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Relationship between age and spontaneous ventilation during intravenous anesthesia in children

Nigel Barker1, Joanne Lim, Erica Amari

  • 1Department of Anesthesiology, Pharmacology & Therapeutics, The University of British Columbia, Vancouver, BC, Canada.

Paediatric Anaesthesia
|September 5, 2007
PubMed

Insights

Younger children, particularly those under 3, tolerate higher doses of remifentanil during total intravenous anesthesia (TIVA) while maintaining spontaneous ventilation. This study provides guidelines for safe anesthetic practices in pediatric patients.

Area of Science:

  • Anesthesiology
  • Pediatric Anesthesia
  • Pharmacology

Background:

  • Maintaining spontaneous ventilation during anesthesia is crucial for pediatric patients, especially during procedures like airway endoscopy.
  • Total intravenous anesthesia (TIVA) with propofol and remifentanil is a common technique for achieving this.
  • Age-specific dosing of anesthetic agents is essential for patient safety and efficacy.

Purpose of the Study:

  • To evaluate how age affects the tolerated dose of remifentanil in children undergoing TIVA with spontaneous ventilation.
  • To establish guidelines for administering propofol and remifentanil to maintain spontaneous breathing in pediatric patients.
  • To determine the remifentanil dose associated with respiratory rate depression (RD50) across different pediatric age groups.

Main Methods:

  • Forty-five children were divided into three age groups (6 months-3 years, 3-6 years, 6-9 years) for strabismus surgery.
  • Propofol infusion was titrated using State Entropy; remifentanil was administered using a modified up-and-down method.
  • The final remifentanil infusion rate was determined by maintaining a respiratory rate just above 10 breaths/min for 10 minutes.

Main Results:

  • The remifentanil dose tolerated (RD50) was significantly higher in children younger than 3 years (0.192 µg/kg/min) compared to older children (0.095 µg/kg/min and 0.075 µg/kg/min).
  • No linear relationship was found between the remifentanil dose and patient age, weight, or height.
  • Younger children demonstrated a greater tolerance for remifentanil while preserving spontaneous respiration.

Conclusions:

  • Children under 3 years tolerate higher remifentanil doses during TIVA with spontaneous ventilation compared to older children.
  • TIVA with spontaneous ventilation is safely achievable in infants and younger children.
  • These findings aid in optimizing anesthetic management for pediatric patients requiring spontaneous ventilation.
Abstract

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