Ketamine Pediatric Dose — Sedation & Procedural Use
Ketamine is a dissociative anesthetic that acts primarily as an NMDA receptor antagonist, producing dose-dependent sedation, analgesia, and amnesia while generally preserving airway reflexes and hemodynamic stability. It is widely used in pediatric emergency and procedural settings for short-term sedation and procedural analgesia. Its favorable safety profile and rapid onset make it a first-line agent in many pediatric acute care protocols.
Pediatric Dosing
- IV (intermittent sedation): 1–2 mg/kg per dose IV every 2 hours as needed (PRN)
- IM (procedural sedation): 2–4 mg/kg IM
Dose selection should be guided by the clinical indication, depth of sedation required, and patient-specific factors. The lower end of each range is appropriate for patients who may be more sensitive to dissociative effects or when combining with other sedating agents.
Worked example — IV route, 20 kg child: 20 kg × 1–2 mg/kg = 20–40 mg IV per dose. Worked example — IM route, 20 kg child: 20 kg × 2–4 mg/kg = 40–80 mg IM. Consult institutional protocol for maximum single-dose limits and repeat dosing intervals.
Indications and Clinical Context
Ketamine is indicated for procedural sedation and short-term pain management in pediatric patients undergoing painful or anxiety-provoking procedures such as laceration repair, fracture reduction, burn wound care, and lumbar puncture. Its dissociative mechanism allows for effective sedation while typically maintaining spontaneous respiration and laryngeal protective reflexes, making it particularly valuable in settings where advanced airway management resources may be limited.
In the context of PALS and pediatric emergency guidelines, ketamine is recognized as a preferred agent for procedural sedation given its rapid onset (IV: ~1 minute; IM: ~3–5 minutes), predictable duration, and analgesic properties. It is especially useful in hemodynamically unstable patients, as its sympathomimetic effects can help maintain blood pressure and heart rate during procedures.
Administration and Monitoring
IV doses should be administered slowly over 1–2 minutes to reduce the risk of respiratory depression or apnea at higher doses. IM administration is appropriate when IV access is unavailable or when rapid IV placement is not feasible. Continuous pulse oximetry, cardiac monitoring, and end-tidal CO₂ monitoring (if available) are recommended throughout the procedure. Suction and airway rescue equipment must be immediately available.
- Emergence reactions: Hallucinations or dysphoria may occur on recovery; co-administration of a benzodiazepine (per institutional protocol) may be considered in select patients.
- Hypersalivation: Concurrent use of an antisialagogue (e.g., glycopyrrolate) may be warranted; consult institutional protocol.
- Contraindications: Use with caution in patients with known or suspected elevated intracranial or intraocular pressure, active psychosis, or known hypersensitivity to ketamine.
- Recovery: Patients should be monitored until return to baseline mental status before discharge from the monitored setting.
Disclaimer: This article is an educational reference summarizing standard pediatric dosing values. It is not a substitute for clinical judgment. Always verify doses against institutional protocols, the current edition of authoritative references (e.g., Lexicomp, Harriet Lane Handbook, PALS guidelines), the patient’s accurate weight, and any patient-specific factors (renal/hepatic function, allergies, comedications) before administration.