Focal ischaemia of the bowel
Localised bowel pathology may result in focal area of ischaemia.
Underlying causes include strangulation of a hernia, intussusception, or a volvulus in which a loop of bowel twists on itself usually around a fibrous peritoneal band or adhesion.
The ischaemia results from venous infarction due to strangulation. The thin draining veins are occluded by external pressure resulting in venous congestion and hence a failure of arterial supply to the segment of bowel.
The underlying cause requires identification and treatment. If blood flow is not restored, a progression to infarction and necrosis necessitates bowel resection.