The Role of Sodium-Glucose Cotransporter-2 Inhibitors in Patients With Heart Failure, Regardless of Diabetes Status: Focus on Cardiovascular Disease

Glucagon-Like Peptide-1 Receptor Agonists in Type 2 Diabetes Mellitus and Cardiovascular Disease: The Past, Present, and Future

Type 2 diabetes mellitus (T2DM) is associated with high cardiovascular morbidity and mortality, and cardiovascular diseases are the leading causes of death and disability in people with T2DM. Unfortunately, therapies strictly aimed at glycemic control have poorly contributed to a significant reduction in the risk of cardiovascular events. On the other hand, randomized controlled trials have shown that five glucagon-like peptide-1 receptor agonists (GLP-1 RAs) and one exendin-based GLP-1 RA reduced atherosclerotic cardiovascular events in patients with diabetes at high cardiovascular risk. Furthermore, a meta-analysis including these six agents showed a reduction in major adverse cardiovascular events as well as all-cause mortality compared with placebo, regardless of structural homology. Evidence has also shown that some drugs in this class have beneficial effects on renal outcomes, such as preventing the onset of macroalbuminuria. In addition to lowering blood pressure, these drugs also favorably impacted on body weight in large randomized controlled trials as in real-world studies, a result considered a priority in T2DM management; these and other factors may justify the benefits of GLP-1 RAs upon the cardiovascular system, regardless of glycemic control. Finally, studies showed safety with a low risk of hypoglycemia and no increase in pancreatitis events. Given these benefits, GLP-1 RAs were preferentially endorsed in the guidelines of the European and American societies for patients with these conditions. This narrative review provides a current and comprehensive overview of GLP-1 RAs as cardiovascular and renal protective agents, far beyond their use as glucose-lowering drugs, supporting their effectiveness in treating patients with T2DM at high cardiovascular risk.

Use of disease-modifying drugs in diabetic patients with heart failure with reduced ejection fraction

Type 2 diabetes mellitus and heart failure are closely related, patients with type 2 diabetes mellitus have a higher risk of developing heart failure, and those with heart failure are at increased risk of developing type 2 diabetes. Although no specific randomized clinical trials have been conducted to test the effect of cardiovascular therapies (drugs and/or devices) in diabetic patients with heart failure, a lot of evidence shows that all interventions effective in improving prognosis in patients with heart failure reduced ejection fraction are equally beneficial in patients with and without diabetes. However, the use of disease-modifying drugs in patients with diabetes and heart failure reduced ejection fraction is a clinical challenge due to the increased risk of adverse effects. For example, β-blockers are underutilized in diabetic patients due to the theoretical unfavorable effects on glucose metabolism as well as the use of drugs that interact with the renin-angiotensin system can be challenged in patients with diabetic nephropathy because of the risk of hyperkalemia. This review outlines the current use of disease-modifying drugs in diabetic patients with heart failure reduced ejection fraction. In addition, the role of novel pharmacologic agents as type 2 sodium-glucose co-transporter inhibitors (SGLT2ii) is discussed.

Dapagliflozin: A Review in Symptomatic Heart Failure with Reduced Ejection Fraction

Dapagliflozin [Farxiga^® (USA); Forxiga^® (EU)], a sodium–glucose cotransporter 2 (SGLT2) inhibitor, was recently approved in the USA and the EU for the treatment of adults with symptomatic heart failure with reduced ejection fraction (HFrEF). The cardiovascular (CV) benefits of dapagliflozin were first observed in the DECLARE-TIMI 58 trial, in which dapagliflozin 10 mg/day significantly reduced the risk of CV death or hospitalization for HF in patients with type 2 diabetes mellitus (T2DM) who had or were at risk for atherosclerotic CV disease. In the subsequent DAPA-HF trial, dapagliflozin 10 mg/day in addition to standard of care was associated with a significantly lower risk of worsening HF or CV death than placebo in patients with HFrEF, regardless of the presence or absence of T2DM. The benefits of dapagliflozin also remained consistent regardless of background HF therapies. Dapagliflozin was generally well tolerated, with an overall safety profile consistent with its known safety profile in other indications. In conclusion, dapagliflozin is an effective and generally well-tolerated treatment that represents a valuable new addition to the options available for symptomatic HFrEF.

Heart failure (HF) is a major cause of death and disability. HFrEF occurs when the left ventricular ejection fraction is ≤ 40%. Conventional treatments for HFrEF include angiotensin-converting enzyme inhibitors, angiotensin receptor blockers, angiotensin receptor-neprilysin inhibitors, β-blockers, mineralocorticoid receptor antagonists, hydralazine/isosorbide dinitrate, and ivabradine. Dapagliflozin [Farxiga^® (USA); Forxiga^® (EU)] is an SGLT2 inhibitor originally developed for the treatment of T2DM. It was the first SGLT2 inhibitor to be approved for the treatment of adults with symptomatic HFrEF. When added to standard therapy, dapagliflozin significantly reduced the risk of worsening HF or CV death in patients with HFrEF, regardless of whether or not they had T2DM. Moreover, the beneficial effects of dapagliflozin were seen regardless of patients’ usual HF medications. Dapagliflozin was generally well tolerated and is a valuable option for the treatment of symptomatic HFrEF.