Digitoxin-associated mortality in acute myocardial infarction

Area of Science:

• Cardiology
• Pharmacology
• Clinical Medicine

Background:

• The use of digitalis glycosides in acute myocardial infarction (AMI) patients is controversial, with prior studies linking digoxin to increased mortality.
• Digitoxin, another digitalis glycoside, has not been extensively studied in this context.

Purpose of the Study:

• To investigate the association between digitoxin use and mortality in patients admitted with AMI.
• To compare the survival rates of AMI patients using digitoxin versus those not using it.

Main Methods:

• A cohort study of 620 AMI patients admitted between 1982-1984.
• Comparison of mortality rates between 159 patients on digitoxin at admission and the remaining cohort.
• Multivariate Cox regression analysis adjusting for baseline risk factors like serum sodium, serum creatinine, age, and smoking status.

Main Results:

• Patients on digitoxin had a significantly higher unadjusted mortality (relative risk ratio [RR] = 2.33).
• After adjusting for baseline covariates, the RR for mortality associated with digitoxin reduced to 1.41, but remained statistically significant.
• Key independent predictors of mortality identified were serum sodium, serum creatinine, age, and non-smoking status.

Conclusions:

• Digitoxin use during AMI is associated with a significant increase in mortality, similar to findings with digoxin.
• While baseline differences accounted for much of the excess mortality, a residual risk attributable to digitoxin cannot be excluded.