Gallamine administered by combined bolus and infusion

Area of Science:

• Anesthesiology
• Pharmacology
• Clinical Pharmacy

Background:

• Continuous neuromuscular blockade is essential for surgical procedures.
• Gallamine is a neuromuscular blocking agent used in anesthesia.
• Optimizing gallamine administration requires understanding its pharmacokinetics.

Purpose of the Study:

• To develop and evaluate a continuous intravenous infusion regimen of gallamine combined with a bolus dose.
• To achieve sustained muscle relaxation during surgery based on gallamine pharmacokinetics.
• To analyze the pharmacokinetic profile of gallamine in elderly surgical patients.

Main Methods:

• A combined intravenous bolus (2.5 mg/kg) and infusion (0.8 mg/kg/hr) regimen of gallamine was administered to 11 patients.
• Serum gallamine concentrations were monitored over time.
• Pharmacokinetic analysis was performed using a three-compartment model.
• Paralysis intensity was assessed at the cessation of the infusion.

Main Results:

• The regimen successfully produced continuous relaxation in 10 of 11 patients.
• A mean serum gallamine concentration of 11.8 microgram/ml correlated with 92% paralysis intensity upon infusion cessation.
• The elimination half-life in this cohort (50-76 years old) averaged 247 minutes, significantly longer than previously reported values (128-141 minutes).

Conclusions:

• The developed gallamine regimen provides effective continuous neuromuscular blockade for surgery.
• The prolonged elimination half-life in elderly patients highlights the need for adjusted dosing strategies.
• This pharmacokinetic approach offers a basis for optimizing gallamine use in specific patient populations.