P2712Integration of new CENTAUR high-sensitivity Troponin I assay with HEART score chest pain pathway to maximise early discharge from emergency department
Abstract Introduction Chest pain is a common presentation to the emergency department (ED). Differentiating those with an Acute Coronary Syndrome from the majority without, within 4 hours, is a priority. Introduction of high-sensitivity TnI assays has the potential to allow early discharge from ED but at the expense of lower specificity. Given the pressure in ED to identify patients who can safely be discharged we developed an algorithm based on the HEART score. This combines the history, ECG, age, risk factors and hsTnI level and outperforms TIMI and GRACE scores in identifying low-risk patients. Patients with a score of ≥4 have an increased major adverse cardiac event (MACE) rate at 30 days; those with a score of <4 are suitable for early discharge. There are no studies utilising the CENTAUR assay combined with a clinical risk score. Methods An initial algorithm based on the HEART score tool was developed incorporating estimated hsTnI boundaries for the CENTAUR assay to inform the “T” component of the tool. This was tested on a 2 month sample of patients presenting with chest pain to the ED. Following review a revised pathway was developed. Patient outcome was recorded with both pathways including subsequent investigations and MACE at 30 days and compared with historical discharge rates for chest pain from the same ED. Sensitivity, specificity and NPV were calculated. Results There were 478 presentations with chest pain and at least one hsTnI level. Age ranged from 13 to 98 years (median 56); 50% were male. There were 21 (4%) MACE within 30 days of the initial presentation (NSTEMI: 18, STEMI: 1, unstable angina requiring CABG: 1, acute pulmonary oedema: 1). A 2 hour hsTnI ≤8 identified a low-risk group with no MACE <30 days. 30% of patients using the initial pathway had a HEART score of ≥4 (100% sens, 73% spec). 70% were suitable for ED discharge; there were no MACE in this group (100% NPV). A revised pathway was derived incorporating previous cardiac history and modified hsTnI boundaries. Applying this to the original cohort would have increased the proportion suitable for ED discharge to 82%. Both pathways improved the proportion of patients who could be discharged directly from ED from a historical 64%. The revised pathway demonstrated improved specificity for the identification of MACE with no loss of sensitivity and excellent negative predictive value. (100% sens, 86% spec, 100% NPV). Conclusions The CENTAUR hs-TnI assay and HEART score with modifications would facilitate the early discharge of patients with chest pain from ED within 4 hours without missing any MACE at 30 days. This conclusion should be validated in a prospective cohort.