Paediatric Patient with Recent Upper Respiratory Tract Infection
A 3-year-old boy (weight 15 kg) is scheduled for elective inguinal hernia repair. He has had a runny nose and mild cough for 3 days, but is afebrile and playful. His mother reports he had a similar episode 2 weeks ago. On examination, he has clear nasal discharge and occasional wheeze. His oxygen saturation is 98% on room air. The anaesthetist must decide whether to proceed with anaesthesia or postpone. The child is otherwise healthy, with no history of asthma or prematurity.
1. What factors would you consider in deciding whether to proceed with anaesthesia?
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Consider the child's current symptoms: clear rhinorrhoea and mild cough without fever or systemic illness suggest a viral upper respiratory tract infection (URTI). Recent URTI (within 2–4 weeks) increases the risk of perioperative respiratory adverse events (PRAEs) such as laryngospasm, bronchospasm, and desaturation. However, the risk is highest in the first 2 weeks after URTI and decreases thereafter. The child is afebrile and systemically well, which lowers risk. Other factors: the type of surgery (minor, low-risk), the child's age (3 years), and the presence of wheeze (which may indicate reactive airways). The decision should be individualised, considering the urgency of surgery and parental preferences. Guidelines suggest that for minor surgery, it is reasonable to proceed if the child is afebrile and systemically well, but the anaesthetist should be prepared for airway complications and use a laryngeal mask airway (LMA) if appropriate to reduce airway irritation. If the child had a fever or purulent secretions, postponement would be advised.
2. If you decide to proceed, what anaesthetic techniques would you use to minimise the risk of perioperative respiratory adverse events?
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To minimise PRAEs: use a laryngeal mask airway (LMA) instead of endotracheal tube if feasible, as it reduces airway stimulation. Ensure deep anaesthesia before airway manipulation. Consider premedication with salbutamol if there is wheeze, and use humidified gases. Avoid unnecessary suctioning. Maintain oxygenation and consider using a circle system with low fresh gas flow. If inhalational induction is used, sevoflurane is preferred. Ensure adequate analgesia with regional techniques (e.g., ilioinguinal block) to reduce opioid use. Monitor closely for laryngospasm and bronchospasm, and have bronchodilators and suction ready. Consider prophylactic dexamethasone? Not routinely. Postoperative: ensure adequate hydration and pain control. Discharge with advice to return if symptoms worsen.