Ejection fraction to classify heart failure: are we using the right thing?
European Heart Journal, Volume 41, Issue 12, 21 March 2020, Pages 1219–1222, https://doi.org/10.1093/eurheartj/ehaa205
Published:
21 March 2020
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Initially, heart failure was a condition with reduced ejection fraction—HFrEF.1 Later on it was noted that patients with near normal or normal ejection fraction could also present with symptoms of heart failure, a condition labelled as heart failure with preserved ejection fraction or HFpEF,2 which remains an enigma and a challenge for clinicians. The current focus issue on heart failure starts with ‘The year in cardiology: heart failure’ by John Cleland from the Imperial College and Glasgow University in the UK, and colleagues. The authors note that 2019 brought many new concepts and an abundance of new data on the nature, management, and outcome of HFrEF and HFpEF. The importance of these novel findings reviewed in this article is further supported by the fact that the outcome of cardiovascular disease is determined to a large extent by the ability to delay or prevent the development of heart failure.3 Accordingly, attention is shifting to earlier diagnosis of and intervention for heart failure. Patients with type-2 diabetes mellitus4 or coronary artery disease5 have a relatively good prognosis unless plasma concentrations of natriuretic peptides are increased, reflecting cardiac or renal dysfunction. Adoption of a simple ‘Universal Definition’ of heart failure based on natriuretic peptides would facilitate early diagnosis and treatment,6 but will lead to an enormous increase in its prevalence.
The 2016 ESC Guidelines have defined three categories of heart failure based on left ventricular ejection fraction (LVEF7). However, the evidence for this is lacking, in particular for the limits currently defined.1 It continues to remain a matter of debate where the sweet spot of LVEF lies. This has been properly addressed in the FAST TRACK ‘Routinely reported ejection fraction and mortality in clinical practice: where does the nadir of risk lie?’ by Brandon Fornwalt and colleagues from Geisinger in Danville, Pennsylvania, USA.8 Physician-reported LVEF on 403 977 echocardiograms from 203 135 patients were linked to all-cause mortality using electronic health records. A data set of 45 531 echocardiograms and 35 976 patients from New Zealand provided independent validation. Overall, adjusted hazard ratios (HRs) for mortality showed a U-shaped relationship for LVEF, with a nadir of risk at 60–65%, a HR of 1.71 with ≥70% and a HR of 1.73 in the range of 35–40% (Figure 1). Similar relationships with a nadir at 60–65% were observed in the validation data set as well as for each age group and both sexes, and after adjustments for conditions associated with an elevated LVEF, including mitral regurgitation, increased wall thickness, and anaemia. Thus, deviation of LVEF from 60–65% is associated with an increase in mortality regardless of age, sex, or other relevant comorbidities such as heart failure. These data will stimulate debate about the definition of a normal LVEF as well as the possible recognition of phenotypes characterized by supranormal LVEF, as outlined in an Editorial by Jeroen Bax from the Leiden University Medical Center in the Netherlands.9 We may have to rethink whether LVEF is really a useful main criterion to characterize patients with heart failure.
Figure 1
This becomes even more obvious in specific forms of HFpEF. Cardiac amyloidosis is more common than previously thought10 and typically manifests as HFpEF due to extracellular plaques of aggregated transthyretin or TTR, and is associated with a poor prognosis.11 Despite recent success in halting disease progression with a TTR stabilizer and encouraging preliminary findings with TTR silencers,12 these agents are not targeting pre-existing plaques, but rather just delay or prevent the formation of new plaques, explaining their delayed onset of action in trials.13 In their manuscript entitled ‘A novel monoclonal antibody targeting aggregated transthyretin facilitates its removal and functional recovery in an experimental model’, Jacob George and colleagues from the Kaplan Medical Center in Rehovot, Israel examined a novel IgG1 monoclonal antibody against aggregated TTR in experimental cardiac amyloidosis.14 The antibody immunoprecipitates TTR in the sera of patients with wild-type ATTR and stains cardiac plaques. Furthermore, the antibody facilitates aggregated TTR uptake by myeloid cells and protects cardiomyocytes from TTR-inducible toxicity. In a novel in vivo model of wild-type ATTR amyloidosis, the antibody enhanced the disappearance of pyrophosphate signals, attesting to a rapid amyloid deposit removal and degradation, and also improved echocardiographic measures of cardiac performance. Importantly, a capture enzyme-linked immunosorbent assay (ELISA) developed based on the antibody exhibited higher levels of aggregated TTR in the sera of wild-type ATTR amyloidosis patients as compared with those with heart failure, suggesting a potential applicability in diagnosis and pharmacodynamic guidance of dosing. Thus, the antibody targeting aggregated TTR exhibits beneficial effects in a novel experimental wild-type ATTR and possesses a potential diagnostic utility. Whether this novel antibody could potentially be used as a disease-modifying agent in ATTR amyloidosis is further discussed in a balanced Editorial by Rodney Howard Falk from the Harvard University School of Medicine in Boston, Massachusetts, USA.15
Right ventricular dysfunction is an important determinant of functional status leading to tricuspid regurgitation16,17 and impaired survival in various diseases states.18 However, little is known about its epidemiology and the outcome of patients with severe right ventricular dysfunction. In their article entitled ‘Aetiology and outcomes of severe right ventricular dysfunction’, Ratnasari Padang and colleagues from the Mayo Clinic Minnesota in Rochester, Minnesota, USA examined this issue.19 In 64 728 patients undergoing echocardiography, mild or more severe right ventricular dysfunction occurred in 21%. This study focused on the 1299 or 4% of patients with severe right ventricular dysfunction. The most common causes were left-sided heart diseases in 46%, pulmonary thrombo-embolic disease in 18%, chronic lung disease or hypoxia in 17%, and pulmonary arterial hypertension in 11%. After a mean of 2 years of follow-up (Figure 2), 701 deaths occurred, two-thirds within the first year of diagnosis. The overall probability of survival at 1 and 5 years for the entire cohort was 61% and 35%, respectively. In left heart disease, 1- and 5-year survival rates were 61% and 33%, respectively. In pulmonary arterial hypertension, the corresponding values were 76% and 50%, in thrombo-embolic diseases 71% and 49%, and in chronic lung disease 42% and 8%, respectively. Importantly, moderate to severe tricuspid regurgitation portended worse survival. Thus, 1-year mortality of patients with severe right ventricular dysfunction is high and dependent on the underlying cause, with left heart disease being the most common and prognosis being worst in chronic lung disease. These clinically highly important findings are put into context in an Editorial by Marco Guazzi from the Cardiopulmonary Laboratory of the Cardiology Division at the University of Milano in Italy.20
Figure 2
Traditionally, clinicians measure LVEF and at best left ventricular and pulmonary pressures in the evaluation of heart failure. However, ventricular pressure–volume analysis is the reference method for the study of cardiac mechanics, as pointed out by Nicolas Van Mieghem and colleagues from the Thoraxcenter, Erasmus MC, in Rotterdam, the Netherlands in their review entitled ‘Invasive left ventricle pressure–volume analysis: overview and practical clinical implications’. Indeed, advances in calibration algorithms and measuring techniques brought new perspectives for its application in different research and clinical settings. Simultaneous pressure–volume measurement in the heart chambers offers unique insights into mechanical cardiac efficiency. Beat to beat invasive pressure–volume monitoring can be instrumental in the understanding and management of heart failure, valvular heart disease, and mechanical cardiac support.21
The last article is based on the Geoffrey Rose lecture given at the European Society of Cardiology meeting held in conjunction with the World Congress of Cardiology, in Paris, in 2019 entitled ‘Heart failure can affect everyone: the ESC Geoffrey Rose lecture’ by Karen Sliwa from the University of Cape Town in South Africa.22 In her lecture, she applies the concept of ‘sick individuals versus sick population’ pioneered by Geoffrey Rose 35 years ago to heart failure. Indeed, heart failure not only affects a large spectrum of the population globally,23 but it occurs in all ages and equally in both genders.24 Heart failure, in most parts of the world, is clearly not a disease of the elderly.25 There are multiple and complex pathways leading to heart failure which include various risk factors including communicable diseases and exposure to indoor and environmental pollutants, poverty, and overcrowding, as well as suboptimal access to healthcare systems due to socio-economic inequities.
The issue is further complemented by a Discussion Forum contribution. In a contribution ‘How much can acute heart failure patients with low basic blood pressure (systolic blood pressure 90–100 mmHg) benefit from the use of vasodilators?’ Ying Zhou and colleagues from the First Affiliated Hospital of Nanchang University in Nanchang, China comment on the contribution entitled ‘2016 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure: the Task Force for the diagnosis and treatment of acute and chronic heart failure of the European Society of Cardiology (ESC). Developed with the special contribution of the Heart Failure Association’ by Piotr Ponikowski from the Clinical Military Hospital in Wroclaw, Poland.7,26
The editors hope that this issue of the European Heart Journal will be of interest to its readers.
With thanks to Amelia Meier-Batschelet for help with compilation of this article.
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