Closed-loop administration of atracurium. Steady-state neuromuscular blockade during surgery using a computer...

The advent of newer muscle relaxants with predictable rates of metabolism and times of offset of neuromuscular blockade now makes it possible to use intravenous infusion safely as a mode of delivery. This has many advantages over administration by intermittent bolus. Moreover, it is feasible to use a servo system for their delivery. We have developed and evaluated such a system which is portable and requires little computer expertise to set up and use. It is a useful adjunct to routine anaesthesia, as well as a potentially powerful research tool.