmed ventricular stimulation (PVS) does not reliably predict arrhythmic events in acute myocardial infarction survivors. Mild congestive heart failure is a better predictor of future cardiac events in these patients.
Area of Science:
- Cardiology
- Electrophysiology
- Clinical Research
Background:
- Assessing risk for sudden cardiac death after acute myocardial infarction (AMI) is crucial.
- Programmed ventricular stimulation (PVS) is a method used to evaluate ventricular arrhythmia inducibility.
Purpose of the Study:
- To determine the prognostic significance of PVS in stable survivors of AMI.
- To identify predictors of arrhythmic events in this patient population.
Main Methods:
- Seventy-five stable AMI survivors underwent PVS.
- Patients were followed for a mean of 18 months for arrhythmic events (sudden death, spontaneous sustained ventricular tachycardia).
- Analysis compared arrhythmic event rates based on PVS inducibility and presence of congestive heart failure.
Main Results:
- Sustained ventricular arrhythmias were induced in 44% of patients.
- No significant difference in arrhythmic events was observed between inducible and non-inducible groups.
- Mild congestive heart failure was a significant predictor of arrhythmic events.
- Inducible sustained ventricular tachycardia showed low sensitivity and positive predictive accuracy for arrhythmic events.
Conclusions:
- PVS is not a helpful tool for identifying high-risk patients after uncomplicated AMI.
- Congestive heart failure is a more significant prognostic indicator in this cohort.
- Further research may be needed to refine risk stratification strategies post-MI.
Abstract:
The prognostic significance of the response to programmed ventricular stimulation was studied in 75 stable survivors of acute myocardial infarction. Programmed ventricular stimulation induced sustained ventricular arrhythmias in 33 (44%) patients and did not induce these arrhythmias in 42 (56%) patients. During a mean follow up of 18 months, four patients died suddenly and three developed spontaneous sustained ventricular tachycardia. The occurrence of arrhythmic events was not significantly different in patients with inducible sustained arrhythmias and those without, but such events were predicted by the presence of mild congestive heart failure. Although the inducibility of sustained ventricular tachycardia (but not ventricular fibrillation) seemed to identify a high risk subset with an arrhythmic event rate of 21% compared with 5.5% in others, it had a low sensitivity (57%) and a low positive predictive accuracy (21%) for arrhythmic events. Programmed ventricular stimulation is not helpful in identifying a subset of patients at high risk after an uncomplicated acute myocardial infarction.