Research Spotlight

Dacy, N., K. Oney, K. Fiala and P. Parekh (2021). “Eosinophilic annular erythema.” Proc (Bayl Univ Med Cent) 34(5): 606-607.

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Eosinophilic annular erythema (EAE) is a rare eosinophilic dermatosis characterized by annular, erythematous papules and plaques commonly found on the trunk and the extremities. There is continued debate on whether EAE is a distinct entity or a clinical polymorphism of Well’s syndrome, but it is generally considered a separate entity based on clinical and histopathological differences. We present a case of EAE and discuss the histopathological findings.

Pocock, S. J., J. P. Ferreira, J. Gregson, S. D. Anker, J. Butler, G. Filippatos, N. D. Gollop, T. Iwata, M. Brueckmann, J. L. Januzzi, A. A. Voors, F. Zannad and M. Packer (2021). “Novel biomarker-driven prognostic models to predict morbidity and mortality in chronic heart failure: the EMPEROR-Reduced trial.” Eur Heart J Aug 23;ehab579. [Epub ahead of print].

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AIMS: The aim of this study was to generate a biomarker-driven prognostic tool for patients with chronic HFrEF. Circulating levels of N-terminal pro B-type natriuretic peptide (NT-proBNP) and high-sensitivity cardiac troponin T (hs-cTnT) each have a marked positive relationship with adverse outcomes in heart failure with reduced ejection fraction (HFrEF). A risk model incorporating biomarkers and clinical variables has not been validated in contemporary heart failure (HF) trials. METHODS AND RESULTS: In EMPEROR-Reduced, 33 candidate variables were pre-selected. Multivariable Cox regression models were developed using stepwise selection for: (i) the primary composite outcome of HF hospitalization or cardiovascular death, (ii) all-cause death, and (iii) cardiovascular mortality. A total of 3730 patients were followed up for a median of 16 months, 823 (22%) patients had a primary outcome and 515 (14%) patients died, of whom 389 (10%) died from a cardiovascular cause. NT-proBNP and hs-cTnT were the dominant predictors of the primary outcome, and in addition, a shorter time since last HF hospitalization, longer time since HF diagnosis, lower systolic blood pressure, New York Heart Association (NYHA) Class III or IV, higher heart rate and peripheral oedema were key predictors (eight variables in total, all P < 0.001). The primary outcome risk score discriminated well (c-statistic = 0.73), with patients in the top 10th of risk having an event rate >9 times higher than those in the bottom 10th. Empagliflozin benefitted patients across risk levels for the primary outcome. NT-proBNP and hs-cTnT were also the dominant predictors of all-cause and cardiovascular mortality, followed by NYHA Class III or IV and ischaemic aetiology (four variables in total, all P < 0.001). The mortality risk model presented good event discrimination for all-cause and cardiovascular mortality (c-statistic = 0.69 for both). These simple models were externally validated in the BIOSTAT-CHF study, achieving similar c-statistics. CONCLUSIONS: The combination of NT-proBNP and hs-cTnT with a small number of readily available clinical variables provides prognostic assessment for patients with HFrEF. This predictive tool kit can be easily implemented for routine clinical use.

Packer, M., J. Butler, F. Zannad, G. Filippatos, J. P. Ferreira, S. J. Pocock, P. Carson, I. Anand, W. Doehner, M. Haass, M. Komajda, A. Miller, S. Pehrson, J. R. Teerlink, S. Schnaidt, C. Zeller, J. M. Schnee and S. D. Anker (2021). “Effect of Empagliflozin on Worsening Heart Failure Events in Patients with Heart Failure and a Preserved Ejection Fraction: The EMPEROR-Preserved Trial.” Circulation.

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Background: Empagliflozin reduces the risk of cardiovascular death or hospitalization for heart failure in patients with heart failure and a preserved ejection fraction, but additional data are needed about its effect on inpatient and outpatient heart failure events. Methods: We randomly assigned 5988 patients with class II-IV heart failure with an ejection fraction of >40% to double-blind treatment with placebo or empagliflozin (10 mg once daily), in addition to usual therapy, for a median of 26 months. We prospectively collected information on inpatient and outpatient events reflecting worsening heart failure and prespecified their analysis in individual and composite endpoints. Results: Empagliflozin reduced the combined risk of cardiovascular death, hospitalization for heart failure or an emergent/urgent heart failure visit requiring intravenous treatment (432 vs 546 patients; empagliflozin vs placebo, respectively; hazard ratio 0.77, 95% CI: 0.67-0.87), P <0.0001. This benefit reached statistical significance at 18 days after randomization. Empagliflozin reduced the total number of heart failure hospitalizations that required intensive care (hazard ratio 0.71, 95% CI 0.52-0.96, P=0.028) and the total number of all hospitalizations that required a vasopressor or positive inotropic drug (hazard ratio 0.73, 95% CI: 0.55-0.97,P=0.033). As compared with placebo, fewer patients in the empagliflozin group reported outpatient intensification of diuretics (482 vs 610, hazard ratio 0.76, 95% CI: 0.67-0.86, P<0.0001), and patients assigned to empagliflozin were 20-50% more likely to have a better NYHA functional class, with significant effects at 12 weeks that were maintained for at least 2 years. The benefit on total heart failure hospitalizations was similar in patients with an ejection fraction of >40-<50% and 50-<60%, but was attenuated at higher ejection fractions. Conclusions: In patients with heart failure and a preserved ejection fraction, empagliflozin produced a meaningful, early and sustained reduction in the risk and severity of a broad range of inpatient and outpatient worsening heart failure events. Clinical Trial Registration: The registration identifier at ClinicalTrials.gov is NCT03057977.

Packer, M. (2021). “Differential Pathophysiological Mechanisms in Heart Failure With a Reduced or Preserved Ejection Fraction in Diabetes.” JACC Heart Fail 9(8): 535-549.

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Diabetes promotes the development of both heart failure with a reduced ejection fraction and heart failure with a preserved ejection fraction through diverse mechanisms, which are likely mediated through hyperinsulinemia rather than hyperglycemia. Diabetes promotes nutrient surplus signaling (through Akt and mammalian target of rapamycin complex 1) and inhibits nutrient deprivation signaling (through sirtuin-1 and its downstream effectors); this suppresses autophagy and promotes endoplasmic reticulum and oxidative stress and mitochondrial dysfunction, thereby undermining the health of diabetic cardiomyocytes. The hyperinsulinemia of diabetes may also activate sodium-hydrogen exchangers in cardiomyocytes (leading to injury and loss) and in the proximal renal tubules (leading to sodium retention). Diabetes may cause epicardial adipose tissue expansion, and the resulting secretion of proinflammatory adipocytokines onto the adjoining myocardium can lead to coronary microcirculatory dysfunction and myocardial inflammation and fibrosis. Interestingly, sodium-glucose cotransporter 2 (SGLT2) inhibitors-the only class of antidiabetic medication that reduces serious heart failure events-may act to mitigate each of these mechanisms. SGLT2 inhibitors up-regulate sirtuin-1 and its downstream effectors and autophagic flux, thus explaining the actions of these drugs to reduce oxidative stress, normalize mitochondrial structure and function, and mute proinflammatory pathways in the stressed myocardium. Inhibition of SGLT2 may also lead to a reduction in the activity of sodium-hydrogen exchangers in the kidney (leading to diuresis) and in the heart (attenuating the development of cardiac hypertrophy and systolic dysfunction). Finally, SGLT2 inhibitors reduce the mass and mute the adverse biology of epicardial adipose tissue (and reduce the secretion of leptin), thus explaining the capacity of these drugs to mitigate myocardial inflammation, microcirculatory dysfunction, and fibrosis, and improve ventricular filling dynamics. The pathophysiological mechanisms by which SGLT2 inhibitors may benefit heart failure likely differ depending on ejection fraction, but each represents interference with distinct pathways by which hyperinsulinemia may adversely affect cardiac structure and function.

Gori, M., M. Senni, B. Claggett, J. Liu, A. P. Maggioni, M. Zile, M. F. Prescott, D. J. Van Veldhuisen, F. Zannad, B. Pieske, C. S. P. Lam, J. Rouleau, P. Jhund, M. Packer, M. A. Pfeffer, M. Lefkowitz, V. Shi, J. J. V. McMurray and S. D. Solomon (2021). “Integrating High-Sensitivity Troponin T and Sacubitril/Valsartan Treatment in HFpEF: The PARAGON-HF Trial.” JACC Heart Fail 9(9): 627-635.

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OBJECTIVES: This study examined the relationship among high-sensitivity troponin-T (hs-TnT), outcomes, and treatment with sacubitril/valsartan in patients with heart failure (HF) and preserved ejection fraction (HFpEF). BACKGROUND: hs-TnT is a marker of myocardial injury in HF. METHODS: The PARAGON-HF trial randomized 4,796 patients with HFpEF to sacubitril/valsartan or valsartan. We compared the risk of the composite outcome of cardiovascular death (CVD) and total HF hospitalization (HHF) according to hs-TnT. We also assessed the effect of allocated treatment on hs-TnT. RESULTS: hs-TnT was available in 1,141 patients (24%) at run-in (median value: 17 ng/L) and 1,260 (26%) at randomization, with 58.3% having hs-TnT >14 ng/L (upper limit of normal). During a median follow-up of 34 months, there were 393 outcome events (82 CVD, 311 HHF). Adjusting for demographics, comorbidities, left ventricular ejection fraction (LVEF), and N-terminal pro B-type natriuretic peptide (NT-proBNP), log-hs-TnT at randomization was an independent predictor of the composite outcome (HR: 1.38; 95% CI: 1.19-1.59; P < 0.001). Compared with valsartan, sacubitril/valsartan significantly reduced hs-TnT by 9% at week 16 (P < 0.001). Patients whose hs-TnT decreased from randomization to 16 weeks to at or below the median value of 17 ng/L subsequently had a lower risk of CVD/HHF compared with those with persistently elevated hs-TnT (P = 0.046). Patients with higher baseline hs-TnT (>17 ng/L) appeared to have a greater benefit from sacubitril/valsartan treatment when accounting for other potential effect modifiers (P interaction = 0.07). CONCLUSIONS: Higher baseline hs-TnT was associated with increased risk of CVD/HHF, whereas hs-TnT decrease at 16 weeks led to lower subsequent risk of CVD/HHF compared with those who had persistently elevated values. Sacubitril/valsartan significantly reduced hs-TnT compared with valsartan. hs-TnT may be helpful in identifying patients with HFpEF who are more likely to benefit from sacubitril/valsartan.