ATCEMS Performance Dashboard > Aspirin Administration to Patients Having a Heart Attack > Performance Measure Definition: STEMI Alert Scene Interval Compliance
Performance Measure Definition: STEMI Alert Scene Interval Compliance

Description: This indicator measures how long ATCEMS units remain on scene, assessing and treating patients who meet STEMI Alert criteria.
Desired Outcome:  ATCEMS crews rapidly identify patients meeting STEMI Alert criteria and then minimize time spent on scene, quickly beginning transport to an appropriate STEMI Center.
Relevance:  STEMI Alert patients require rapid access to definitive care for their conditions.  In these cases, ATCEMS personnel must prioritize initiation of transport over non-lifesaving care.
Measure Domain: Clinical care
Type of Measure:  Process

Operational Specifications
Formula Description:  STEMI Alert Scene Interval Compliance is calculated by dividing the count of STEMI Alert patient contacts with a scene time interval of less than 15 minutes by the count of all STEMI Alert patients contacts.
Unit of Analysis:  Patient contacts
  • Numerator: Patient contacts documented as meeting STEMI Alert criteria who are transported to a receiving facility and have a scene interval of less than 15 minutes.
  • Denominator:  All patient contacts meeting STEMI Alert criteria who are transported to a receiving facility.
Measure Frequency:  Quarterly
Minimum Population/Sample:  None
Performance Standard:  ATCEMS personnel will initiate transport of alert patients within 15 minutes of arrival at scene, in 90 percent of all cases.
Acceptable Quality Level:  Not defined
Interval Description:  The time interval beginning with the Scene Arrival Time for the first on-scene transporting unit and ending with the Scene Departure time (from CAD) for the unit transporting the patient.
Reporting Value:  Percent of patient contacts meeting performance target.
  • Temporal aggregations (month, hour of day, etc.) are based on the date/time of earliest recorded call pickup. 
  • Geographic aggregations are based on incident locations.
Stratification: None
Limitations:  None
Related Measures: 
  • CPI 03 - STEMI Alert Scene Time: The CPI indicator uses the same filter set as the bundle measure, but reports performance at the 90th percentile of scene intervals for a fiscal quarter. The CPI measure excludes patients for whom a scene delay was appropriate; these patients are included in the “goal met” population for the bundle compliance measure.
Notes: Transport delays may be unavoidable in some cases, such as delayed access to patients due to scene safety issues, difficulty identifying or reaching patient, etc. These cases are reviewed by Clinical Performance Management personnel. They are generally treated as “goal met” for purposes of measure calculation. 
Performance is reported on a quarterly basis due to generally small monthly patient counts. 
The measure definition was edited in September 2016, changing exclusion criteria, numerator calculations, and denominator calculations in order to support future performance bundle reporting.

ATCEMS Open Performance Dashboard
City of Austin Open Data Portal
ATCEMS System Performance Dashboard

Office of the Medical Director, Austin/Travis County EMS System (2016).  “Clinical Standard CS-33: STEMI Alert Criteria.” Austin-Travis County Emergency Medical Service System Clinical Operating Guidelines version 021716.

Development Status: Actively reporting 
Definition Version: Version C
Revision Date: 2017-04-26
Revised By: David Andersen