Anesthesiology APPLIED Exam › Pediatric and neonatal

Emergence delirium

Pediatric and neonatal·~5 min read· Physician-reviewed✓ Sourced · 3

Stem

A 4-year-old boy, 16 kg, had an adenotonsillectomy for snoring under sevoflurane anesthesia with an endotracheal tube, intravenous dexamethasone and acetaminophen, and fentanyl 1 mcg/kg. He was extubated awake. Ten minutes after arriving in recovery he is thrashing, kicking, arching and screaming, pulling at his IV, does not make eye contact and does not respond to his mother's voice. SpO2 is 97% on room air, heart rate 140.

Question

What is happening, and how do you manage him?

Ideal answer

HeadlineThis looks like emergence delirium, but it is a diagnosis of exclusion: the dangerous causes look the same, so I rule them out first.

Protect him; mouth, breathing, glucose. Hypoxia, hypercarbia, hypoglycemia, hypotension and pain;¹ after a tonsillectomy, bleeding in his mouth and obstruction.
Score the behavior on the PAED scale. No eye contact, no purposeful action, no awareness, inconsolable crying; above 10 supports the diagnosis.¹
Quiet room, mother at the bedside, because most episodes are self-limited; someone guards the IV and airway.¹
Dexmedetomidine 0.3–0.5 mcg/kg if it persists. A slow bolus, about 5–8 mcg, or propofol 0.5–1 mg/kg, 8–16 mg; fentanyl 1–2 mcg/kg, 16–32 mcg, if pain contributes.¹

Watch for: Obstruction after any sedative in this snorer: monitored, oxygen ready, score reassessed before discharge.

Breaking down the answer

The full list of mimics — raised intracranial pressure also presents as an agitated child;¹ naming the killers first shows judgment. Changes if: a falling saturation or a bleeding tonsillar bed.
Know who gets it — preschool children aged 2 to 6, ENT and eye surgery, preoperative anxiety, and the low-solubility volatiles, sevoflurane highest, then desflurane, isoflurane, propofol and halothane.¹ Duration and depth of anesthesia do not change the risk.¹ SPA flags ENT too.²
Why a named scale — PAED scores five behaviors from 0 to 4, and a score above 10 warrants intervention;¹ pain is the main confounder: a child in pain usually still looks at and reaches for his mother.
Supportive care before drugs — most episodes resolve without medication, and parents should be part of the decision.¹ I treat when he is hurting himself or it does not settle within a few minutes.
Drug to the cause — dexmedetomidine or propofol for delirium, an opioid when pain is part of it;¹ in an OSA child small doses, because each one can obstruct his airway.
Prevention beats rescue — propofol-based anesthesia, opioids, dexmedetomidine, clonidine and ketamine all lower the incidence, while midazolam premedication is inconsistent.¹ In one trial dexmedetomidine 0.2 mcg/kg near the end of a sevoflurane anesthetic cut it from 42% to 15%.³

Follow-up question

You give propofol 16 mg. He calms within a minute, but now he is snoring, with suprasternal retractions, and his saturation falls to 86%. What do you do?

Follow-up answer

HeadlineUpper airway obstruction from sedation in a child with sleep-disordered breathing; I call for help and tell the nurse what I am treating.

Laryngospasm and blood in the airway are on my list. I give 100% oxygen by mask, open the airway with jaw thrust and a lateral position, and apply CPAP; I suction gently and look for bleeding from the tonsillar bed. If he does not improve, a nasal airway inserted carefully or, for laryngospasm, deeper propofol and succinylcholine if needed. I reassess saturation, breathing and color continuously, keep continuous pulse oximetry, and admit him for overnight monitoring rather than discharge him the same day.

Pitfalls that cost points

Discharging him without a reassessment once the drug wears off.
Restraining a thrashing child without guarding the IV, drains and the surgical site.

Rapid-fire

Q: How long after emergence can it start? A: Usually soon after emergence, but it can be delayed up to 45 minutes.¹

Q: Does it occur without pain? A: Yes; it occurs after non-painful procedures such as MRI under volatile anesthesia.¹

Q: Why does sevoflurane cause it? A: The mechanism is unknown; rapid emergence and sevoflurane excitation of locus ceruleus neurons in animal studies are two proposed explanations.¹

Q: What do you tell his mother? A: It is usually self-limited, and some children show behavior changes such as sleep or separation anxiety for a while after discharge.¹

Q: Which intraoperative dexmedetomidine dose does the SPA tonsillectomy guide list? A: 0.5–1 mcg/kg, opioid sparing and possibly lowering the risk of emergence delirium.²

Numbers to know

Item	Value
Peak age	2–6 years¹
PAED score	5 items, 0–4 each; >10 warrants treatment¹
Dexmedetomidine rescue	0.3–0.5 mcg/kg slow IV¹
Propofol rescue	0.5–1 mg/kg IV¹
Fentanyl	1–2 mcg/kg IV¹
Prophylactic dexmedetomidine (one RCT)	0.2 mcg/kg: 15% vs 42%³

Sources

1.Emergence Delirium in Children · OpenAnesthesia · openanesthesia.orgRisk factors, PAED threshold >10, differential diagnosis, rescue doses of dexmedetomidine, propofol and fentanyl.
2.Tonsillectomy and Adenoidectomy (SPA Case Guide) · Society for Pediatric Anesthesia, 2023 · www2.pedsanesthesia.org
3.Effect of fixed-dose intravenous dexmedetomidine on emergence delirium after general anesthesia for a surgery in pediatric patients: a randomized controlled trial · Qatar Medical Journal, 2025 · ebi.ac.uk66 children aged 2-12 years, sevoflurane; dexmedetomidine 0.2 mcg/kg over 20 min near the end of surgery; emergence delirium 15% vs 42% with saline.

Facts on this page were checked against these sources on Oct 16, 2026. Guidelines change; confirm doses against current institutional protocols.