Does point of care troponin testing speed up care of cardiac patients in emergency?

INTERVENTION: Point of care troponin testing will be made available on some weeks.On other weeks the point of care troponin machine will be unavailable.The availability of the machine represents the intervention and the weeks that it is available will determined by computer generated randomization prior to the study and then concealed until the monday morning at the beginning of each week.At that time after opening that weeks allocation the machine will either be made available for use( which may save time for patients or not) or withdrawn for one week. If the machine is withdrawn for that week the clinical staff will be forced to use usual (laboratory bench‐top methods) of testing troponin.The expected duration of the trial is 3 months assuming adequate numbers to power the study (150 in each arm)are recruited. CONDITION: Possible Acute Coronary Syndrome in emergency patients PRIMARY OUTCOME: Reduced Length of Stay in the emergency department SECONDARY OUTCOME: The primary analysis will be intention to treat, however it is intended to perform a secondary efficacy analysis which may demonstrate that the machines save time if not always actually used. This is because there will not be mandatory use of the intervention and staff may choose not to use it. INCLUSION CRITERIA: All patients presenting to emergency with possible acute coronary syndrome