Management of Melena in Enteric Fever
Patients with enteric fever presenting with melena require immediate hemodynamic stabilization, urgent upper endoscopy with therapeutic intervention, and empiric ceftriaxone therapy while awaiting blood culture confirmation.
Initial Assessment and Resuscitation
Hemodynamic evaluation is critical: Check for tachycardia (pulse >100 bpm), hypotension (systolic BP <100 mmHg), or orthostatic changes, which indicate significant blood loss requiring immediate IV access and fluid resuscitation 1, 2.
Obtain blood cultures immediately before starting antibiotics, as they have the highest diagnostic yield within the first week of symptoms (sensitivity 40-80%) 3. Stool and urine cultures become positive after the first week but are less sensitive initially 3.
Laboratory workup should include: Complete blood count, coagulation studies (INR, platelets), BUN/creatinine (elevated BUN:creatinine ratio suggests upper GI bleeding), liver function tests, and electrolytes 2, 3.
Correct coagulopathy: Transfuse fresh frozen plasma if INR >1.5 or platelets if count <50,000/µL 1.
Endoscopic Evaluation and Management
Upper endoscopy should be performed urgently in patients with melena and enteric fever, as gastrointestinal bleeding occurs in approximately 10% of cases, with both upper and lower GI sources possible 4, 5.
Timing of endoscopy: Perform emergently if the patient is hemodynamically unstable or has ongoing bleeding; within 24 hours if stable but with high-risk features (fresh hematemesis, significant hemoglobin drop) 6, 1, 2.
Endoscopic findings in enteric fever: Look for multiple active gastric or duodenal ulcers with hemorrhagic spots, which can occur even though lower GI bleeding from ileal perforation is more classically described 4.
Therapeutic interventions: Use combination hemostatic therapy with epinephrine injection plus thermal coagulation, hemoclips, or hemospray for active bleeding lesions 6, 2.
Monitor closely post-endoscopy: Rebleeding rates are high after initial hemostasis; watch for fresh melena, hematemesis, hemodynamic changes, or falling hemoglobin 7, 2.
Antimicrobial Therapy
Start ceftriaxone empirically as first-line treatment for suspected enteric fever with GI bleeding, particularly in patients with recent travel to South Asia where fluoroquinolone resistance exceeds 70% 3, 5.
Ceftriaxone dosing: Administer IV ceftriaxone for 14 days to reduce relapse risk 3.
Avoid fluoroquinolones as empiric therapy: Despite being listed in older guidelines, ciprofloxacin should only be used if nalidixic acid disc testing confirms susceptibility, as >70% of S. typhi isolates from Asia are fluoroquinolone-resistant 3, 5.
Alternative agents: Azithromycin is an effective oral alternative for uncomplicated disease once susceptibility is confirmed, though it should not be first-line for severe bleeding complications 8, 3.
Do not use chloramphenicol except as a last resort when no other options are available 8.
Management of Specific Complications
If bleeding continues despite endoscopic therapy:
Repeat endoscopy once for persistent or recurrent bleeding to attempt additional hemostatic intervention 7.
Consider interventional radiology: Angiographic embolization is indicated if endoscopy fails or if the patient requires >5 units of blood within 24 hours 6, 2.
External-beam radiation therapy may be considered for refractory bleeding 6.
Surgical intervention: Reserve for uncontrolled hemorrhage not amenable to endoscopic or angiographic control, or for intestinal perforation (a separate complication occurring in 10-15% of enteric fever cases) 3, 5.
If initial upper endoscopy is negative:
Perform capsule endoscopy: The small bowel accounts for ~13% of melena cases with diagnostic yield of ~30%, superior to push enteroscopy 2.
Consider colonoscopy: Lower GI bleeding from ileal ulceration can occur in enteric fever and may present as melena or progress to hematochezia 4.
Critical Pitfalls to Avoid
Do not delay antibiotics in unstable patients: Start ceftriaxone empirically if enteric fever is suspected, even before blood culture results return 3.
Do not rely on initial hemoglobin alone: Acute blood loss may not be reflected immediately due to delayed equilibration 2.
Do not assume lower GI source with melena: Melena almost always indicates upper GI or small bowel bleeding; gastric ulcers can occur in enteric fever despite the classic teaching of ileal involvement 4.
Watch for relapsing bacteremia: Enteric fever can recur weeks after apparent clinical resolution, requiring prolonged antibiotic courses (up to one month in some cases) 4.
Monitor for other complications: Patients with GI bleeding may also develop encephalopathy, myocardial dysfunction, or other multisystem complications requiring intensive care 9, 5.
Supportive Care
Maintain adequate hydration: IV fluids are essential throughout treatment, especially with ongoing bleeding and fever 6.
Blood transfusion strategy: Transfuse to maintain hemodynamic stability; in unstable patients, use a more liberal threshold than the standard 7 g/dL 2.
Nutritional support: Once hemodynamically stable 4-6 hours post-endoscopy, patients can resume oral intake; prolonged fasting is unnecessary 7.
Consider steroids: High-dose dexamethasone may be beneficial in severe cases with multisystem involvement 9.