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Post-Tonsillectomy Vomiting: Causes, Risks, and Management

Nausea and Vomiting After Tonsillectomy: A Common but Manageable Issue

Postoperative nausea and vomiting (PONV) affects 30–70% of children after tonsillectomy (with or without adenoidectomy). Understanding the causes and prevention strategies reduces complications.

Why It Happens

  • Anesthesia: Volatile agents (sevoflurane), opioids, and nitrous oxide stimulate the chemoreceptor trigger zone (CTZ) and vestibular apparatus.
  • Surgical Factors: Pharyngeal irritation, blood swallowing (even small amounts), vagal stimulation from surgical manipulation.
  • Patient Factors: Age (3–12 years highest risk), female sex, history of PONV or motion sickness, anxiety.
  • Postoperative: Opioid analgesics (codeine, hydrocodone), dehydration, early oral intake.

Risks of Persistent Vomiting

  • Dehydration & Electrolyte Imbalance: Especially dangerous in young children (low reserve).
  • Bleeding: Retching increases venous pressure, risking primary (≤24h) or secondary (5–10 days) hemorrhage.
  • Aspiration: Rare but serious.
  • Delayed Discharge/Readmission: Increases cost and family stress.

Prevention and Management

  1. Multimodal Antiemetic Prophylaxis (Standard of Care):
    • Dexamethasone 0.15–0.5 mg/kg IV intraop (also reduces pain/edema).
    • Ondansetron 0.1 mg/kg IV (or oral disintegrating tablet preop).
    • Consider adding droperidol (age >2) or aprepitant for high-risk patients.
  2. Opioid-Sparing Analgesia: Scheduled acetaminophen + ibuprofen (if no contraindications); limit PRN opioids.
  3. Fluid Management: IV hydration intraop; encourage sips of clear fluids early; advance diet as tolerated.
  4. Rescue for Established Vomiting: Repeat ondansetron (if >6h since last dose), add promethazine or metoclopramide (age-appropriate), IV fluids if dehydrated.

When to Contact the Surgeon

  • Vomiting >3–4 times in 24 hours despite meds.
  • Signs of dehydration (dry mouth, no tears, decreased urine, lethargy).
  • Bright red blood in vomit or “coffee grounds” material.
  • Severe throat/ear pain unrelieved by prescribed analgesics.
  • Fever >102°F (38.9°C).

Most PONV resolves within 24–48 hours. Proactive prophylaxis and hydration are key.

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