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Respiratory depression after low-dose caudal morphine
H W Karl1, D C Tyler, E J Krane
1University of Washington, Department of Anaesthesiology, Seattle, USA.
Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|October 1, 1996
Summary
Postoperative respiratory depression can occur in children over one year old, even with small doses of caudal morphine. Lethargy and decreased oxygen saturation are key warning signs requiring prompt intervention.
Area of Science:
- Pediatric Anesthesiology
- Pain Management
- Pharmacovigilance
Background:
- Caudal analgesia is common in pediatric surgery.
- Morphine is frequently used for postoperative pain relief.
- Understanding potential adverse events is crucial for patient safety.
Observation:
- A 15-month-old child received a small dose of caudal morphine (0.04 mg/kg) after ureteral reimplantation.
- Two hours post-administration, the child developed lethargy and severe hypoxemia (oxygen saturation 62%).
- Respiratory rate remained normal, highlighting the importance of pulse oximetry.
Findings:
- The patient required intravenous naloxone and an 11-hour continuous infusion for respiratory depression.
- This case demonstrates that significant respiratory depression can occur in children over one year of age with low-dose caudal morphine.
- Lethargy and decreased oxygen saturation were early indicators of respiratory compromise.
Implications:
- Clinicians should be vigilant for respiratory depression in young children receiving caudal morphine, regardless of dose.
- Pulse oximetry is superior to respiratory rate monitoring for detecting hypoxemia in this setting.
- This case underscores the need for careful patient monitoring and prompt reversal of opioid-induced respiratory depression.