AAST liver injury scale

Changed by Henry Knipe, 31 Aug 2016

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The AAST (American Association for the Surgery of Trauma) liver injury scale 1994 revision is the most widely used grading system at the time of writing (mid 2016).

Classification

grade I
- haematoma: subcapsular, <10% surface area
- laceration: capsular tear, <1 cm parenchymal depth
grade II
- haematoma: subcapsular, 10-50% surface area
- haematoma: intraparenchymal <10 cm diameter
- laceration: capsular tear 1-3 cm parenchymal depth, <10 cm length
grade III
- haematoma: subcapsular, >50% surface area of ruptured subcapsular or parenchymal haematoma
- haematoma: intraparenchymal >10 cm or expanding
- laceration: capsular tear >3 cm parenchymal depth
grade IV
- laceration: parenchymal disruption involving 25-75% hepatic lobe or involves 1-3 Couinaud segments
grade V
- laceration: parenchymal disruption involving >75% of hepatic lobe or involves >3 Couinaud segments (within one lobe)
- vascular: juxtahepatic venous injuries (retrohepatic vena cava / central major hepatic veins)
grade VI
- vascular: hepatic avulsion

~~NB Advance~~N.b. advance one grade for multiple injuries up to grade III.

1.<a href="https://www.aast.org/resources-detail/injury-scoring-scale#liver">The American Association for the Surgery of Trauma - Injury Scoring Scale [website]</a><span class="auto"></span>
2. Tinkoff G, Esposito T, Reed J et al. American Association for the Surgery of Trauma Organ Injury Scale I: Spleen, Liver, and Kidney, Validation Based on the National Trauma Data Bank. J Am Coll Surg. 2008;207(5):646-655. <a href="https://doi.org/10.1016/j.jamcollsurg.2008.06.342">doi:10.1016/j.jamcollsurg.2008.06.342</a>
<a href="http://www.aast.org/library/traumatools/injuryscoringscales.aspx">AAST official website</a><span class="auto"></span>

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AAST liver injury scale

Updates to Article Attributes

Classification

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