[BMJ Publishing Group Ltd and British Cardiovascular Society British Cardiovascular Society Annual Conference ‘Digital Health Revolution’ 3–5 June 2019 - ()] Acute Coronary Syndromes - 150 Comparing the length of stay, efficacy and safety of a new 1 hour "rule-out" pathway to standard care for patients presenting to the emergency departments with a suspected acute coronary syndrome at brighton and sussex university hospitals nhs trust