The American Association for the Surgery on Trauma (AAST) reported a severity grading system for emergency general surgery. This can be applied to bowel obstruction.
Patient selection: bowel obstruction
Parameters:
(1) degree of obstruction
(2) ischemia
(3) perforation
Obstruction
Ischemia
Perforation
Grade
partial
none
none
I
complete
none
none
II
complete
reversible ischemia (potentially viable)
none
III
complete
gangrenous
none
IV
complete
NA
local
IV
complete
NA
diffuse peritonitis
V
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