Mechanical obstruction | POI | AIPO/ACPO | CIPO | |
Luminal obstruction | Yes | No | No | No |
Motility | Initially ↑ then ↓ proximal to obstruction | ↓ | ↓/uncoordinated | ↓/uncoordinated |
Dilatation | Yes (proximal to obstruction) | No | Yes | Yes |
GI involvement | Proximal to obstruction | Mainly small bowel | Mainly colon | Pan-enteric |
Radiology | Typical "cut-off" point; presence of air-fluid levels | "Cut-off point" occasionally present; air-fluid levels usually absent | "Cut-off point" occasionally present; air-fluid levels sometimes detected | "Cut-off point" occasionally present; air-fluid levels detectable |
Course | Acute | Acute | Acute | Chronic |
Progression | Rapidly evolving toward total obstruction | Self-limiting, slowly improving | May respond to medical treatment; major complication may occur | Variable, generally self-limiting |
Treatment | Surgery | Supportive measures | Medical treatment (neostigmine); decompressive endoscopy or surgery in unresponsive cases | Variable; EN, TPN/HPN often needed |
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