Infusion of vecuronium controlled by a closed-loop system

Area of Science:

• Anesthesiology
• Pharmacology
• Critical Care Medicine

Background:

• Neuromuscular blockade is crucial for surgical procedures and mechanical ventilation.
• Maintaining optimal neuromuscular blockade depth is challenging with traditional methods.
• Vecuronium is a commonly used non-depolarizing neuromuscular blocking agent.

Purpose of the Study:

• To describe a closed-loop control system for neuromuscular blockade using semi-continuous vecuronium infusion.
• To evaluate the efficacy and safety of this automated control method.
• To compare vecuronium requirements with historical data from bolus injections.

Main Methods:

• A semi-continuous infusion of vecuronium was employed in 28 patients.
• Closed-loop control aimed to maintain neuromuscular transmission between 13% and 17% of baseline.
• Vecuronium dosage was adjusted automatically based on real-time monitoring.

Main Results:

• The system successfully maintained average neuromuscular transmission within the target range (13-17% of control).
• Average vecuronium requirement was 1.1 µg/kg/min (range: 0.8-1.5 µg/kg/min), comparable to bolus injection methods.
• No adverse side effects were observed during the infusion.
• Rapid recovery of neuromuscular function occurred after stopping the infusion.

Conclusions:

• Closed-loop controlled semi-continuous infusion of vecuronium provides effective and safe neuromuscular blockade.
• This automated method achieves stable blockade levels with comparable drug requirements to intermittent boluses.
• The system facilitates prompt patient recovery, reducing the need for pharmacologic reversal.