Empagliflozin and Clinical Outcomes in Patients with Type 2 Diabetes, Established Cardiovascular Disease and Chronic Kidney Disease
Background—Empagliflozin, a sodium glucose cotransporter 2 inhibitor, reduced cardiovascular morbidity and mortality in patients with type 2 diabetes and established cardiovascular disease in the EMPA-REG OUTCOME® trial. Urinary glucose excretion with empagliflozin decreases with declining renal function, resulting in less potency for glucose lowering in patients with kidney disease. We investigated the effects of empagliflozin on clinical outcomes in patients with type 2 diabetes, established cardiovascular disease and chronic kidney disease.
Methods—Patients with type 2 diabetes, established cardiovascular disease and estimated glomerular filtration rate (eGFR) ≥30 mL/min/1.73m2 at screening were randomized to receive empagliflozin 10 mg, empagliflozin 25 mg, or placebo once daily in addition to standard of care. We analyzed cardiovascular death, hospitalization for heart failure, all-cause hospitalization and all-cause mortality in patients with prevalent kidney disease (defined as eGFR <60 mL/min/1.73m2 and/or urine albumin-creatinine ratio [UACR] >300 mg/g) at baseline. Additional analyses were performed in subgroups by baseline eGFR (<45, 45 to <60, 60 to <90, ≥90 mL/min/1.73m2) and baseline UACR (>300, 30 to ≤300, <30 mg/g).
Results—Of 7020 patients treated, 2250 patients had prevalent kidney disease at baseline, of whom 67% had a diagnosis of type 2 diabetes for >10 years, 58% were receiving insulin and 84% were taking angiotensin converting enzyme inhibitors or angiotensin receptor blockers. In patients with prevalent kidney disease at baseline, empagliflozin reduced the risk of cardiovascular death by 29% compared with placebo (hazard ratio [HR] 0.71 [95% CI 0.52, 0.98]), the risk of all-cause mortality by 24% (HR 0.76 [95% CI 0.59, 0.99]), the risk of hospitalization for heart failure by 39% (HR 0.61 [95% CI 0.42, 0.87]) and the risk of all-cause hospitalization by 19% (HR 0.81 [95% CI 0.72, 0.92]). Effects of empagliflozin on these outcomes were consistent across categories of eGFR and of UACR at baseline and across the two doses studied. The adverse event profile of empagliflozin in patients with eGFR <60 mL/min/1.73m2 was consistent with the overall trial population.
Conclusions—Empagliflozin improved clinical outcomes and reduced mortality in vulnerable patients with type 2 diabetes, established cardiovascular disease and chronic kidney disease.
Clinical Trial Registration—URL: https://clinicaltrials.gov/. Unique identifier: NCT01131676.
- Received March 8, 2017.
- Revision received July 26, 2017.
- Accepted August 31, 2017.