USMLE Prep - Medical Reference Library

Caustic Ingestion — NPO, Early Endoscopy, and Perforation Surveillance

System: Gastroenterology • Reviewed: Sep 1, 2025 • Step 1Step 2Step 3

Synopsis:

Accidental or intentional ingestion of acids/alkalis causes esophageal/gastric injury. Keep NPO, avoid neutralizing/emesis/NG placement blindly, and perform early endoscopy (within 12–24 h) to grade injury; manage severe injuries in ICU with perforation surveillance and staged nutrition.

Key Points

  • Use the highest‑yield diagnostic test early; do not let testing delay time‑critical therapy.
  • Set objective targets and reassess frequently.
  • Plan definitive source control or disease‑specific therapy when indicated; document follow‑up and patient education.

Algorithm

  1. Airway assessment and resuscitation; keep strict NPO; avoid neutralization/emesis.
  2. Obtain early endoscopy (12–24 h) unless perforation suspected; use CT to assess complications.
  3. Manage based on grade: minor → advance diet; high‑grade → ICU, antibiotics, PPI, surgical consult; plan nutrition (NJT/TPN).
  4. Long‑term: stricture surveillance/dilation; psychosocial evaluation if intentional.

Clinical Synopsis & Reasoning

Accidental or intentional ingestion of acids/alkalis causes esophageal/gastric injury. Keep NPO, avoid neutralizing/emesis/NG placement blindly, and perform early endoscopy (within 12–24 h) to grade injury; manage severe injuries in ICU with perforation surveillance and staged nutrition.


Treatment Strategy & Disposition

Stabilize ABCs. Initiate guideline‑concordant first‑line therapy with precise dosing and continuous monitoring. Escalate to advanced/procedural interventions based on explicit failure criteria. Define ICU, step‑down, and ward disposition triggers; involve specialty teams early.


Epidemiology / Risk Factors

  • Risk varies by comorbidity and precipitants; see citations for condition‑specific data.

Investigations

TestRole / RationaleTypical FindingsNotes
Endoscopy within 12–24 hSeverity gradingZargar gradeAvoid if perforation suspected
CT chest/abdomen with IV contrastComplicationsPerforation/necrosisAdjunct to endoscopy
Labs including lactateSeveritySystemic toxicityGuide resuscitation

Pharmacology

Medication/InterventionMechanismOnsetRole in TherapyLimitations
IV PPIAcid suppressionHoursMucosal protection
Broad antibiotics (selected severe)Infection preventionHoursIf high‑grade injury or perforationPractice varies
Steroids (controversial; selected)Anti‑inflammatoryDaysMay reduce strictures in select grade II injuriesNot with perforation/infection

Prognosis / Complications

  • Outcome depends on timeliness of diagnosis and definitive therapy; monitor for complications.

Patient Education / Counseling

  • Provide red‑flag education, adherence guidance, and explicit return precautions; arrange timely specialty follow‑up.

References

  1. WSES/ESGE statements on caustic ingestion management — Link