Decline in Estimated Glomerular Filtration Rate After Dapagliflozin in Heart Failure With Mildly Reduced or Preserved Ejection Fraction: A Prespecified Secondary Analysis of the DELIVER Randomized Clinical Trial

Albuminuria as a diagnostic criterion and a therapeutic target in heart failure and other cardiovascular disease

The high disease burden and bidirectional relationship of chronic kidney disease (CKD), heart failure (HF) and other cardiovascular disease (CVD) necessitate the need for early diagnosis of these diseases. While current screening and detection methods are recommended by CKD and CVD guidelines, their adoption in practice is low. Urine albumin-to-creatinine ratio (uACR) is recognized as a diagnostic marker for CKD and a prognostic marker for CKD progression, HF and CVD outcomes, therefore albuminuria changes have been accepted as a surrogate outcome for kidney and cardiovascular endpoints. Furthermore, clinical trials investigating guideline-directed medical therapies have shown that uACR reductions are accompanied by risk reductions for cardiovascular, HF and other CKD outcomes. However, uACR is not routinely measured in patients at risk of kidney and heart disease, and its utility for detection, risk stratification and prediction models may not be fully appreciated in routine clinical practice. This review will discuss the effectiveness and implications of uACR screening as a method for heart and kidney disease diagnosis and risk assessment.

The interplay between heart failure and chronic kidney disease

Chronic kidney disease (CKD) and heart failure (HF) are two globally prevalent, independent, long-term conditions, which often coexist in an individual and display a bidirectional yet interconnected relationship. The presence of CKD often leads to the development of HF and vice versa, which propagates the worsening of each disease, reflecting an intertwined disease cycle. Both HF and CKD share common risk factors, such as increasing age, diabetes, high blood pressure, obesity and smoking. Data show that approximately half of all people with HF also have CKD, which impacts patient burden and quality of life due to a significantly greater risk of hospitalization and death, compared with those that have either CKD or HF. To maximize treatment effectiveness in individuals with both HF and CKD, healthcare professionals should recognize that these two diseases are systemic conditions, representing organ-specific manifestations of similar underlying processes. It is also essential to understand the role of renin-angiotensin system inhibitors, sodium-glucose cotransporter 2 inhibitors, the nonsteroidal mineralocorticoid receptor antagonist finerenone, and glucagon-like peptide-1 receptor agonists in managing these conditions. Lifestyle modifications should also be recommended. This review discusses factors contributing to the interplay between HF and CKD and the key role of healthcare professionals in providing appropriate treatment for the co-existing diseases.

Effect of Initial eGFR and Albuminuria Changes on Clinical Outcomes in People With Diabetes Receiving SGLT2 Inhibitors

CONTEXT

The relationship between initial changes in estimated glomerular filtration rate (eGFR) and urine albumin to creatinine ratio (UACR), and their independent association with clinical outcomes in type 2 diabetes (T2D) patients receiving sodium-glucose cotransporter 2 inhibitors (SGLT2is), remains unclear.

OBJECTIVE

This study aimed to investigate the association between initial changes in eGFR and UACR with consequent cardiovascular and kidney outcomes in an Asian population with T2D following SGLT2i treatment in a real-world setting.

METHODS

Using a large multicenter medical database in Taiwan, we analyzed 8222 T2D patients with baseline and 3-month follow-up eGFR and UACR measurements, receiving SGLT2is between June 1, 2016, and December 31, 2021. We assessed risks of major adverse renal events (MARE), major adverse cardiovascular events (MACE), hospitalization for heart failure (HHF), and all-cause mortality using a Cox proportional hazards model.

RESULTS

After 3 months of SGLT2i treatment, patients were categorized based on early changes in eGFR (no decline, 0%-10% decline, > 10% decline) and UACR (no reduction, 0%-30% reduction, > 30% reduction). Among those with no initial eGFR decline (40.9%), 19.8% had no initial UACR reduction, 8.4% had 0% to 30% reduction, and 12.7% had greater than 30% reduction. For those with greater than 10% initial eGFR decline (21.5%), 6.5% had no UACR reduction, 4.3% had 0% to 30% reduction, and 10.7% had greater than 30% reduction. Patients with greater than 10% initial eGFR decline but no UACR reduction showed higher risks of MARE (adjusted HR [aHR]: 2.34; 95% CI, 1.32-4.15), MACE (aHR: 1.83; 95% CI, 1.01-3.29), and HHF/cardiovascular death (aHR: 1.93; 95% CI, 1.05-3.55) compared to those with modest early eGFR decline and UACR reduction.

CONCLUSION

T2D patients experiencing profound early eGFR decline without concordant UACR reduction while on SGLT2is represent a high-risk subgroup with worse clinical outcomes. These findings suggest the need for closer monitoring and potentially more aggressive therapeutic strategies for this patient population.

Efficacy and safety of SGLT2 inhibitors in patients with heart failure according to kidney function: a systematic review and meta-analysis

INTRODUCTION AND OBJECTIVES

This study aimed to evaluate the efficacy and safety of sodium-glucose cotransporter 2 (SGLT2) inhibitors throughout the spectrum of kidney function in patients with heart failure (HF).

METHODS

This meta-analysis included randomized controlled trials comparing SGLT2 inhibitors with placebo in patients with HF stratified by renal function. Literature from inception to June 8, 2024 was searched. The primary outcome was a composite of cardiovascular death or HF events.

RESULTS

Five trials were identified, comprising 21 204 patients (10 605 in the SGLT2 inhibitor group and 10 599 in the placebo group) who were randomized and followed up for a weighted median duration of 1.8 years. When patients were classified by estimated glomerular filtration rate (eGFR) of 60mL/min/1.73 m2, SGLT2 inhibitors reduced the risk of the primary outcome irrespective of kidney function (RR, 0.81; 95%CI, 0.75-0.87; P<.01 for eGFR <60mL/min/1.73 m2; RR, 0.79; 95%CI, 0.72-0.87; P<.01 for eGFR≥ 60mL/min/1.73 m2; test for subgroup differences P=.75). The beneficial impact of SGLT2 inhibitors was consistently observed when patients were further subclassified by eGFR values of 20-30, 30-45, 45-60, and >60mL/min/1.73 m2 (test for subgroup differences, P=.54). Early eGFR decline showed a differential impact with increased risk only in the placebo subgroup (RR, 1.30; 95%CI, 1.15-1.47; P<.01), but not in the SGLT2 inhibitor subgroup (RR, 0.99; 95%CI, 0.86-1.13; P=.84) (test for subgroup differences, P<.01).

CONCLUSIONS

SGLT2 inhibitor therapy is safe and effective throughout the spectrum of kidney function and regardless of the initial decline in kidney function in patients with chronic HF. Registered at PROSPERO: CRD42024565218.

Initial Decline in Glomerular Filtration Rate With Finerenone in HFmrEF/HFpEF: A Prespecified Analysis of FINEARTS-HF

BACKGROUND

An initial decline in estimated glomerular filtration rate (eGFR) often leads to reluctance to continue life-saving therapies in patients with heart failure (HF).

OBJECTIVES

The goal of this study was to describe the association between initial decline in eGFR and subsequent clinical outcomes in patients randomized to placebo or finerenone.

METHODS

In this prespecified analysis of FINEARTS-HF (Finerenone Trial to Investigate Efficacy and Safety Superior to Placebo in Patients with Heart Failure), we examined the association between initial decline in eGFR (≥15%) from randomization to 1 month and subsequent outcomes in patients assigned to finerenone or placebo. The primary outcome was the composite of total HF events and cardiovascular death.

RESULTS

Among 5,587 patients with an eGFR measurement at both baseline and 1 month, 1,018 (18.2%) experienced a ≥15% decline in eGFR. The proportion of patients experiencing a ≥15% decline in eGFR was 23.0% with finerenone and 13.4% with placebo (OR: 1.95; 95% CI: 1.69-2.24; P < 0.001). After adjustment, an eGFR decline was associated with a higher risk of the primary outcome in patients assigned to placebo (adjusted rate ratio: 1.50; 95% CI: 1.20-1.89) but not in those assigned to finerenone (adjusted rate ratio: 1.07; 95% CI: 0.84-1.35; Pinteraction = 0.04). By contrast, the efficacy of finerenone was consistent across the range of change in eGFR from baseline to 1 month (Pinteraction = 0.50 for percent change in eGFR), and safety, including hyperkalemia, was similar regardless of an early eGFR decline.

CONCLUSIONS

Although an initial decline in eGFR was associated with worse outcomes in patients assigned to placebo, this relationship was not as strong in those treated with finerenone. An early decline in eGFR can be anticipated with finerenone and should not automatically lead to the discontinuation of this disease-modifying therapy (FINEARTS-HF Finerenone Trial to Investigate Efficacy and Safety Superior to Placebo in Patients with Heart Failure [NCT04435626]; A Multicenter, Randomized, Double-Bline, Parallel-Group, Placebo-Controlled Study to Evaluate the efficacy and safety of finerenone on morbidity and mortality in participants With Heart Failure [NYHA II-IV] and left ventricular ejection fraction ≥40% [EudraCT 2020-000306-29]).

Cardiorenal Disease and Heart Failure with Preserved Ejection Fraction: Two Sides of the Same Coin

BACKGROUND

Heart failure with preserved ejection fraction (HFpEF) and chronic kidney disease (CKD) have a strong pathophysiological interrelationship, and their combination worsens prognosis.

SUMMARY

This article briefly reviews the bidirectional epidemiological burden and the pathophysiological interplay between HFpEF and CKD. It also discusses some of the controversial aspects regarding the diagnosis and screening of HFpEF in CKD patients and focuses on the most effective therapeutic approaches to improve symptoms and prognosis in this high-risk population.

KEY MESSAGES

Due to its prevalence and prognostic significance, HFpEF screening should be considered in patients with CKD, with careful use of traditional diagnostic tools in this population. Optimal medical therapy has seen major recent advances in patients with both HFpEF and CKD. SGLT2 inhibitors, finerenone, and semaglutide have consistently demonstrated cardio- and renoprotective effects in both conditions.

Leveraging metabolism for better outcomes in heart failure

Whilst metabolic inflexibility and substrate constraint have been observed in heart failure for many years, their exact causal role remains controversial. In parallel, many of our fundamental assumptions about cardiac fuel use are now being challenged like never before. For example, the emergence of sodium-glucose cotransporter 2 inhibitor therapy as one of the four 'pillars' of heart failure therapy is causing a revisit of metabolism as a key mechanism and therapeutic target in heart failure. Improvements in the field of cardiac metabolomics will lead to a far more granular understanding of the mechanisms underpinning normal and abnormal human cardiac fuel use, an appreciation of drug action, and novel therapeutic strategies. Technological advances and expanding biorepositories offer exciting opportunities to elucidate the novel aspects of these metabolic mechanisms. Methodologic advances include comprehensive and accurate substrate quantitation such as metabolomics and stable-isotope fluxomics, improved access to arterio-venous blood samples across the heart to determine fuel consumption and energy conversion, high quality cardiac tissue biopsies, biochemical analytics, and informatics. Pairing these technologies with recent discoveries in epigenetic regulation, mitochondrial dynamics, and organ-microbiome metabolic crosstalk will garner critical mechanistic insights in heart failure. In this state-of-the-art review, we focus on new metabolic insights, with an eye on emerging metabolic strategies for heart failure. Our synthesis of the field will be valuable for a diverse audience with an interest in cardiac metabolism.

Contemporary treatment options in heart failure with preserved ejection fraction

Heart failure with preserved ejection fraction (HFpEF) constitutes approximately half of the heart failure population, with its prevalence markedly increasing with older age and the presence of cardio-metabolic comorbidities. Although HFpEF is associated with a high symptom- and mortality burden, historically there have been few evidence-based treatment options for patients with HFpEF. Recent randomized clinical trials have expanded evidence on pharmacological treatment options, introducing new agents for managing HFpEF. Given the complex clinical phenotype with pathophysiological heterogeneity and evolving diagnostic standards, the evidence-based management of HFpEF remains challenging for clinicians. This review summarizes the latest evidence from contemporary randomized clinical trials and recent guideline recommendations to provide guidance for the treatment of patients with HFpEF.

Sodium-Glucose Cotransporter-2 Inhibitors in Diabetic Patients with Heart Failure: An Update

Diabetes mellitus and heart failure are two diseases that are commonly found together, in particular in older patients. High blood glucose has a detrimental effect on the cardiovascular system, and worse glycemic control contributes to the onset and the recrudesce of heart failure. Therefore, any specific treatment aimed to reduce glycated hemoglobin may, in turn, have a beneficial effect on heart failure. Sodium-glucose cotransporter-2 inhibitors have been initially developed for the treatment of type 2 diabetes mellitus, and their significant action is to increase glycosuria, which in turn causes a reduction in glucose blood level and contributes to the reduction of cardiovascular risk. However, recent clinical trials have progressively demonstrated that the glycosuric effect of the sodium-glucose cotransporter-2 inhibitors also have a diuretic effect, which is a crucial target in the management of patients with heart failure. Additional studies also documented that sodium-glucose cotransporter-2 inhibitors improve the therapeutical management of heart failure, independently by the glycemic control and, therefore, by the presence of diabetes mellitus. In this review, we analyzed studies and trials demonstrating the efficacy of sodium-glucose cotransporter-2 inhibitors in treating chronic and acute heart failure.

Heart Failure with Mildly Reduced Ejection Fraction-A Phenotype Waiting to Be Explored

Heart failure (HF) presents a significant global health challenge recognised by frequent hospitalisation and high mortality rates. The assessment of left ventricular (LV) ejection fraction (EF) plays a crucial role in diagnosing and predicting outcomes in HF, leading to its classification into preserved (HFpEF), reduced (HFrEF), and mildly reduced (HFmrEF) EF. HFmrEF shares features of both HFrEF and HFpEF but also exhibits distinct characteristics. Despite advancements, managing HFmrEF remains challenging due to its diverse presentation. Large-scale studies are needed to identify the predictors of clinical outcomes and treatment responses. Utilising biomarkers for phenotyping holds the potential for discovering new treatment targets. Given the uncertainty surrounding optimal management, individualised approaches are imperative for HFmrEF patients. This chapter examines HFmrEF, discusses the rationale for its re-classification, and elucidates HFmrEF's key attributes. Furthermore, it provides a comprehensive review of current treatment strategies for HFmrEF patients.

Application of the European Kidney Function Consortium Equation to Estimate Glomerular Filtration Rate: A Comparison Study of the CKiD and CKD-EPI Equations Using the Korea National Health and Nutrition Examination Survey (KNHANES 2008-2021)

Background and Objectives: The European Kidney Function Consortium (EKFC) equation has been newly proposed for estimating glomerular filtration rate (eGFR) across the spectrum of age. We compared the EKFC equation with the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations in a large-scale Korean population. Materials and Methods: Using the representative Korean health examination data, the Korea National Health and Nutrition Examination Survey (KNHANES 2008-2021), the records of 91,928 subjects (including 9917 children) were analyzed. We compared the EKFC equation with CKiD, CKD-EPI 2009, and CKD-EPI 2021 equations and investigated their agreement across GFR categories. Results: In the total population, the CKD-EPI 2021 equation yielded the highest eGFR value, followed by the CKD-EPI 2009 and EKFC equations. In children, the distribution of eGFR differed significantly between the EKFC and CKiD equations (p < 0.001), with a wider range of eGFR values found with the CKiD equation. Each equation showed weak or moderate agreement on the frequency of the GFR category (κ = 0.54 between EKFC and CKD-EPI 2021; κ = 0.77 between EKFC and CKD-EPI 2009). The eGFR values found by the EKFC equation showed high or very high correlations with those by the CKiD, CKD-EPI 2009, and CKD-EPI 2021 equations (r = 0.85, 0.97, and 0.97, respectively). As eGFR values increased, bigger differences were observed between equations. Conclusions: This large-scale study demonstrates that the EKFC equation would be applicable across the entire age spectrum in Asian populations. It also underscores that national kidney health would be highly affected by an eGFR equation being implemented. Additional investigation and more caution would be warranted for the transition of eGFR equations.