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<jats:sec id="abs1-1"> <jats:title>Background</jats:title> <jats:p>Adrenaline has been used as a treatment for cardiac arrest for many years, despite uncertainty about its effects on long-term outcomes and concerns that it may cause worse neurological outcomes.</jats:p> </jats:sec> <jats:sec id="abs1-2"> <jats:title>Objectives</jats:title> <jats:p>The objectives were to evaluate the effects of adrenaline on survival and neurological outcomes, and to assess the cost-effectiveness of adrenaline use.</jats:p> </jats:sec> <jats:sec id="abs1-3"> <jats:title>Design</jats:title> <jats:p>This was a pragmatic, randomised, allocation-concealed, placebo-controlled, parallel-group superiority trial and economic evaluation. Costs are expressed in Great British pounds and reported in 2016/17 prices.</jats:p> </jats:sec> <jats:sec id="abs1-4"> <jats:title>Setting</jats:title> <jats:p>This trial was set in five NHS ambulance services in England and Wales.</jats:p> </jats:sec> <jats:sec id="abs1-5"> <jats:title>Participants</jats:title> <jats:p>Adults treated for an out-of-hospital cardiac arrest were included. Patients were ineligible if they were pregnant, if they were aged &lt; 16 years, if the cardiac arrest had been caused by anaphylaxis or life-threatening asthma, or if adrenaline had already been given.</jats:p> </jats:sec> <jats:sec id="abs1-6"> <jats:title>Interventions</jats:title> <jats:p>Participants were randomised to either adrenaline (1 mg) or placebo in a 1 : 1 allocation ratio by the opening of allocation-concealed treatment packs.</jats:p> </jats:sec> <jats:sec id="abs1-7"> <jats:title>Main outcome measures</jats:title> <jats:p>The primary outcome was survival to 30 days. The secondary outcomes were survival to hospital admission, survival to hospital discharge, survival at 3, 6 and 12 months, neurological outcomes and health-related quality of life through to 6 months. The economic evaluation assessed the incremental cost per quality-adjusted life-year gained from the perspective of the NHS and Personal Social Services. Participants, clinical teams and those assessing patient outcomes were masked to the treatment allocation.</jats:p> </jats:sec> <jats:sec id="abs1-8"> <jats:title>Results</jats:title> <jats:p>From December 2014 to October 2017, 8014 participants were assigned to the adrenaline (<jats:italic>n</jats:italic> = 4015) or to the placebo (<jats:italic>n</jats:italic> = 3999) arm. At 30 days, 130 out of 4012 participants (3.2%) in the adrenaline arm and 94 out of 3995 (2.4%) in the placebo arm were alive (adjusted odds ratio for survival 1.47, 95% confidence interval 1.09 to 1.97). For secondary outcomes, survival to hospital admission was higher for those receiving adrenaline than for those receiving placebo (23.6% vs. 8.0%; adjusted odds ratio 3.83, 95% confidence interval 3.30 to 4.43). The rate of favourable neurological outcome at hospital discharge was not significantly different between the arms (2.2% vs. 1.9%; adjusted odds ratio 1.19, 95% confidence interval 0.85 to 1.68). The pattern of improved survival but no significant improvement in neurological outcomes continued through to 6 months. By 12 months, survival in the adrenaline arm was 2.7%, compared with 2.0% in the placebo arm (adjusted odds ratio 1.38, 95% confidence interval 1.00 to 1.92). An adjusted subgroup analysis did not identify significant interactions. The incremental cost-effectiveness ratio for adrenaline was estimated at £1,693,003 per quality-adjusted life-year gained over the first 6 months after the cardiac arrest event and £81,070 per quality-adjusted life-year gained over the lifetime of survivors. Additional economic analyses estimated incremental cost-effectiveness ratios for adrenaline at £982,880 per percentage point increase in overall survival and £377,232 per percentage point increase in neurological outcomes over the first 6 months after the cardiac arrest.</jats:p> </jats:sec> <jats:sec id="abs1-9"> <jats:title>Limitations</jats:title> <jats:p>The estimate for survival with a favourable neurological outcome is imprecise because of the small numbers of patients surviving with a good outcome.</jats:p> </jats:sec> <jats:sec id="abs1-10"> <jats:title>Conclusions</jats:title> <jats:p>Adrenaline improved long-term survival, but there was no evidence that it significantly improved neurological outcomes. The incremental cost-effectiveness ratio per quality-adjusted life-year exceeds the threshold of £20,000–30,000 per quality-adjusted life-year usually supported by the NHS.</jats:p> </jats:sec> <jats:sec id="abs1-11"> <jats:title>Future work</jats:title> <jats:p>Further research is required to better understand patients’ preferences in relation to survival and neurological outcomes after out-of-hospital cardiac arrest and to aid interpretation of the trial findings from a patient and public perspective.</jats:p> </jats:sec> <jats:sec id="abs1-12"> <jats:title>Trial registration</jats:title> <jats:p>Current Controlled Trials ISRCTN73485024 and EudraCT 2014-000792-11.</jats:p> </jats:sec> <jats:sec id="abs1-13"> <jats:title>Funding</jats:title> <jats:p>This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in <jats:italic>Health Technology Assessment</jats:italic>; Vol. 25, No. 25. See the NIHR Journals Library website for further project information.</jats:p> </jats:sec>

Original publication

DOI

10.3310/hta25250

Type

Journal article

Journal

Health Technology Assessment

Publisher

National Institute for Health Research

Publication Date

04/2021

Volume

25

Pages

1 - 166