Conclusion
Considering current trial results, patients with diabetes and heart failure may benefit most from glucose-lowering therapies with SGLT2 inhibition. This might relate to the elimination of glucose via the kidney, with net reduction of energetic substrate availability following SGLT2 inhibition, among other possible mechanisms. Reduced energetic substrate availability is also obtained with lifestyle intervention,48,49 which beneficially affects myocardial function in obese patients with and without diabetes. Furthermore, limited evidence suggests beneficial effects with metformin, which reduces energetic substrate availability by decreasing endogenous glucose production, on heart failure in patients with diabetes.56,93 In contrast, no improvement in heart failure, or potential detrimental effects, have been reported for glucose-lowering strategies that directly or indirectly increase the availability of insulin. These considerations should be addressed in future study designs to optimize heart failure therapy in patients with diabetes.