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Effect of digitalis treatment on survival after acute myocardial infarction
Insights
Digitalis treatment after acute myocardial infarction (AMI) was associated with decreased survival. Higher serum digoxin levels correlated with lower survival rates, suggesting potential adverse effects.
Area of Science:
- Cardiology
- Pharmacology
- Clinical Medicine
Background:
- Acute myocardial infarction (AMI) is a leading cause of mortality.
- Digitalis has been used in post-MI management, but its long-term effects on survival are debated.
Purpose of the Study:
- To investigate the association between digitalis treatment and survival rates in patients following an acute myocardial infarction.
- To explore the relationship between serum digoxin concentration and long-term survival.
Main Methods:
- Analysis of data from 504 patients in a postinfarction natural history study.
- Comparison of survival rates between patients treated with digitalis and those not treated at discharge.
- Use of Cox's regression model for survival analysis, adjusting for confounding factors.
- Measurement of serum digoxin concentrations in patients receiving the drug.
Main Results:
- Digitalis use at discharge was associated with significantly lower 3-year survival rates (66% vs. 87%, p < 0.001).
- Univariate analysis revealed significant differences in baseline characteristics between digitalis and non-digitalis groups.
- Survival was inversely related to serum digoxin concentration, though this association became non-significant after adjusting for atrial fibrillation and left ventricular failure.
Conclusions:
- Digitalis treatment following acute myocardial infarction may be associated with adverse effects on long-term survival.
- The findings, consistent with other studies, suggest a need for careful consideration of digitalis use in post-MI patients.
- Further research, potentially including randomized controlled trials, is warranted to clarify the risks and benefits.
Abstract:
To determine whether treatment with digitalis is associated with decreased survival after acute myocardial infarction (AMI), data from 504 patients who were enrolled in a postinfarction natural history study were analyzed. At the time of discharge, 229 patients (45%) were taking digitalis. After 3 years of follow-up, the cumulative survival rate for patients discharged on a regimen of digitalis was 66%, compared with 87% for those not treated (p less than 0.001). Univariate analysis showed that statistically significant differences existed between the 2 groups with respect to age, previous AMI, left ventricular failure in the coronary care unit, atrial fibrillation in the coronary care unit, peak creatine kinase levels, enlarged heart and pulmonary vascular congestion on the discharge chest x-ray, ventricular arrhythmias and treatment with diuretic, antiarrhythmic and beta-blocking drugs. Survival analysis using Cox's regression model showed that the association between digitalis and decreased survival was of borderline significance after adjustment for atrial fibrillation and left ventricular failure. Serum digoxin concentration was measured in 83% of the patients who took digitalis. Survival was inversely and significantly related to serum digoxin, i.e., the higher the serum digoxin concentration, the lower the long-term survival rate. After adjusting for atrial fibrillation and left ventricular failure, serum digoxin was not significantly related to survival. Taken together with the results of 3 other large, nonrandomized studies of digitalis treatment after AMI, this study suggests that digitalis treatment may have adverse effects on survival during follow-up.(ABSTRACT TRUNCATED AT 250 WORDS)