Intramuscular Ketamine for Pediatric Procedural Sedation

Safety Profile

• In healthy pediatric patients, intramuscular ketamine provides safe and highly effective procedural sedation when given according to established protocols with continuous monitoring and immediate availability of resuscitation equipment【1】【2】【3】【4】【5】.
• Large cohort studies in emergency departments report no deaths, no intubations, and no serious adverse events related to ketamine sedation【3】【5】.
• Airway complications (malalignment, laryngospasm, apnea, respiratory depression) occur in ≈1.4 % of cases and are resolved quickly with simple maneuvers (jaw thrust, repositioning) without need for intubation【3】.
• Laryngospasm in standard ED procedural sedation is observed in 0.9–1.4 % of children【3】【4】【5】.
• Emesis occurs in ≈6.7 % of patients; the odds increase by 1.25 × per additional year of age【3】【6】.
• Recovery agitation is mild in 17.6 % and moderate‑to‑severe in 1.6 %; higher rates are seen in younger children and those with ASA status > I【3】【6】.
• No hospitalizations have been required for ketamine‑related complications in large pediatric ED cohorts【3】.
• In preschool children undergoing upper endoscopy, laryngospasm rises to 8.2–14 %, with the highest risk in children < 6 yr (13.9 % vs 3.6 % in older children)【7】【4】【5】.

Dosing Recommendations

• Initial dose: 4 mg/kg IM produces surgical‑level anesthesia within 3–4 min, lasting 12–25 min; emergency‑medicine guidelines endorse this dose as optimal for procedural sedation【3】【6】.
• Redosing: If adequate sedation is not achieved after 5–10 min, give an additional 2–4 mg/kg IM【3】【6】.

Adjunctive Medications

• Atropine 0.01 mg/kg (minimum 0.1 mg, maximum 0.5 mg) should be administered before ketamine to reduce hypersalivation【1】【2】【6】.
• Midazolam does not reduce recovery agitation and is not routinely recommended (Level A evidence from two Class I RCTs)【7】【4】.
  
  • Agitation rates: ketamine alone 7.1 % vs ketamine + midazolam 6.2 %【2】【7】【6】【4】.
  • In children > 10 yr, midazolam increases agitation (5.7 % vs 35.7 %; absolute difference ‑30 %; 95 % CI ‑49.3 % to ‑10.7 %)【1】【2】【7】【6】【4】.
  • Midazolam may reduce emesis (19.4 % vs 9.6 %; absolute difference 9.8 %; 95 % CI 1.4 %–18.2 %), though one study showed only a trend (p = 0.058)【2】【7】【6】【4】.
• Consider low‑dose midazolam (0.05 mg/kg, max 2 mg) only when emergence reactions are a specific concern, recognizing no benefit for agitation and potential worsening in older children.

Monitoring Requirements

• Ketamine must be administered by, or under direct supervision of, physicians experienced in airway management, with emergency airway equipment immediately available【8】. Required equipment includes:
  
  • Oxygen and suction【8】
  • Bag‑valve‑mask ventilation【8】
  • Oral and nasal airways【8】
  • Age‑ and size‑appropriate resuscitation tools【8】
  • Continuous vital‑sign monitoring capability【8】
• Continuous monitoring of oxygen saturation, heart rate, and blood pressure is recommended throughout the procedure and recovery【8】.

Fasting Considerations

• Procedural urgency dictates proceeding regardless of fasting status; no aspiration events have been reported in large ED ketamine cohorts despite variable fasting【3】【4】【5】.
• Non‑compliance with elective fasting guidelines does not increase aspiration risk【8】.
• For children with established aspiration‑risk factors (e.g., serious illness, obstructive sleep apnea, obesity, age < 12 months, bowel obstruction), clinicians should weigh risks versus benefits of delaying after a substantial meal【8】.
• The ability to administer IM ketamine without IV access makes it especially useful when delays for IV placement are undesirable【8】.

Efficacy and Comparative Effectiveness

• Ketamine achieves adequate sedation in 98–100 % of pediatric procedures across multiple Class I and II studies【3】【7】【4】【5】.
• Compared with intranasal midazolam for laceration repair, ketamine yields 100 % cooperation vs 70 % (p < 0.01)【7】【4】【5】.
• Compared with IM meperidine/promethazine/chlorpromazine, ketamine produces a lower mean OSBD‑R pain score (2.7 vs 9.8, p < 0.003)【7】【4】【5】.
• Compared with fentanyl/midazolam for orthopedic procedures, ketamine results in a lower mean OSBD‑R score (1.12 vs 2.70, p < 0.0001)【7】【4】【5】.
• Median discharge time after a single IM ketamine dose is ≈110 minutes; total recovery ranges from 60–130 minutes depending on dose【3】【2】.

Satisfaction

• High parental and provider satisfaction with IM ketamine sedation is consistently reported across studies【5】.

Ketamine Procedural Sedation Guidelines for Children

Dosing Recommendations

• Intravenous (IV) ketamine – Pediatric emergency medicine guidelines advise an initial dose of 1–2 mg/kg IV, titrated to the desired effect, with the option to redose with half to a full initial amount as needed. [9][10]
• Intramuscular (IM) ketamine – Pediatric emergency medicine guidelines recommend an initial IM dose of 4 mg/kg, with additional 2–4 mg/kg doses given at 5–10 minute intervals if sedation is insufficient. [9][10]11
• Adjunctive midazolam – Co‑administration of midazolam 0.05–0.2 mg/kg can lessen emergence reactions (which occur in 10–30 % of adults and less frequently in children). Evidence from gastroenterology studies supports this practice. [12][13]14

Pre‑medication and Adjuncts

• Antisialagogue – Administer atropine 0.01 mg/kg (minimum 0.1 mg, maximum 0.5 mg) prior to ketamine to reduce hypersalivation. (Pediatric emergency medicine guideline) 9
• Midazolam for emergence – A dose of midazolam 0.05 mg/kg (maximum 2 mg) is recommended to further reduce emergence reactions. (Pediatric emergency medicine guideline; observational data) [9][15]

Safety and Adverse Event Profile

• Laryngospasm – Occurs in ≈1.4 % of all pediatric cases, but the incidence rises to 8–14 % in preschool‑aged children undergoing endoscopic procedures. (Observational emergency‑medicine data) [10][11]
• Emesis – Reported in ≈6.7 % of children; the risk increases with age (odds ratio ≈ 1.25 per additional year). (Observational emergency‑medicine data) [11][15]
• Recovery agitation – Mild agitation is seen in ≈17.6 % of patients, with moderate‑severe agitation in ≈1.6 %; higher rates are linked to younger age and higher ASA physical status. (Observational emergency‑medicine data) [11][15]
• Contraindications – Ketamine should be avoided in children with elevated intracranial pressure, ischemic heart disease, or hypertension because of its sympathomimetic effects. (Gastroenterology expert recommendations) [12][13]

Monitoring and Post‑procedure Care

• Sedation assessment – Evaluate adequacy of sedation at 3–5 minutes after IV administration or 5–10 minutes after IM administration. (Pediatric emergency medicine guideline) 9
• Post‑administration observation – Continue monitoring vital signs and oxygen saturation for 60–110 minutes after ketamine dosing until discharge criteria are satisfied. (Emergency‑medicine observational data) [10][11]