Performance Measure Definition: Trauma Alert Scene Time
Description: This indicator measures how long ATCEMS units remain on scene, assessing and treating patients who meet Physiological or Anatomical criteria for triage to a Trauma Center (referred to as “Trauma Alerts”). It fulfills the specifications for CPI 1.5 from the ATCEMS System Office of the Medical Director (OMD).
Desired Outcome: Trauma Alerts indicate situations where patient outcome is determined in large part by how quickly they receive definitive care. In these cases, ATCEMS personnel expedite assessment, packaging, and initiating transport to a Trauma Center.
Relevance: 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
Formula Description: Arrange the scene time interval data points (for the quarter) from lowest to highest. Count the total number of data points and note the number as N. Multiply 0.90 by the number N (round up if needed) and note as P. Determine the P-th data point in the set counting form the lowest to the highest value. That data point is the 90th percentile scene time interval. This may be accomplished using MS Excel’s percentile function.
Unit of Analysis: Patient Contact
- Numerator: All patients who meet Physiological or Anatomical criteria for triage to a Trauma Center, who are transported to a receiving facility.
- Denominator: Not applicable.
Measure Frequency: Quarterly
Minimum Population/Sample: 20 contacts
Performance Standard: Maintain a 90th percentile scene interval of less than 15 minutes every quarter.
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(s): 90th percentile scene time, i.e. the time interval (in mm:ss) for which 90% of the incident scene time intervals are less than or equal.
- Time-based aggregations (month, quarter, etc.) are based on [Time – Phone Pickup].
- Geographic aggregations are based on incident location.
Limitations: A population of less than 20 patients may result in calculation errors.
- Trauma Alert Scene Time Compliance: This indicator uses the same filter set as the CPI measure, but reports performance as a percentage of patient contacts meeting performance goal. This format supports inclusion in and support of Trauma Bundle reporting (pending).
Notes: Trauma Alert is not a term currently used in ATCEMS System Clinical Operating Guidelines or other official sources. It is used in this setting as a short-hand term for patients meeting Physiological or Anatomical criteria for triage to a Trauma Center.
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 excluded from measure calculation.
Performance is reported on a quarterly basis due to generally small monthly patient counts.
ATCEMS Open Performance Dashboard
- Performance Goal: Trauma Alert Scene Time < 15 Minutes
- Orientation: External
- Format: Line chart for current and previous fiscal year.
- Update Frequency: Quarterly
- Data Source: Open Data table [EMS - Quarterly OMD Clinical Performance Indicators]
City of Austin Open Data Portal
- Medium: Data table
- Table Name: EMS - Quarterly OMD Clinical Performance Indicators
- Columns: 90th Percentile Trauma Alert Scene Interval
- Aggregation Level: Fiscal Quarter
- Update Frequency: Quarterly
Office of the Medical Director, Austin/Travis County EMS System (2014). “Clinical Performance Indicator 1.5: Scene Time Interval for Trauma Activation Patients.”
Office of the Medical Director, Austin/Travis County EMS System (2016). “Clinical Reference CR-30: Regional Trauma System Adult and Pediatric Criteria.” Austin-Travis County Emergency Medical Service System Clinical Operating Guidelines version 021716.
Development Status: Actively reporting
Definition Version: Version A
Revision Date: 2017-01-23
Revised By: David Andersen