• Samia Ezzine, Nobuharu Yamaguchi, and France Varin.
• Faculté de Pharmacie, Université de Montréal, 2900 Edouard Montpetit, CP 6128, succursale Centre-ville, Montreal, Quebec, Canada H3C 3 J7.
• J Pharmacol Toxicol Methods. 2004 Mar 1; 49 (2): 121-9.

IntroductionThe objective was to establish and validate a microdialysis technique for the quantification of interstitial concentrations of the neuromuscular blocker, rocuronium, in the muscle tissue of dogs under steady-state conditions.MethodsThe standard and combined retrodialysis approaches were used for in vivo microdialysis probe calibration. After induction of anesthesia with pentobarbital (30 mg/kg), the left femoral vein was cannulated and blood drawn for protein binding determination. Microdialysis probes were inserted in the muscle and calibrated in vivo, using vecuronium as the calibrator. Each dog received a short 2-min infusion followed by a 120-min infusion of rocuronium via the right jugular vein and three microdialysis samples were collected at steady-state during a 2-h period. Samples were stored at -70 degrees C until HPLC analysis.ResultsUsing combined retrodialysis, rocuronium unbound interstitial (C(ISFu)) and venous plasma (C(pssuv)) concentrations are in good agreement; with a ratio C(ISFu)/C(pssuv) of 100+/-11%. Using standard retrodialysis, this ratio was 47+/-7%.ConclusionsCombined retrodialysis is a more reliable and accurate technique for quantitative assessment of rocuronium interstitial concentrations especially for lengthy anesthetic procedures. These findings have potential implications, as drug concentrations in the site of action would be more relevant for concentration-effect relation of muscle relaxants.

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