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NCEPOD: Trauma - Who Cares? - London Health Programmes

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APPENDIX B - Injury severity scoreAbbreviated Injury ScaleThe Abbreviated Injury Scale (AIS) is an anatomical scoringsystem fi rst introduced in 1969. Injuries are ranked on a scaleof 1 to 6, with 1 being minor, 4 severe and 6 an unsurvivableinjury. This represents the ‘threat to life’ associated withan injury and is not meant to represent a comprehensivemeasure of severity. The AIS is not an injury scale, in that thedifference between AIS1 and AIS2 is not the same as thatbetween AIS4 and AIS5.Injury Severity ScoreThe Injury Severity Score (ISS) is an anatomical scoringsystem that provides an overall score for patients withmultiple injuries. Each injury is assigned an AbbreviatedInjury Scale (AIS) score and is allocated to one of six bodyregions (Head, Face, Chest, Abdomen, Extremities (includingPelvis), External). Only the highest AIS score in each bodyregion is used. The three most severely injured body regionshave their score squared and added together to produce theISS score.AIS ScoreInjuryAn example of the ISS calculation is shown below:1 Minor2 Moderate3 Serious4 Severe5 Critical6 UnsurvivableRegionInjuryDescriptionAISSquareTopThreeHead & Neck Cerebral Contusion 3 9Face No Injury 0Chest Flail Chest 4 16AbdomenMinor Contusion of2Liver Complex5 25Rupture SpleenExtremity Fractured femur 3External No Injury 0Injury Severity Score: 50The ISS score takes values from 0 to 75. If an injury isassigned an AIS of 6 (unsurvivable injury), the ISS scoreis automatically assigned to 75. The ISS score correlateslinearly with mortality, morbidity, hospital stay and othermeasures of severity.Tables and information taken from http://www.trauma.org/scores/ais.html and http://www.trauma.org/scores/iss.html134

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