• Edward Carlton, Sarah Campbell, Jenny Ingram, Rebecca Kandiyali, Hazel Taylor, Shahid Aziz, Peter Beresford, Jason Kendall, Adam Reuben, Jason Smith, Patricia Jane Vickery, and Jonathan Richard Benger.
• Emergency Department, North Bristol NHS Trust, Bristol, UK.
• BMJ Open. 2018 Oct 2; 8 (10): e025339.

IntroductionObservational data suggest a single high-sensitivity troponin blood test taken at emergency department (ED) presentation could be used to rule out major adverse cardiac events (MACE) in 10%-60% of ED patients with chest pain. This is done using an 'undetectable' cut-off (the Limit of Detection: LoD). We combined the LoD cut-off with ECG findings to create the LoDED strategy. We aim to establish whether the LoDED strategy works under real-life conditions, when compared with existing strategies, in a way that is cost-effective and acceptable to patients.Methods And AnalysisThis is a parallel-group pragmatic randomised controlled trial across UK EDs. Adults presenting to ED with suspected cardiac chest pain will be randomised 1:1. Existing rule-out strategies in current use across study centres, using serial high-sensitivity troponin testing, will be compared with the LoDED strategy. The primary outcome is successful early discharge (discharge from hospital within 4 hours of arrival) without MACE occurring within 30 days. Secondary outcomes include initial length of hospital stay; comparative costs; patient satisfaction and acceptability to patients. To detect a 9% difference between the early discharge rates (assuming an 8% rate in the standard care group) with 90% power, 594 patients need to be recruited, assuming a 95% follow-up rate.Ethics And DisseminationThe study has been approved by the Frenchay Research Ethics Committee (reference 18/SW/0038). Results will be published in an international peer-reviewed journal. Lay summaries will be made available to patients.Trial Registration NumberISRCTN86184521; Pre-results.© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY. Published by BMJ.

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