Injured structure | AAST grade* | Description of injury |
Stomach | I | Contusion/hematoma; partial-thickness laceration |
II | Laceration <2 cm in GE junction or pylorus; <5 cm in proximal 1/3 stomach; <10 cm in distal 2/3 stomach | |
III | Laceration >2 cm in GE junction or pylorus; >5 cm in proximal 1/3 stomach; >10 cm in distal 2/3 stomach | |
IV | Tissue loss or devascularization <2/3 stomach | |
V | Tissue loss or devascularization >2/3 stomach | |
Duodenum | I | Hematoma involving single portion of duodenum; partial-thickness laceration, no perforation |
II | Hematoma involving more than one portion of duodenum; laceration causing disruption <50% of circumference | |
III | Laceration causing disruption 50 to 75% of circumference of D2; disruption 50 to 100% of D1, D3, D4 | |
IV | Laceration causing disruption >75% of circumference of D2; laceration involving ampulla or distal common bile duct | |
V | Massive disruption of duodenopancreatic complex; devascularization of duodenum | |
Small bowel | I | Contusion or hematoma without devascularization; partial-thickness laceration, no perforation |
II | Laceration involving <50% of circumference | |
III | Laceration involving ≥50% of circumference without transection | |
IV | Transection of the small bowel | |
V | Transection of the small bowel with segmental tissue loss; devascularized segment | |
Colon | I | Contusion or hematoma without devascularization; partial-thickness laceration; no perforation |
II | Laceration involving <50% of circumference | |
III | Laceration involving ≥50% of circumference without transection | |
IV | Transection of the colon | |
V | Transection of the colon with segmental tissue loss; devascularized segment | |
Rectosigmoid and rectum | I | Contusion or hematoma without devascularization; partial-thickness laceration |
II | Laceration involving <50% of circumference | |
III | Laceration involving ≥50% of circumference | |
IV | Full-thickness laceration with extension into the perineum | |
V | Devascularized segment |
AAST: American Association for the Surgery of Trauma; GE: gastroesophageal; D1: first portion of the duodenum; D2: second portion of the duodenum; D3: third portion of the duodenum; D4: fourth portion of the duodenum.
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