Trauma Triage and Scoring (ATLS)

Trauma triage is the use of trauma assessment for prioritising of patients for treatment or transport according to their severity of injury. Primary triage is carried out at the scene of an accident and secondary triage at the casualty clearing station at the site of a major incident. Triage is repeated prior to transport away from the scene and again at the receiving hospital.

The primary survey aims to identify and immediately treat life-threatening injuries and is based on the ABCDE resuscitation system. This includes airway control with stabilisation of the cervical spine, breathing, circulation (including the control of external haemorrhage), disability or neurological status, and exposure or undressing of the patient while also protecting the patient from hypothermia.¹

Priority is then given to patients most likely to deteriorate clinically and triage takes account of vital signs, pre-hospital clinical course, mechanism of injury and other medical conditions.Triage is a dynamic process and patients should be reassessed frequently. In the UK, the T system is conventionally used at a major incident:

• Immediate priority (T1): require immediate life-saving intervention (Red)
• Urgent priority (T2): require significant intervention within two to four hours (Yellow)
• Delayed priority (T3): require intervention, but not within four hours (Green)
• Expectant priority (T4): treatment at an early stage would divert resources from potentially beneficial casualties, with no significant chance of a successful outcome (Blue)

Triage systems are most often used following trauma incidents but mat be required in other situations, such as an influenza epidemic.²

Triage sieve

The triage sieve can be used at the scene of major trauma and involves a rapid assessment.

• Can the patient walk?
  • Yes: Priority 3 (Green - see above)
  • No:
    • Is the patient breathing?
      • No, even after opening airway: Dead
      • Yes, after opening airway: Priority 1 (Red)
      • Yes, without resuscitation:
        • What is the respiratory rate?
          • Above 30/minute or less than 10/minute: Priority 1 (Red)
          • 10-30/minute:
            • What is the pulse rate (or capillary refill time)?
              • Less than 40 or more than 120 (or capillary refill time greater than 2 seconds): Priority 1 (Red)
              • Between 40 and 120 (or capillary refill time less than 2 seconds): Priority 2 (Yellow)

Modified sieve systems are available for use in children.³

The triage sort⁴

The triage sort it is one method used for triage at a casualty clearing station.

A total score of 1-10 indicates priority T1, 11 indicates T2, and 12 indicates T3.

Trauma scores are often audit and research tools used to study the outcomes of trauma and trauma care, rather than predicting the outcome for individual patients. Many different scoring systems have been developed, some are based on physiological scores (e.g. Glasgow Coma Scale) and other systems rely on anatomical description (e.g. Abbreviated Injury Score). There is however no universally accepted scoring system and each system has its own limitations.

Abbreviated injury scale (AIS)⁵

• Since its introduction as an anatomical scoring system in 1969, the AIS has been revised and updated many times.
• The AIS scale is similar to the Organ Injury Scales introduced by the Organ Injury Scaling Committee of the American Association for the Surgery of Trauma, however AIS is designed to reflect the impact of a particular organ injury on patient outcome.
• The Association for the Advancement of Automotive Medicine monitors the scale.

Limitations:

• The AIS scale does not provide a comprehensive measure of severity.
• The AIS scale does not represent a linear scale, i.e. the difference between AIS1 and AIS2 is not the same as the difference between AIS4 and AIS5.
• When used alone, the current AIS version is not useful for predicting patient outcomes or mortality; instead it forms the basis of the ISS and TRISS.

Injury severity score (ISS) and New injury severity score (NISS)

• The ISS was introduced in 1974 as a method for describing patients with multiple injuries and evaluating emergency care. It has since been classed as the 'gold standard' of severity scoring.⁶
• Each injury is initially assigned an AIS score and one of six body regions (head, face, chest, abdomen, extremities, external).
• The highest three AIS scores (only one from each body region may be included) are squared and the ISS is the sum of these scores.
• Limitations:
  • Inaccurate AIS scores are carried forward.
  • Many different injury patterns can yield similar ISS scores.
  • It is not useful as a triage tool.
  • Only considers one injury per body region and therefore may underestimate the severity in trauma victims with multiple injuries affecting one body part.⁶
  • The NISS is a modified version of the ISS developed in 1997. The NISS sums the severity score for the top three AIS injuries regardless of the body region, hence NISS scores greater than ISS values indicate multiple injuries in at least one body region.⁶

Organ injury scale (OIS)

• This scale provides a classification of injury severity scores for individual organs.
• The OIS is based on injury description scaled by values from 1 to 5, representing the least to the most severe injury.
• The Organ Injury Scaling (O.I.S.) Committee of the American Association for the Surgery of Trauma (A.A.S.T.) developed the OIS in 1987; the scoring system has been updated and modified since that time.⁵

Glasgow coma score and Glasgow paediatric coma score

• The Glasgow Coma Score (GCS) and Glasgow Paediatric Coma Score (GPCS) are simple and common method for quantifying the level of consciousness following traumatic brain injury.
• The scale is the sum of three parameters:
  • Best Eye Response
  • Best Verbal Response
  • Best Motor Response
• Scales are based on values ranging between 3 (worst) to 15 (best).⁵

Revised trauma score

• Used as a triage tool in a pre-hospital setting.⁷
• It is a common physiological scoring system based on the first data sets of 3 specific physiological parameters obtained from the patient.
• The three parameters are: the Glasgow Coma Scale (GCS), systemic blood pressure (SBP), and the respiratory rate (RR).⁵

Limitations include the inability to accurately score patients who are intubated and mechanically ventilated.⁷

The acute physiology and chronic health evaluation (APACHE)

• APACHE was first introduced in 1981. APACHE III is an updated version introduced in 1991.⁷
• This evaluation system is used widely for the assessment of illness severity in intensive care units (ICUs).⁷

Trauma and injury severity score (TRISS)⁵

This score determines the probability of patient survival (Ps) from the combination of both anatomical and physiological (ISS and RTS, respectively) scores. A logarithmic regression equation is used:

• Ps = 1/ (1+e^-b), where b = bo + b1(RTS) + b2(ISS) +b3(AgeScore)

RTS and ISS are calculated as above and AgeScore is either 0 if patient <55 years old or 1 if 55 and over. The coefficients b0 – b3 depend on the type of trauma (N.B. there is some variation in the published values for these). A TRISS calculator is available on the Trauma.org website.⁸