Management of Gastrointestinal Bleeding with Melena and Constipation

Immediate Assessment and Stabilization

The American College of Cardiology recommends calculating the shock index (heart rate/systolic blood pressure) immediately—a value >1 indicates hemodynamic instability and predicts poor outcomes 1, 2
Check for orthostatic hypotension, which indicates significant blood loss requiring ICU admission 1
Perform digital rectal examination to confirm melena and exclude anorectal pathology 1

For hemodynamically stable patients, calculate the Oakland score (includes age, gender, previous LGIB admission, digital rectal findings, heart rate, systolic BP, and hemoglobin) 1
Oakland score ≤8 points: safe for urgent outpatient investigation 1
Oakland score >8 points: requires hospital admission 1

Initiate IV fluid resuscitation immediately with goal of normalizing blood pressure and heart rate 3
Use restrictive transfusion thresholds: maintain hemoglobin >7 g/dL for patients without cardiovascular disease 1
For patients with cardiovascular disease or massive bleeding, maintain hemoglobin >8-9 g/dL 1, 3
Transfuse fresh frozen plasma if INR >1.5 1, 2
Transfuse platelets if platelet count <50,000/µL 1, 2

For hemodynamically unstable patients (shock index >1), perform CT angiography immediately—this provides the fastest, least invasive means to localize active bleeding 1, 2
Following positive CTA, proceed to catheter angiography with embolization within 60 minutes 1
For hemodynamically stable patients, perform upper endoscopy (esophagogastroduodenoscopy) first, as melena typically indicates upper GI bleeding 3, 4

Rule out fecal impaction during digital rectal examination 1
Avoid aggressive bowel preparation if patient is actively bleeding or hemodynamically unstable 3
Consider gentle laxatives only after hemodynamic stability is achieved and active bleeding is controlled 1

If patient on warfarin, interrupt warfarin immediately and reverse with prothrombin complex concentrate and vitamin K for unstable hemorrhage 1
If patient on aspirin, permanently discontinue aspirin if used for primary prophylaxis 1
Do not routinely stop aspirin for secondary prevention; if stopped, restart as soon as hemostasis is achieved 1

Failure to consider upper GI source in patients presenting with melena and hemodynamic instability leads to delayed diagnosis—always perform upper endoscopy first 2, 3
Do not delay resuscitation to obtain imaging in unstable patients—stabilize first, then image 3
Mortality in GI bleeding relates more to comorbidities than exsanguination (3.4% overall, but 18% for inpatient-onset bleeding and 20% for patients requiring ≥4 units) 1
If patient remains unstable despite aggressive resuscitation, proceed directly to surgery rather than pursuing further diagnostic studies 1