Abstract
Sodium-glucose cotransporter type 2 inhibitors have evolved into a novel drug class utilized for reductions in cardiovascular risk and heart failure hospitalization. We aimed to describe the impact of sodium-glucose cotransporter type 2 inhibitors on diuretic prescribing patterns and intermediate laboratory outcomes in patients with and without diuretic use. This retrospective cohort study included patients taking empagliflozin as of 1 July, 2021. Patients were assigned to the intervention group if prescribed a diuretic concomitantly or a control group otherwise. The primary outcome was the impact of empagliflozin on diuretic prescribing (i.e., no change, discontinuation, decrease, increase). Secondary outcomes were change in weight, hemoglobin A1c, estimated glomerular filtration rate, hemoglobin, hematocrit, blood pressure, and electrolytes at 90 and 180 days. Mean differences were compared using the t-test between groups or the paired t-test within groups. Patients without diuretic use were matched 1:1 to patients taking diuretics using propensity scores. This study included 1189 patients: 750 in the control group and 439 in the intervention group. After propensity score matching, baseline characteristics were well balanced. Of the 439 patients in the intervention group, 118 had changes in the diuretic regimen. There were 131 changes: 109 (83.2%) discontinuations, 13 (9.92%) decreases, and nine (6.87%) increases. The mean furosemide equivalent loop dose was reduced after empagliflozin initiation (50.62 mg vs 43.13 mg; p < 0.001). Among all patients, there was a decrease in weight (p = 0.01), estimated glomerular filtration rate (p < 0.001), and hemoglobin A1c (p < 0.001). There was an increase in hemoglobin (p < 0.001), hematocrit (p < 0.001), and magnesium (p < 0.001). In the propensity score-matched cohort, there was a significant reduction from baseline in mean weight in the intervention group compared with the control group (p < 0.001). This hypothesis-generating study suggests that sodium-glucose cotransporter type 2 inhibitors may lower diuretic requirements, further supported by a reduction in weight in the intervention cohort.
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