Paediatric tonsillectomy with a recent upper respiratory tract infection and a history of obstructive sleep apnoea
A 4-year-old boy (18 kg) is scheduled for adenotonsillectomy for obstructive sleep apnoea. He had a runny nose and a low-grade fever 10 days ago and still has a mild cough, but he is afebrile today and his chest is clear. He has a history of snoring, witnessed apnoeas, and daytime somnolence. He is anxious and will not tolerate an intravenous cannula awake. The parents are keen to proceed to avoid another cancellation. The anaesthetic plan is inhalational induction, intubation, and opioid-sparing analgesia with paracetamol and ibuprofen.
1. Would you proceed with surgery today? Justify your decision using evidence and risk factors.
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Decision: I would defer surgery for at least 2 weeks, or at least until the cough has settled, unless there is a compelling reason such as severe OSA with cor pulmonale or failure to thrive.
Reasoning:
- A recent upper respiratory tract infection within 2-4 weeks increases the risk of perioperative respiratory adverse events, particularly laryngospasm, bronchospasm, and desaturation. The risk is highest in children with a current cough, nasal congestion, or fever.
- This child has additional risk factors: obstructive sleep apnoea, which increases sensitivity to opioids and the risk of postoperative respiratory depression, and age under 6 years.
- The fact that he is afebrile with a clear chest reduces but does not eliminate the risk. A mild cough at 10 days still represents an active airway inflammatory state.
- The parents' preference to avoid cancellation is understandable, but the child's safety takes priority. I would explain the risks, document the discussion, and arrange a new date with a clear plan for re-assessment.
If surgery were unavoidable: I would use a cautious inhalational induction, avoid opioids where possible, use a supraglottic airway or intubation with adequate depth, and plan for a high-dependency bed postoperatively.
2. Assuming surgery proceeds, describe the intraoperative and postoperative analgesic plan that minimises opioid-related respiratory complications.
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Intraoperative:
- Inhalational induction with sevoflurane and oxygen/air. Establish intravenous access after induction.
- Secure the airway with a reinforced tracheal tube or a supraglottic airway, depending on the surgical position and preference. Maintain spontaneous ventilation until the airway is secure.
- Use a multimodal technique: paracetamol 15 mg/kg and ibuprofen 10 mg/kg (if no contraindication), plus dexamethasone 0.15-0.5 mg/kg for nausea and airway oedema.
- Consider a small dose of morphine (0.05-0.1 mg/kg) only if needed, or avoid opioids entirely and use a low-dose remifentanil infusion intraoperatively with careful monitoring. Avoid codeine and tramadol because of CYP2D6 variability.
- Consider a local anaesthetic infiltration of the tonsillar beds by the surgeon.
Postoperative:
- Admit to a ward with oximetry and nursing staff experienced in paediatric OSA. Consider a high-dependency bed for the first night if there is a history of severe OSA.
- Continue regular paracetamol and ibuprofen. Avoid opioids unless there is severe pain, and if used, give small titrated doses with continuous oximetry.
- Monitor for bleeding, dehydration, and respiratory depression. Have naloxone available.
- Discharge criteria should include adequate oral intake, stable oximetry, and no apnoeas.