Clinical automatic control of neuromuscular blockade

Area of Science:

• Anesthesiology
• Biomedical Engineering
• Pharmacology

Background:

• Neuromuscular blockade is crucial in anaesthesia for surgical procedures.
• Manual titration of neuromuscular blocking agents can be challenging.
• Automated delivery systems offer potential for improved control and patient safety.

Purpose of the Study:

• To evaluate a simple feedback control technique for automatic pancuronium delivery in anaesthetised patients.
• To assess the controller's ability to maintain a target level of neuromuscular blockade.
• To identify practical challenges associated with the automated system.

Main Methods:

• A feedback control system was developed to automatically deliver pancuronium.
• Dosage rates were adjusted every 10 seconds based on electromyogram (EMG) measurements.
• The system was tested in 40 anaesthetised surgical patients aiming for 80% blockade.

Main Results:

• The controller successfully maintained a mean neuromuscular blockade level of 72.9% when set to demand 80%.
• Pancuronium consumption averaged 0.47 microgram/kg/minute.
• Key practical issues included managing electrical noise and equipment setup time.

Conclusions:

• A simple feedback control technique can effectively automate pancuronium delivery for neuromuscular blockade.
• The system demonstrates potential for stable and controlled anaesthesia.
• Further development is needed to address practical clinical challenges like electrical interference and setup efficiency.