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Age-related differences in the use of morphine, diazepam, and pancuronium for mechanically ventilated children
J J Mickell1, S A Pedigo, S E Lucking
1Department of Pediatrics, Virginia Commonwealth University, Medical College of Virginia, Children's Medical Center, Richmond.
Insights
Mechanically ventilated children require sedation and paralysis. Infants aged 4-18 months received twice the median daily dosage of morphine, diazepam, and pancuronium compared to younger or older children.
Area of Science:
- Pediatric critical care medicine
- Pharmacology
- Mechanical ventilation
Background:
- Mechanically ventilated children often require sedation and paralysis.
- Commonly used agents include morphine (M), diazepam (D), and pancuronium (P).
- Understanding age-related dosage variations is crucial for optimizing patient care.
Purpose of the Study:
- To investigate the relationship between patient age and the daily dosage of morphine, diazepam, and pancuronium (MDP) in mechanically ventilated children.
- To identify potential age-specific patterns in sedative and paralytic medication use.
Main Methods:
- Retrospective analysis of 36 mechanically ventilated children, excluding those with confounding neurological, hemodynamic, or painful conditions.
- Patients were categorized into three age groups: A (<4 months), B (4-18 months), and C (>18 months).
- Daily total dosages of MDP were calculated and analyzed across the study days (326 total).
Main Results:
- The median daily drug usage in group B (4-18 months) was 2.3 mg/kg/day.
- This dosage was double that observed in group A (<4 months) and group C (>18 months) (p < 0.001).
- Significant differences in MDP dosage were noted between the age groups.
Conclusions:
- Infants aged 4-18 months require significantly higher daily dosages of morphine, diazepam, and pancuronium compared to younger or older children.
- Developmental changes in physiology, pharmacology, and behavior may explain these age-related variations.
- Potential factors include paradoxical drug effects or multiple drug antagonism, warranting further investigation.
Abstract:
Mechanically ventilated children usually require a combination of sedation (morphine = M, diazepam = D) and paralysis (pancuronium = P) to minimize anxiety, discomfort, and the risks of self-extubation, tracheal injury, and pulmonary barotrauma. We sought to determine whether our use of MDP varied with patient age. Cases where the dosage of MDP would be influenced by neurological, hemodynamic, or painful diagnoses were excluded. The 36 cases selected were divided according to age into three groups (less than 4 months = A, 4-18 months = B, greater than 18 months = C). The daily sum of MDP dosages was calculated for each of the 326 study days, a mean of 9 study days for each case. The median daily drug usage in group B (2.3 mg/kg/day) was twice that in either group A (younger) or group C (older) (both p less than 0.001). This finding may be explained by developmental changes in physiology, pharmacology, and behavior, and may have been influenced by a paradoxical drug effect or multiple drug antagonism.