Postoperative Hematemesis: Differential Diagnosis and Urgent Evaluation

Vomiting blood (hematemesis) after surgery requires immediate evaluation. The differential spans surgical complications, anesthesia effects, and preexisting conditions.

Differential Diagnosis

1. GI mucosal injury: Stress ulceration (Curling's/Cushing's), NSAID/anticoagulant effect, ischemia.
2. Surgical site bleeding: Anastomotic leak (gastric, colorectal), staple line bleed, mesenteric vessel injury.
3. Swallowed intraoperative blood: Airway/oropharyngeal blood from intubation, oral/nasal surgery, tracheostomy → later emesis.
4. Postoperative nausea/vomiting (PONV): Forceful retching → Mallory-Weiss tear (mucosal laceration at GE junction).
5. Coagulopathy: Dilutional, hepatic dysfunction, DIC, anticoagulant rebound.
6. Dieulafoy lesion / angiodysplasia: Unmasked by stress.
7. Esophageal varices: Portal hypertension decompensated by surgery stress.

Immediate Assessment

• Hemodynamics: Orthostatic vitals, lactate, urine output.
• Labs: CBC, coags (PT/INR, aPTT, fibrinogen), type & screen, LFTs, amylase/lipase.
• NG tube lavage: Red blood vs. coffee ground → active vs. slowed bleed.
• Endoscopy (EGD): Gold standard—diagnostic and therapeutic (clips, injection, banding, cautery).
• CT angiography: If unstable or EGD unavailable/negative.

Management Principles

• Airway protection (intubate if altered mental status, massive bleed).
• Resuscitation: Crystalloid → blood products (1:1:1 massive transfusion protocol).
• PPI IV infusion (pantoprazole 80 mg bolus + 8 mg/hr) for peptic source.
• Reverse anticoagulants if indicated (vitamin K, PCC, andexanet, idarucizumab).
• Surgical re-exploration if hemodynamic instability persists or surgical source confirmed.

Hematemesis post-op is a surgical emergency until proven otherwise. Early endoscopy within 24 hrs improves outcomes.