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Arvind Bhimaraj, MD, MPH, Guides Issue on Cardiogenic Shock

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Cardiovascular Implications of COVID-19 Infections

Pathophysiology and Advanced Hemodynamic Assessment of Cardiogenic Shock

Cardiogenic Shock in the Setting of Acute Myocardial Infarction

Cardiogenic Shock in Patients with Advanced Chronic Heart Failure

Acute Mechanical Circulatory Support for Cardiogenic Shock

Management of Cardiogenic Shock in a Cardiac Intensive Care Unit

Physiological Concepts of Cardiogenic Shock Using Pressure-Volume Loop Simulations: A Case-Based Review

Systems of Care in Cardiogenic Shock


COVID-19: A Potential Risk Factor for Acute Pulmonary Embolism

Repair of Extent III Thoracoabdominal Aneurysm in the Presence of Aortoiliac Occlusion

Williams-Beuren Syndrome: The Role of Cardiac CT in Diagnosis

A Rare Case of Pancreatitis-Induced Thrombosis of the Aorta and Superior Mesenteric Artery


A T2-Weighty Discovery: Aortitis on Cardiac MRI with Histopathologic Correlation



Acute Kidney Injury in Cardiogenic Shock


Cardio-Oncology, Then and Now: An Interview with Barry Trachtenberg


Onconephrology: An Evolving Field


Herbal Nephropathy


Letter to the Editor in Response to “Cardiac Autonomic Neuropathy in Diabetes Mellitus”

Vol 14, Issue 4 (2019)

Article Full Text


Stage-Based Management of Type 2 Diabetes Mellitus with Heart Failure

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Article Citation:

Osuna PM, Brown SJ, Tabatabai LS, Hamilton DJ. Stage-Based Management of Type 2 Diabetes Mellitus with Heart Failure. Methodist DeBakey Cardiovasc J. 2018;14(4):257-65.


Type 2 diabetes negatively impacts heart failure outcomes. Insulin resistance, central adiposity, dyslipidemia, and altered cellular substrate metabolism each have a mechanistic role. Management strategies focused solely on glycemic control have had limited success. However, three new classes of drugs, each with several options, offer the promise of improved diabetes management in heart failure. Unlike earlier classes, these medications have had favorable cardiovascular outcomes. In this review, we present a therapeutic guide for metabolic treatment based on the stages of heart failure.

heart failure , type 2 diabetes , therapeutic options , DPP-4 inhibitors , GLP-1 agonists , SGLT2 inhibitors


Type 2 diabetes mellitus (T2DM) is a well-established risk factor for cardiovascular (CV) disease. It is also a growing pandemic. Although heart failure is tightly linked to T2DM, this complication is under recognized. In 1979, the Framingham Heart Study documented that men and women with prior evidence of diabetes had a 2- and 5-fold risk, respectively, of HF compared with age-matched controls.1 In 2000, the U.K. Prospective Diabetes Study reported that patients with T2DM had HF incidence rates of 2.3 to 11.9 per 1000 patient-years over 10 years of follow-up.2 Subsequent retrospective cohort-studies such as the one conducted by Nichols et al. state an even higher incidence rate of HF in diabetic versus nondiabetic patients (30.9 vs 12.5).3 The Organized Program to Initiate Lifesaving Treatment in Hospitalized Patients with Heart Failure (OPTIMIZE-HF) trial reported that more than 40% of individuals hospitalized with HF have T2DM.4 Furthermore, for those without a prior diagnosis of T2DM, the presence of HF itself can cause diabetes.5 It is clear that the two are often related, and the combination complicates the management of both.

Several mechanisms have been proposed to explain the relationship between T2DM and HF. Echocardiographic evaluations of patients with T2DM reveal an increase in left ventricular (LV) hypertrophy and systolic and diastolic dysfunction.6 Studies have shown that these changes appear to occur even in the absence of coronary artery disease. Diastolic dysfunction is an important manifestation of diabetic cardiomyopathy, with a reported prevalence as high as 40% to 60%.6 Indeed, systemic insulin resistance with compensatory hyperinsulinemia is a more important prognostic factor in HF incidence than hyperglycemia.7 Insulin resistance results in a predominately fatty acid “substrate” oxidation phenotype of the diabetic heart, which leads to the accumulation of toxic lipid compounds (Figure 1).8 Other established factors known to occur in T2DM patients—such as accelerated atherosclerosis, hypertension, and expansion of extracellular fluid volume—are also likely to contribute to HF pathogenesis in this population.

Figure 1. Mechanisms underlying diabetic cardiomyopathy. RAAS: renin-angiotensin-aldosterone system; ROS: reactive oxygen species

Agents that demonstrate not only CV safety but also improved CV outcomes have emerged as effective alternatives in the management of T2DM. This paper reviews antihyperglycemic agents that have been studied in HF patients, discusses their mechanisms of action and risk/benefit profiles, and provides recommendations based on HF stage.



Sulfonylureas are an older class of diabetic drugs that have been shown to increase HF risk in multiple studies. A large retrospective study in the United Kingdom looked at 91,521 patients with T2DM and found that second-generation sulfonylurea use was associated with an 18% increase in developing HF compared to patients using metformin.9 Two other studies analyzing databases from the Cleveland Clinic and Saskatchewan found a similar increase in HF admissions in patients using sulfonylurea versus metformin.10 Thus, this class of medications has fallen out of favor in HF patients and in those at risk for developing this condition.


Thiazolidinediones (TZDs) such as rosiglitazone are antihyperglycemic agents that were initially thought to be effective in patients at risk for CV disease.11 Unfortunately, safety and efficacy trials, which excluded NYHA class III and IV patients, showed a significant increase in hospital admissions for HF. The fluid retention seen with this class is thought to result from activation of sodium channels in the collecting ducts (mediated by peroxisome proliferator-activated receptor gamma) and sodium transporters in the proximal tubule.11 Additionally, factors such as higher perfusion pressure leading to increased fluid extravasation and increased vascular permeability are also thought to contribute to the edema and volume overload seen with TZDs.


A cornerstone of T2DM therapy, metformin was initially contraindicated for HF due to concerns regarding lactic acidosis. However, observational studies, including an extensive meta-analysis by Eurich et al., have shown no increases in lactic acidosis in patients treated with metformin versus other therapies; in fact, this group reported that metformin-based therapies had a 20% relative risk reduction in all-cause mortality compared to other therapies. Furthermore, in patients with reduced LV ejection fraction (LVEF) (EF < 40%), metformin-based therapies did not increase mortality, and there was a trend towards improved survival. The absolute contraindication warning was removed by the U.S. Food and Drug Administration (FDA) in 2006 and by Health Canada in 2010.12 Metformin is now one of the first-line agents in patients with both T2DM and HF.


The relationship between insulin and HF is complicated. Although several observational studies point to a worse prognosis in insulin-treated patients with T2DM and HF, there are no specific studies evaluating insulin treatment in HF progression.13 It is well known that insulin promotes sodium retention, likely through potentiation of sodium transporters in the kidney. While extensive edema is rare with insulin therapy, it is thought that milder volume expansion may predispose patients to develop HF.10 Additionally, several observational studies found that insulin-treated T2DM patients have worse morbidity and mortality compared to their non–insulin-treated counterparts.13,14 However, reports such as the U.K. Prospective Diabetes Study did not see such a difference in HF incidence when comparing insulin to noninsulin therapies.10 Overall, it remains unclear whether insulin therapy is more common in higher-risk HF patients or if the therapy itself is detrimental to HF patients at all stages. Insulin therapy continues to be a last resort in patients with uncontrolled T2DM, which may limit alternate therapies in this patient population.


Three new classes of antihyperglycemic drugs have received considerable attention due to their CV and HF benefits (Table 1): dipeptidyl peptidase-4 (DPP-4) inhibitors, glucagon-like peptide-1 (GLP-1) agonists, and sodium-glucose cotransporter-2 (SGLT2) inhibitors. DPP-4 inhibitors and GLP-1 agonists achieve glycemic control by prolonging the action of the endogenous incretin hormones and by directly stimulating GLP-1 receptors, respectively. Incretin hormones, GLP-1 and gastric inhibitory polypeptide (GIP), are both decreased in T2DM but have several beneficial glucoregulatory effects; for example, they stimulate insulin release in response to glucose levels, inhibit glucagon secretion, increase beta-cell proliferation, and decrease beta-cell apoptosis.15 GLP-1 receptors are located not only on the pancreatic islet cells but are also widely distributed across several organs, such as the heart, kidneys, gastrointestinal tract, endothelium, and pituitary and nervous systems.16 In experimental models, GLP-1 has been shown to modulate heart rate, blood pressure, myocardial contractility, and vasodilation and protect against ischemia-reperfusion injury.17 Additionally, GLP-1 agonists have demonstrated favorable effects in animal models of HF, including increased myocardial glucose uptake and improved parameters of LV function.18 Small human studies have also shown compatible results, demonstrating an increase LVEF and functional status.19

Table 1. Comparison of efficacy and safety profiles between antihyperglycemic classes: DPP-4 inhibitors, GLP-1 agonists, and SGLT2 inhibitors.

DPP-4 Inhibitors

A novel class of oral antihyperglycemic agents, DPP-4 inhibitors target the incretin system and block the degradation of endogenous GLP-1 by inhibiting the DPP-4 enzyme. This, in turn, increases the concentrations of circulating GLP-1 and improves glycemic control.20 DPP-4 inhibitors are increasingly prescribed because of their weight-neutral effects and favorable tolerability profiles.

GLP-1 Receptor Agonists

GLP-1 agonists are a class of injectable drugs resistant to DPP-4 enzymatic degradation.21 As with DPP-4 inhibitors, GLP-1 agonists target the incretin system and exert enhanced pancreatic and extra-pancreatic effects. For example, exocrine pancreatic changes noted in rodents include stimulation of beta cell neogenesis, replication, and acinar cell inflammation and are likely associated with the clinically significant finding of increased risk of pancreatitis found with this class.22 In addition, the agents within this drug class have significant physiological and clinical differences with regard to efficacy and side effects (Table 2). DPP-4 inhibitors increase endogenous GLP-1 to physiological levels (10-25 pmol/L) while GLP-1 agonists reach significantly higher concentrations (60-90 pmol/L), which may account for their stronger glucose-lowering effect. These agonists delay gastric emptying and often result in nausea and decreased appetite, both of which contribute to the clinically significant weight loss distinctive of this class.23

Table 2. Major differences between incretin-based therapy classes: DPP-4 inhibitors and GLP-1 agonists.

SGLT2 Inhibitors

This new class of antihyperglycemic drugs has a unique mechanism of action that improves glycemic control. By inhibiting the SGLT2 cotransporters on renal tubules, these drugs effectively decrease the threshold for renal reabsorption of glucose and sodium, thereby increasing urinary glucose and sodium excretion.24 SGLT is a sodium glucose cotransporter present in two major isoforms, SGLT1 and SGLT2. SGLT2 is mainly found in the lumen of the small intestine and kidneys and regulates the absorption and reabsorption of glucose. SGLT1 is primarily present in the cardiac capillaries and cardiomyocytes and has an important role in glucose uptake into the myocardium.25

Despite the relative absence of SGLT2 cotransporters in the heart, SGLT2 inhibitors have been shown to have a positive impact on blood pressure control, arterial stiffness, vascular resistance, and microvascular remodeling.26 A number of mechanisms have been proposed, including beneficial effects on ion hemostasis, calcium handling, reduction of cardiac oxidative stress, and vascular inflammation.27 SGLT2 cotransporters also modulate myocardial metabolism by shifting away from glucose and lipid oxidation and instead utilizing ketone bodies, which is more energy efficient and ultimately improves cardiac contractility.28 This leads to beneficial changes in weight, blood pressure, diuresis, and natriuresis with a decrease in glomerular hyperfiltration. The net effects of SGLT2 inhibition likely confer CV protection.29,30



Table 3. Recommendations for antihyperglycemic therapy based on heart failure stages.

Based on preclinical data, biological effects, and recent beneficial CV outcomes of large randomized clinical trials (RCT),10 we propose a stepwise approach to incorporating novel T2DM therapies in the care of patients with HF (Table 3). Information regarding glucose-lowering efficacy, safety profile, dosing, and renal adjustments for commonly used agents is also provided (Tables 1, 4). These general recommendations should be used in conjunction with evidence-based guidelines and the physician’s own clinical judgment based on the patient’s glycemic control.31


For patients with diabetes and stage A HF, the cornerstone of therapy is dietary modification and weight reduction. Metformin is also recommended as monotherapy or in conjunction with other agents. DPP-4 inhibitors, GLP-1 agonists, or SGLT2 inhibitors would be reasonable agents to use either as add-ons or as monotherapy, with the latter two especially beneficial in overweight individuals. Insulin therapy can be considered if glycemic control is not achieved with the above therapies. If possible, sulfonylureas and thiazolidinediones (TZDs) should be avoided. Consensus guidelines from the American Diabetes Association and American Heart Association do mention cautious low-dose use of TZDs in patients without symptomatic heart disease but with one or more risk factors for congestive heart failure.11 If TZDs are used at this stage, patients should be carefully monitored for worsening signs/symptoms of HF.


In patients with stage B HF and T2DM, we recommend initiating early therapy with newer agents, beginning with DPP-4 inhibitors. Most of these agents have demonstrated an improved safety profile, including low risk of hypoglycemia and neutral weight effect when compared with traditional diabetic therapy.

An important caution was displayed in one of the earliest large CV trials studying the safety of these agents. In the Saxagliptin Assessment of Vascular Outcomes Recorded in Patients With Diabetes Mellitus–Thrombolysis in Myocardial Infarction 53 (SAVOR-TIMI 53) trial, saxagliptin showed noninferiority regarding a composite of CV death, nonfatal myocardial infarction, or nonfatal ischemic stroke, but it also showed an unexpected early increase of 27% in HF hospitalization.32 In the Examination of Cardiovascular Outcomes with Alogliptin versus Standard of Care (EXAMINE) trial, alogliptin demonstrated noninferiority regarding CV safety in a high-risk patient population but also displayed a nonstatistically significant 19% increase in hospitalization for HF.33 Both studies found a higher proportion of hospitalization for HF events in the top baseline quartile with B-type natriuretic peptide, suggesting a higher susceptibility of patients with underlying significant hemodynamic disturbances. Conversely, another RCT involving DPP-4 inhibitors did not show statistical difference regarding risk of HF hospitalization, which suggests that this is not a class effect.34 Their ease of use and simple dosing regimens make DPP-4 inhibitors an attractive option in the early stages of HF management, with the cautions mentioned above. Early use of SGLT2 inhibitors should also be considered based on robust clinical data (as discussed below).


At this stage, we recommend intensifying therapy by switching from DPP-4 inhibitors to GLP-1 agonists and avoiding the simultaneous use of two incretin-based agents. The injectable drugs have greater potency and have not been associated with adverse HF outcomes.

GLP-1 agonists have become increasingly recognized for their weight loss effect and improvement in glycemic and metabolic profiles, especially in overweight and obese patients. Although initial outcomes comparing lixisenatide and placebo in acute coronary syndrome were no different,35 more recent studies have demonstrated cardioprotective effects. For example, liraglutide showed a decrease in composite death from CV causes, nonfatal myocardial infarction, nonfatal stroke and a nonstatistically decreased rate of hospitalization for HF.36 Also, a recent RCT studying CV outcomes with the newest agent on this class, semaglutide, demonstrated significant decreased rates of CV death, nonfatal myocardial infarction, or nonfatal stroke.37 It is important to consider cost and patient preference, as these agents are injectable with variable dosing frequency (Table 4). 

Table 4a. Newer antihyperglycemic agents, brand name, dosing, and recommended renal adjustments. eGFR: estimated glomerular filtration rate; ESRD: end-stage renal disease; CrCl: Creatinine Clearance; HD: hemodialysis; PD: peritoneal dialysis
Table 4b. Newer antihyperglycemic agents, brand name, dosing, and recommended renal adjustments. eGFR: estimated glomerular filtration rate; ESRD: end-stage renal disease; CrCl: Creatinine Clearance; HD: hemodialysis; PD: peritoneal dialysis

SGLT2 inhibitors are a promising class of antihyperglycemic agents based on their robust beneficial effect on CV risk, including HF. The landmark Empagliflozin Cardiovascular Outcome Event Trial in Type 2 Diabetes Mellitus Patients (EMPA-REG OUTCOME) trial was the first to show a statistically significant decrease in composite risk of death from CV causes, nonfatal myocardial infarction, and risk of HF hospitalization.38 This has created a significant impact on current clinical practices as reflected in the recent clinical guidelines regarding management of T2DM.31


Management of diabetes in advanced HF raises significant challenges. Common antihyperglycemic agents are restricted at this stage due to significant accompanying comorbidities, including renal dysfunction, systemic hypoperfusion, lactic acidosis risk, and other hemodynamic abnormalities. This frequently leaves insulin as the primary therapy,39 despite concerns regarding its impact on HF, as explained above. The judicious use of insulin is advised, and less-strict glycemic goals should be considered, especially in elderly patients.40 Use of SGLT2 inhibitors and GLP-1 agonists could be considered as combined or monotherapy if tolerated, but more studies evaluating their safety in this population are ongoing.


Heart failure is an important and under-recognized complication of T2DM. Multiple studies have shown that patients with T2DM and congestive heart failure have poor outcomes, and basic science studies have revealed pathophysiologic mechanisms that may underlie this relationship. Therefore, it is important to understand and use appropriate T2DM therapies in this population. If appropriate, agents such as metformin, GLP-1 agonists, and SGLT2 inhibitors should be considered in HF patients. Conversely, agents such as TZDs and sulfonylureas should be avoided, if possible. Close monitoring and judicious use of diabetic therapies should be constantly reviewed in HF patients at various stages of their disease. Ultimately, further studies are needed to better guide hyperglycemia management in this population.


  • Type 2 diabetes (T2DM) and heart failure (HF) pathophysiology have a strong relationship, resulting in an increased incidence of HF in patients with T2DM and a significant negative impact on HF outcomes.
  • Several traditional antihyperglycemic agents demonstrated detrimental effects regarding HF outcomes, thus restricting their use and complicating the management of patients with HF and T2DM.
  • Current management options for glycemic control have expanded and include agents that show promise of improved diabetes and cardiovascular outcomes in HF; however, they are often underused due to lack of familiarity by physicians outside of the endocrinology field.
  • We present a stage-based approach to management of type 2 diabetes with HF and suggest early incorporation of newer agents, including DPP-4 inhibitors, GLP-1 agonists, and SGLT2 inhibitors.
Conflict of Interest Disclosure

Dr. Hamilton is a principal investigator in a clinical research trial for Ultragenyx Pharmaceutical, Inc.; Dr. Tabatabai is on the speakers’ bureau for Radius Health and Eli Lilly.


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