The child with an upper respiratory infection
Stem
A 3-year-old boy, 14 kg, is scheduled for bilateral myringotomy and ear tubes this morning. His mother says he has had a runny nose for four days. He is afebrile at 37.4 °C, playful, with clear rhinorrhea, no cough, and a clear chest. He was born at 34 weeks and his father smokes. This is the second time the case has been booked.
Question
Do you proceed today, and if so, how do you plan the anesthetic?
Ideal answer
HeadlineI proceed: he is afebrile, playful, with clear secretions and a clear chest, for a short case that needs no tube, and I plan against laryngospasm.1
- Weigh risk against delay, then commit. Hyperreactivity lasts at least 6 weeks, so a short delay buys less than parents expect;2 his risk factors are prematurity and smoke exposure.
- Inhaled albuterol before induction, because beta-agonist premedication reduces respiratory events.2
- Sevoflurane, never desflurane; mask or supraglottic device, because the risk runs highest with a tube.2
- Airway manipulation only at a deep plane, and removal either deep or fully awake, never in between, because laryngospasm follows stimulation at a light plane.
- Warn his mother that a cough for a few days is expected.
Watch for: laryngospasm at emergence.
Breaking down the answer
- The size of the risk — a serious event is rare, but laryngospasm risk is up to 10-fold higher within 6 weeks of an infection;3 events are significantly fewer once symptoms have resolved 2–4 weeks.2 Sorting sick from well is the graded judgment.
- Changes if: I postpone — for fever, purulent secretions, a productive cough, wheeze or crackles, lethargy, or airway surgery.1
- Risk factors I name — prematurity, reactive airway disease, parental smoking, nocturnal snoring, copious secretions, nasal congestion, productive cough, fever, and airway surgery such as tonsillectomy or bronchoscopy.1
- Changes if — the surgery or aspiration risk demands an endotracheal tube; I accept the higher risk it carries over a supraglottic airway, itself above a face mask.2
- Why sevoflurane — the best bronchodilator; desflurane increases airway reactivity. Propofol induction and maintenance reduce events further when a line is already in.2
- Why depth matters — laryngospasm follows stimulation at a light plane. Deep and awake removal have similar overall complication rates.2 IV lidocaine before extubation reduces laryngospasm, but only for under 10 minutes.2
- Discharge — a child who desaturated or wheezed stays until the saturation is at baseline on room air.
Follow-up question
At emergence, as you lighten him, he develops inspiratory stridor and then silence, with chest rocking and the saturation falling through 85%. What do you do?
Follow-up answer
HeadlineLaryngospasm; I call for help.
I remove the stimulus, apply CPAP with 100% oxygen through a tight mask, and a vigorous jaw thrust with firm pressure at the laryngospasm notch behind the ramus of the mandible.3 Still falling with an IV: propofol 0.5–0.8 mg/kg.4 Failure or no line: succinylcholine 1–2 mg/kg IV or 4 mg/kg IM, about 56 mg IM for his 14 kg, atropine 0.02 mg/kg for bradycardia.4 I ventilate and reintubate if needed, then watch for negative-pressure pulmonary edema: pink frothy secretions and hypoxemia needing positive pressure and time, until his saturation is at baseline.
Pitfalls that cost points
- Saying the safe interval is 2 weeks and stopping there; the delay is a trade-off.
- Treating a cancellation as a scheduling act: the parent needs the explanation.
Rapid-fire
Q: Why does a viral infection cause bronchospasm weeks later? A: Epithelial damage exposes irritant receptors and the virus increases vagal sensitivity, so hyperreactivity persists after the symptoms clear.
Q: What does the laryngospasm risk look like after a cold? A: About 96 per 1000 anesthetics in children with an acute infection, and the risk persists up to 6 weeks.4
Q: Why does laryngospasm cause negative-pressure pulmonary edema? A: Inspiring against a closed glottis generates very negative intrathoracic pressure, raising capillary transmural pressure and pulling fluid into the alveoli.
Q: Does a benzodiazepine premedication help? A: No; preoperative benzodiazepines are associated with more respiratory events.2
Q: When is succinylcholine contraindicated here? A: With a known myopathy, hyperkalemia or malignant hyperthermia susceptibility; otherwise it remains the drug for life-threatening laryngospasm in a child.
Numbers to know
| Item | Value |
|---|---|
| Airway hyperreactivity after URI | At least 6 weeks2 |
| Fewer events after symptoms resolve | 2–4 weeks2 |
| Laryngospasm risk with recent URI | Up to 10-fold3 |
| Propofol for laryngospasm | 0.5–0.8 mg/kg IV4 |
| Succinylcholine for laryngospasm | 1–2 mg/kg IV; 4 mg/kg IM4 |
| Atropine | 0.02 mg/kg4 |
Links
- laryngospasm, Intraoperative bronchospasm, Tonsillectomy and the bleeding tonsil, Pediatric airway anatomy and equipment, Ambulatory anesthesia and discharge criteria
- Atlas: Monitor atlas: perioperative respiratory events
- SPA guidance on the child with an upper respiratory infection; ASA Practice Guidelines for Management of the Difficult Airway
Sources
- 1.Pediatric upper respiratory infection and anesthesia · OpenAnesthesia · openanesthesia.org
- 2.Perioperative Management of URI (SPA Pediatric Anesthesia Article of the Week 158) · Society for Pediatric Anesthesia, 2023 · pedsanesthesia.org
- 3.Laryngospasm · OpenAnesthesia · openanesthesia.org
- 4.Pediatric laryngospasm (Paediatric Anaesthesia 2008 review, McGill-hosted PDF) · Paediatric Anaesthesia, 2008 · mcgill.ca
Facts on this page were checked against these sources on Oct 14, 2026. Guidelines change; confirm doses against current institutional protocols.