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Metocurine requirements and plasma concentrations in burned paediatric patients
Insights
Burned children need significantly more metocurine for neuromuscular blockade due to changes at the neuromuscular junction. Recovery time was similar despite the increased dose required for burned pediatric patients.
Area of Science:
- Anesthesiology
- Pediatric Medicine
- Pharmacology
Background:
- Neuromuscular blocking agents are essential in pediatric anesthesia.
- Burn injuries can alter drug pharmacokinetics and pharmacodynamics.
- Understanding these alterations is crucial for safe anesthetic management.
Purpose of the Study:
- To investigate the dose-response relationship of metocurine in burned versus non-burned children.
- To compare the required plasma concentrations and recovery times for metocurine between the two groups.
Main Methods:
- A cumulative dose-response study was conducted on 22 children (11 burned, 11 non-burned).
- Anesthesia was maintained with thiopentone, nitrous oxide in oxygen, and narcotics.
- Neuromuscular blockade was assessed by monitoring twitch response.
Main Results:
- Burned children required a three-fold greater dose of metocurine for equivalent neuromuscular blockade (P < 0.001).
- Burned children needed twice the plasma concentration of metocurine for the same twitch depression.
- No significant difference in recovery time was observed between groups despite dose variations.
Conclusions:
- Burned children exhibit resistance to non-depolarizing neuromuscular blockers like metocurine.
- Fundamental changes at the neuromuscular junction in burned children may explain this resistance.
- Further research is warranted to elucidate the mechanisms underlying this altered response.
Abstract:
A cumulative dose-response study for metocurine was performed on 11 burned and 11 non-burned children during thiopentone, nitrous oxide in oxygen and narcotic anaesthesia. Burned children required a significantly (P less than 0.001) greater dose (three-fold) of metocurine to achieve a given degree of neuromuscular blockade compared with non-burned children. For the same degree of twitch depression, burned children required twice the plasma concentration of metocurine. Despite the larger dose, the recovery time for the twitch was not significantly different in the two groups. It is speculated that there may be fundamental changes at the neuromuscular junction of burned children to account for their resistance to the effect of non-depolarizing neuromuscular blockers.