Early and comprehensive care bundle in elderly for acute heart failure in the emergency department: study protocol of The ELISABETH stepped wedge cluster randomized trial

Background: Acute heart failure (AHF) is one of the most common diagnoses for elderly patients in the emergency department (ED), with an admission rate higher than 80% and 1-month mortality around 10%. The European guidelines for the management of AHF are based on moderate levels of evidence, due to the lack of randomized controlled trials and the scarce evidence of any clinical added value of a specific treatment to improve outcomes. Recent reports suggest that the very early administration of full recommended therapy may decrease mortality. However, several studies highlighted that elderly patients often received suboptimal treatment. Our hypothesis is that an early care bundle that comprises early and comprehensive management of symptoms, along with prompt detection and treatment of precipitating factors should improve AHF outcome in elderly patients. Method/design: ELISABETH is a stepped-wedge, controlled cluster randomized, clinical trial in 15 emergency departments in France recruiting all patients aged 75 years and older with a diagnosis of AHF. The tested intervention is a care bundle with a checklist that mandates detection and early treatment of AHF precipitating factors, early and intensive treatment of congestion with intravenous nitrates boluses, and application of other recommended treatment (low dose diuretics, non-invasive ventilation when indicated, and preventive low molecular weight heparin). Each centre are randomized to the order in which they will switch from “control period” to “intervention period”. All centers begin the trials with the control period for two weeks, then after each two-weeks step a new centre will be in the intervention period. At the end of the trial, all clusters will receive the intervention regimen. The primary outcome is the number of days alive and out of the hospital at 30 days. Discussion: If our hypothesis is confirmed, this trial will strengthen the level of evidence of AHF guidelines and stress the importance of the associated early and comprehensive treatment of precipitating factors. This trial could be the first to report a reduction in short term morbidity and mortality in elderly AHF patients. Registration: NCT03683212, prospectively registered on September 25th 2018 Keywords: Elderly, acute heart failure, emergency department