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Pipecuronium revisited: dose-response and maintenance requirement in infants, children, and adults
1Department of Anesthesiology, Children's Hospital University of Helsinki, Finland.
Insights
Children require a higher initial dose of pipecuronium compared to infants and adults. Maintenance doses of pipecuronium are consistent across all age groups studied, reflecting drug potency.
Area of Science:
- Anesthesiology
- Pharmacology
- Pediatric Critical Care
Background:
- Neuromuscular blocking agents are crucial for surgical procedures.
- Understanding age-specific dosing of pipecuronium is essential for safe anesthesia.
- Pipecuronium bromide is a non-depolarizing neuromuscular blocker used in anesthesia.
Purpose of the Study:
- To compare the dose-response relationship of pipecuronium in infants, children, and adults.
- To determine the maintenance requirements of pipecuronium across different pediatric and adult age groups.
- To evaluate the impact of age on pipecuronium's neuromuscular blocking effects.
Main Methods:
- Prospective study involving 45 patients (15 infants, 15 children, 15 adults) of ASA physical status I and II.
- Neuromuscular function monitored via electromyography with train-of-four stimulation.
- Cumulative log-probit dose-response curves established to determine ED95, followed by maintenance dose assessment.
Main Results:
- Dose-response curves for pipecuronium were parallel across age groups.
- The effective dose 95% (ED95) was similar in infants and adults (40-42 µg/kg) but higher in children (52 µg/kg).
- Maintenance requirements were consistent at 0.6–0.7 ED95 per hour to sustain neuromuscular block.
Conclusions:
- Children exhibit the greatest bolus dose requirement for pipecuronium.
- Maintenance requirements for pipecuronium are directly related to its potency within each studied age group.
- Findings suggest age-specific titration strategies for pipecuronium may be beneficial.
Study Objective:
To compare dose-response relationship and maintenance requirement of pipecuronium in anesthetized infants, children, and adults.
Design:
Prospective, consecutive sample trial.
Setting:
Operating room at a university hospital.
Patients:
15 infants (1-11 months), 15 children (3-10 years), and 15 adults (35-50 years) of ASA physical status I and II.
Interventions:
Anesthesia was induced and maintained with N2O:O2 2:1 and 1 minimum alveolar concentration end-tidal halothane. The neuromuscular function was recorded by adductor pollicis electromyogram evoked by a train-of-four ulnar nerve stimulation at 20 second intervals. An individual cumulative log-probit dose-response curve was established and maintenance requirement of pipecuronium determined. Between-group comparisons were made by analysis of variance and Scheffe F-test.
Measurements And Main Results:
Dose-response curves were parallel with a dose-requirement of pipecuronium similar in infants and adults (ED95 of 40-42 micrograms/kg) and greater in children (ED95 of 52 micrograms/kg). After 30 minutes of surgical neuromuscular block, pipecuronium was required in each age group at a rate of 0.6 to 0.7 individual ED95 doses per hour to maintain an 85% to 95% neuromuscular block.
Conclusions:
Bolus dose requirement of pipecuronium is greatest in children. Maintenance requirement is related to potency in each age group studied.