Pediatric anesthesia & critical care

Preoperative Oral Esketamine for Perioperative Comfort in Children Undergoing Adenotonsillectomy: A Randomized, Double‐Blind, Dose‐Finding Study

Paediatr AnaesthPublished randomized double-blind trial

Authors' conclusion

Preoperative oral esketamine (1-3 mg/kg) enhances perioperative comfort in children undergoing adenotonsillectomy. The 2 mg/kg dose offers the best balance of efficacy and safety, while 3 mg/kg provides superior analgesia and opioid sparing.

Study context

Population
Children (ASA I–II, 1–6 years) undergoing adenotonsillectomy
Participants
99 children
Comparison
Oral esketamine 1, 2, or 3 mg/kg vs oral 10% glucose (control) 30 min before anesthesia
  • Controln = 26
  • EK1n = 26
  • EK2n = 23
  • EK3n = 24
Primary endpoint
Ramsay Sedation Scale (RSS) at venous cannulation
Follow-up
At venous cannulation
Methodological detailsdose-finding
  • Dose-finding

Primary result

As reported in the abstract

Control

1.00

median · IQR 1.00–2.00

EK1

2.00

median · IQR 1.75–3.00

EK2

2.00

median · IQR 1.00–3.00

EK3

3.00

median · IQR 2.00–3.37

EK1 vs control: P = 0.028 · EK2 vs control: P = 0.049 · EK3 vs control: P < 0.001

All esketamine doses improved sedation and analgesia at cannulation, with largest effect at 3 mg/kg
overall p < 0.001

Secondary outcomes

OutcomeControlEK1EK2EK3P value
FLACC pain score at venous cannulation (primary outcome)EK1 vs control6.00 (3.00-7.00)2.50 (1.00-4.00)2.00 (0.00-4.00)0.00 (0.00-1.75)P = 0.016
FLACC pain score at venous cannulation (primary outcome)EK2 vs controlP = 0.001
FLACC pain score at venous cannulation (primary outcome)EK3 vs controlP < 0.001
PAED score (primary outcome) · 15 min after extubationEK2 vs control · lower in EK2 than control10.00 [6.00-12.00]— not stated in the abstract5.00 [2.00-10.00]— not stated in the abstractP = 0.048

— not stated in the abstract

Remifentanil consumption

Reduced in EK3
120.00 [80.00-159.50] vs. 240.00 [160.00-315.00] μg, p = 0.001

Postoperative pain · 2-6 h, persisting to 48 h in EK3

Lower at 2-6 h in EK2 and EK3
P < 0.05
Persisting to 48 h in EK3
P < 0.05

Sleep quality · 24 h and 48 h

Improved in EK3 at 24 h
P = 0.023
Improved in EK3 at 48 h
P = 0.032

Safety

Adverse events

Did not differ significantly

Original publication

Preoperative Oral Esketamine for Perioperative Comfort in Children Undergoing Adenotonsillectomy: A Randomized, Double‐Blind, Dose‐Finding Study. Paediatr Anaesth. Published 2 November 2026. doi:10.1002/pan.70342

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