A versatile, computer-controlled, closed-loop system for continuous infusion of muscle relaxants

Area of Science:

• Anesthesiology
• Biomedical Engineering
• Pharmacology

Background:

• Continuous infusion of muscle relaxants is crucial for maintaining adequate neuromuscular blockade during surgery.
• Existing computer-controlled systems lack flexibility in drug selection and precise feedback mechanisms.
• Optimizing neuromuscular blockade requires accurate monitoring and automated dose adjustment.

Purpose of the Study:

• To describe and evaluate a novel computer-controlled, closed-loop system for continuous infusion of muscle relaxants.
• To assess the system's ability to achieve and maintain target levels of neuromuscular blockade using atracurium besylate or vecuronium bromide.
• To compare the system's performance with previously described automated anesthesia delivery methods.

Main Methods:

• Development of a closed-loop control system with operator selection of atracurium besylate or vecuronium bromide.
• Integration of monitoring to provide feedback on neuromuscular blockade levels.
• Clinical testing in 36 patients (ASA physical status 1 or 2) undergoing elective surgery.
• Evaluation of the control algorithm's ability to induce and maintain target blockade levels.

Main Results:

• The system successfully induced target neuromuscular blockade levels rapidly in all patients.
• Precise maintenance of blockade at steady state with minimal oscillations was achieved.
• The system demonstrated flexibility by allowing the choice between two different muscle relaxants.

Conclusions:

• The described automatic feedback control system effectively induces and precisely maintains predetermined neuromuscular blockade levels.
• This system offers enhanced control and flexibility for continuous muscle relaxant infusion in anesthesia.
• The technology represents a significant advancement in computer-assisted anesthesia delivery.