Alcuronium kinetics and plasma concentration-effect relationship.

Area of Science:

• Pharmacology
• Anesthesiology
• Clinical Pharmacokinetics

Background:

• Neuromuscular blockers are crucial in anesthesia.
• Understanding alcuronium's pharmacokinetic and pharmacodynamic profile is essential for safe and effective use.

Purpose of the Study:

• To investigate the pharmacokinetics and pharmacodynamics of alcuronium in surgical patients.
• To characterize the concentration-effect relationship of alcuronium.

Main Methods:

• 12 surgical patients received alcuronium via bolus and infusion regimens.
• Plasma concentrations and neuromuscular response data were collected.
• Mathematical models were used to analyze concentration-effect relationships.

Main Results:

• Alcuronium kinetic parameters were consistent across different administration regimens and patient groups.
• A dynamic model with a separate effect compartment best described the concentration-effect relationship.
• The rate constant for equilibration was 0.24 +/- 0.11 min-1.
• The steady-state concentration for 95% paralysis was determined to be 0.91 +/- 0.35 micrograms/ml.

Conclusions:

• Alcuronium exhibits predictable pharmacokinetics and pharmacodynamics in surgical patients.
• A dynamic model accurately represents the relationship between alcuronium concentration and neuromuscular effect.
• The determined steady-state concentration provides a valuable reference for clinical dosing.