Figure 3. Estimated Cumulative Costs Over Time for Ambulance Attendances for Chest Pain With a Prehospital Risk Stratification and Point-of-Care Troponin Model.

Shown are estimated cumulative costs for the first 180 days, with setup costs estimated at $4.97 million assuming 60 000 chest pain presentations per year in Victoria, Australia (population at risk, 6.7 million people), and estimated cumulative costs for the first 5 years. The break-even point was 121 days for the prehospital model without prehospital discharge (dotted blue line), 33 days with prehospital discharge using the history, electrocardiogram, age, risk factors, and troponin (HEART) risk score (dotted green line), and 19 days with prehospital discharge using the Early Chest Pain Admission Mortality and Myocardial Infarction (ECAMM) score (dotted red line).