AAST abdominal vascular injury scale

Grade*	Description of injury
I	Non-named superior mesenteric artery or superior mesenteric vein branches
	Non-named inferior mesenteric artery or inferior mesenteric vein branches
	Phrenic artery or vein
	Lumbar artery or vein
	Gonadal artery or vein
	Ovarian artery or vein
	Other non-named small arterial or venous structures requiring ligation
II	Right, left, or common hepatic artery
	Splenic artery or vein
	Right or left gastric arteries
	Gastroduodenal artery
	Inferior mesenteric artery, or inferior mesenteric vein, trunk
	Primary named branches of mesenteric artery (eg, ileocolic artery) or mesenteric vein
	Other named abdominal vessels requiring ligation or repair
III	Superior mesenteric vein, trunk
	Renal artery or vein
	Iliac artery or vein
	Hypogastric artery or vein
	Vena cava, infrarenal
IV	Superior mesenteric artery, trunk
	Celiac axis proper
	Vena cava, suprarenal and infrahepatic
	Aorta, infrarenal
V	Portal vein
	Extraparenchymal hepatic vein
	Vena cava, retrohepatic or suprahepatic
	Aorta, suprarenal, subdiaphragmatic

AAST: American Association for the Surgery of Trauma.
* This classification system is applicable to extraparenchymal vascular injuries. If the vessel injury is within 2 cm of the organ parenchyma, refer to specific organ injury scale. Increase one grade for multiple grade III or IV injuries involving >50% vessel circumference. Downgrade one grade if <25% vessel circumference laceration for grades IV or V.

Reproduced with permission from: Moore EE, Cogbill TH, Jurkovich GJ, et al. Organ injury scaling. III: Chest wall, abdominal vascular, ureter, bladder, and urethra. J Trauma 1992; 33:337. Copyright © 1992 Lippincott Williams & Wilkins. Available at: https://www.aast.org/resources-detail/injury-scoring-scale#abdominal (Accessed on December 10, 2019).

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AAST abdominal vascular injury scale