Physicians' Academy for Cardiovascular Education

Is the recommended therapy for heart failure with mid-range ejection fraction adequate?

Beta-blockers for heart failure with reduced, mid-range, and preserved ejection fraction: an individual patient-level analysis of double-blind randomized trials

Literature - Cleland JGF, Bunting KV, Flather MD, et al. - Eur Heart J 2018; 39: 26–35

Main results

The figure illustrates the changes in absolute mortality and LVEF in patients with sinus rhythm (beta-blockers vs. placebo), stratified by baseline LVEF.

Conclusion

For HF patients with sinus rhythm and LVEF <40%, beta-blockers improve left ventricular systolic function and reduce CV mortality. Based on the observations in patients with LVEF 40-49%, the authors conclude that they show similar CV mortality and change in LVEF as those with LVEF <40%. These findings suggest that HFmrEF patients might benefit from beta-blocker therapy similarly to HFrEF patients.

Editorial comment

In their editorial article [4], Wilcox and Mann note that the group of patients with an LVEF of 40-49% with increased HF hospitalization and CV death created ‘…consternation, confusion, and intense academic debate…’, because they did not fit into the HFpEF and HFrEF paradigms. The authors explain simply that this group of patients, named HFmrEF, are mainly HFrEF patients whose LVEF has improved due to good clinical management and a smaller group of HFpEF patients whose condition is worsening. Therefore: ‘Given this understanding, the important observation in the report by Cleland and colleagues that beta-blockers decreased cardiovascular mortality in patients with an LVEF of 40–49% is both predictable and reassuring.’ However, based on current guidelines, a HFrEF patient on beta-blockers, whose LVEF has improved and reached 41%, would have been re-classified as a HFmrEF patient, and accordingly, the physician would have to discontinue the beta-blocker therapy. The authors conclude: ‘Hence, the assessment of LVEF is context dependent, and requires prior knowledge about the LVEF trajectory in order to understand patient prognosis fully. While it is premature to comment on whether the study by Cleland et al. will be sufficient to prompt a change in practice guidelines for the management of HFmrEF, this study does highlight the limitations of classifying HF based on LVEF alone and emphasizes the need for more detailed phenotyping in order to individualize targeted medical therapies to improve clinical outcomes in HF.’

References

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