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Postoperative neuromuscular function in pediatric day-care patients
M R Baxter1, J C Bevan, J Samuel
1Department of Anesthesia, Montreal Children's Hospital, Quebec, Canada.
Insights
Pediatric patients over 2 years old rarely experience residual paralysis after anesthesia with pancuronium, atracurium, or vecuronium. This suggests these muscle relaxants are safe for day-care surgery in children, ensuring full recovery.
Area of Science:
- Anesthesiology
- Pediatric Anesthesia
- Neuromuscular Pharmacology
Background:
- Adults often experience residual paralysis after anesthesia with nondepolarizing muscle relaxants.
- The incidence of residual paralysis in pediatric patients is not well-established.
- Day-care surgery in children necessitates a thorough understanding of neuromuscular recovery.
Purpose of the Study:
- To investigate the extent of neuromuscular transmission recovery in pediatric patients after anesthesia.
- To compare the recovery profiles of pancuronium, atracurium, and vecuronium in children.
- To assess the likelihood of postoperative muscle weakness or respiratory impairment in pediatric surgical patients.
Main Methods:
- A study involving 91 pediatric patients (aged 0-10 years) undergoing day-care surgery.
- Administration of halothane anesthesia with pancuronium, atracurium, or vecuronium.
- Assessment of neuromuscular blockade using peripheral nerve stimulation and train-of-four (TOF) ratio measurement in the recovery room.
Main Results:
- Neuromuscular blockade recovery was nearly complete across all three drug groups (pancuronium, atracurium, vecuronium).
- The train-of-four ratio was high and similar in all groups: pancuronium (96.7%), atracurium (95.5%), and vecuronium (96.3%).
- No significant differences were observed in patient ages or recovery times among the groups.
Conclusions:
- Postoperative residual paralysis is unlikely in pediatric day-care surgical patients over 2 years old.
- Pancuronium, atracurium, and vecuronium appear to provide safe and effective neuromuscular blockade with complete recovery in this population.
- These findings support the use of these anesthetic techniques for pediatric day-care surgery, minimizing risks of muscle weakness and respiratory issues.
Abstract:
After anesthesia employing nondepolarizing muscle relaxants, 30%-40% of adult patients demonstrate residual paralysis with a train-of-four ratio less than 70%, but it is not known if the same is true for children. This study was designed to investigate neuromuscular transmission in 91 ASA physical status I or II day-care children (aged 0-10 yr) after halothane anesthesia in which pancuronium (n = 34), atracurium (n = 32), or vecuronium (n = 25) was administered. Peripheral nerve stimulation was used clinically to assess neuromuscular blockade during surgery. In the recovery room, the evoked response of the adductor pollicis muscle was measured by train-of-four stimulation of the ulnar nerve. This measurement was made (mean +/- SEM) at 18.0 +/- 1.5, 15.0 +/- 1.3, and 15.0 +/- 1.7 min after pharmacologic antagonism with 0.02 mg/kg atropine and 0.06 mg/kg neostigmine in the pancuronium, atracurium, and vecuronium groups, respectively. There were no differences in the ages of the patients in the three groups at 4.3 +/- 0.4, 4.0 +/- 0.4, and 5.0 +/- 0.5 yr, with 17 children less than 2 yr. Recovery from neuromuscular blockade in all three groups was almost complete. The train-of-four ratio (height of fourth twitch compared with the first) was similar in patients who had received pancuronium (96.7% +/- 0.9%), atracurium (95.5% +/- 0.9%), or vecuronium (96.3% +/- 1.3%). Therefore, postoperative muscle weakness or respiratory impairment is unlikely in pediatric day-care surgical patients more than 2 yr old when these anesthetic techniques are used.