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Related Experiment Videos

Assessment of residual curarization using low-current stimulation.

S J Brull1, J Ehrenwerth, N R Connelly

  • 1Department of Anesthesiology, Yale University School of Medicine, Yale-New Haven Hospital, New Haven, CT 06510.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|March 1, 1991
PubMed
Summary

Residual neuromuscular blockade is common after anesthesia with long-acting muscle relaxants, even with intraoperative monitoring. Train-of-four (TOF) stimulation at 20 mA detected significant residual curarization in patients receiving vecuronium or pancuronium.

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Area of Science:

  • Anesthesiology
  • Pharmacology
  • Critical Care Medicine

Background:

  • Residual neuromuscular blockade (RNB) is a common complication following the administration of neuromuscular blocking agents (NMBAs) during general anesthesia.
  • It can lead to adverse respiratory events and prolonged recovery in the Post Anesthesia Care Unit (PACU).
  • Qualitative assessments of neuromuscular function intraoperatively may not accurately predict the absence of RNB.

Purpose of the Study:

  • To determine the incidence and degree of residual neuromuscular blockade in PACU patients.
  • To evaluate the effectiveness of train-of-four (TOF) stimulation at a low current (20 mA) in detecting RNB.
  • To compare the incidence of RNB after administration of vecuronium versus pancuronium.

Main Methods:

Related Experiment Videos

  • A prospective study involving 64 PACU patients randomly assigned to three groups: Control (no NMBA), Vecuronium (V), and Pancuronium (P).
  • TOF stimulation at 20 mA was used to assess neuromuscular function 15 minutes after surgery.
  • Patients were considered to have adequate neuromuscular function intraoperatively based on clinical signs and tactile/visual evaluation.

    • Main Results:

    • A significant incidence of residual neuromuscular blockade was detected: 45% in the Pancuronium group (TOF ratio < 0.70) and 8% in the Vecuronium group.
    • No residual blockade was observed in the control group.
    • The findings were consistent with previous studies using supramaximal TOF stimulation.

    Conclusions:

    • Residual neuromuscular blockade is frequently encountered after the use of long-acting nondepolarizing muscle relaxants, despite intraoperative monitoring.
    • TOF stimulation at a low current of 20 mA is effective in detecting residual curarization.
    • Enhanced vigilance and quantitative monitoring are necessary to mitigate the risks associated with RNB.