As part of the planned implementation of a new clinical pathway using hs-cTnI, the investigators will measure patient outcomes and clinical processes in a real-world scenario throughout an integrated health system across 9 emergency departments (ED).

This is a pragmatic, implementation study testing the implications of a real-world execution of a rapid evaluation pathway for suspected ACS using the Beckman hs-cTnI assay. As the new protocol is executed across 9 EDs within an integrated health system, the investigators will study its effects on patient and system-level metrics. A modified stepped wedge design will be utilized that allows comparison of the RACE-IT pathway with standard of care management

Inclusion Criteria:

• Patients ≥18 years old presenting to the ED for whom a treating clinician suspects ACS and orders a baseline ECG and cardiac troponin.

Exclusion Criteria:

1. ST-segment Myocardial Infarction (STEMI) leading to immediate reperfusion therapy
2. Any ED-drawn hs-cTnI value > 99th percentile (18 ng/L)
3. Clear traumatic cause for symptoms (e.g., direct chest wall trauma, motor vehicle accident)
4. A transfer from another facility
5. Primary residence outside the state of Michigan
6. Previous inclusion in the study
7. Enrolled in hospice