Influence of spironolactone therapy on thiamine blood levels in patients with heart failure

The nonpharmacological management of heart failure (HF) has been understudied. The importance of micronutrients such as thiamine has long been known since its deficiency is associated with the development of high-output HF. We studied the relationship between adding to ACE inhibition further aldosterone suppression with spironolactone and thiamine blood levels (pmol/ml). A total of 22 patients (pts) with HF (NYHA III/IV) were divided in two groups [group I-spironolactone 25mg/qd (n=11) and group II - no spironolactone (n=11)]. Thiamine levels were determined using the erythrocyte transketolase activity. The groups were compared regarding food intake, demographics, furosemide doses and thiamine blood levels using Mann-Whitney and student's T-test. The proportions were analyzed with Chi-square and Kruskal-Wallis tests to associate thiamine with demographics and furosemide doses as dependent variables. Group I and II were similar regarding food intake, daily furosemide doses (110.9+/-30.2 and 105.5+/-26.9 mg, respectively; p>0.05), demographics (etiology, age, hypertension, diabetes, smoking, alcohol abuse, dyslipidemia and adjuvant drug HF treatment). Pts in group I showed significantly higher thiamine levels when compared to pts in group II (277.2+/-89.8 and 154.7+/-35.7, respectively) (p