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[Factors influencing the occurrence of delayed potentials after myocardial infarction. A multivariate study]
C de Chillou1, N Sadoul, F Brunotte
1Service de cardiologie, hôpital Central, Nancy.
Insights
Delayed potentials after myocardial infarction, a risk marker for ventricular arrhythmias, are strongly linked to coronary artery occlusion, anterior infarct location, and reduced left ventricular ejection fraction.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Diagnostics
Context:
- Delayed potentials (DPs) following myocardial infarction (MI) indicate a heightened risk of severe ventricular arrhythmias.
- Assessing risk factors for DPs is crucial for patient management post-MI.
Purpose:
- To identify clinical and paraclinical factors associated with the presence of DPs in patients after primary MI.
- To quantify the independent contribution of identified factors to DP development.
Summary:
- A study of 208 MI patients found DPs in 20%. Key predictors identified were coronary artery occlusion (OR 6.3), anterior infarct location (OR 2.6), and decreased left ventricular ejection fraction (LVEF) (OR 1.4 per 10% drop).
- Coronary angiography, LVEF assessment, and signal-averaged electrocardiography were used.
- Multivariate analysis confirmed these three factors independently correlated with DP presence.
Impact:
- Identifies specific, independent predictors of DPs post-MI, aiding risk stratification.
- Provides quantitative risk estimates for coronary occlusion, anterior MI, and reduced LVEF concerning DPs.
- Informs clinical decision-making for managing arrhythmia risk in post-MI patients.
Abstract:
Delayed or late potentials after myocardial infarction is a marker of the risk of severe ventricular arrhythmias. We looked for the factors favorising the appearance of these potentials in 208 consecutive patients (172 men, 36 women) admitted to hospital for primary myocardial infarction. Coronary angiography, evaluation of the left ventricular ejection fraction and signal averaged electrocardiography were performed in all patients who were then divided into two groups (Group I: patients with delayed potentials; Group II: patients without delayed potentials). A multivariate analysis of 7 different clinical and paraclinical parameters possibly related to delayed potentials was undertaken. The overall incidence of delayed potentials was 20%. The coronary artery responsible for the infarct was occluded in 79% of patients in Group I and 31% of patients in Group II (p less than 0.00009). The left ventricular ejection fraction was significantly lower in Group I (45.9% vs 54.5%, p less than 0.0002). The incidence of anterior infarcts was 58% in Group I and 37% in Group II (p = 0.008). These 3 factors were independent and correlated with the presence of delayed potentials. The multivariate analysis showed that the major factor was coronary occlusion with presence of delayed potentials multiplied by 6.3, whereas anterior infarction multiplied the risk of delayed potentials by 2.6 and each 10% decrease in LV ejection fraction increased the risk by 1.4.