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A Journal on Anesthesiology, Resuscitation, Analgesia and Intensive Care
Minerva Anestesiologica 2013 November;79(11):1238-47
Influence of acute normovolemic hemodilution on the pharmacokinetics of Cisatracurium Besylate
Dahaba A. A. 1, Suljevic I. 2, Oettl K. 3, Xiao Z. 4, Dong H. 4, Xiong L. 4, Reibnegger G. 3 ✉
1 Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, Graz, Austria;
2 Department of Anesthesiology, Sarajevo University Clinical Centre, Sarajevo, Bosnia Herzegovina;
3 Department of Physiological Chemistry, Medical University of Graz, Graz, Austria;
4 Department of Anesthesiology, Xijing First Affiliated Hospital of Fourth Military Medical University, Xi’an, Shaanxi, People’s Republic of China
Background: Acute normovolemic hemodilution (ANH) is an efficacious blood conservation strategy for avoiding or reducing allogeneic blood transfusion. In a previous publication, on a different cohort of patients, we demonstrated that cisatracurium’s potency and duration of action were not influenced by ANH, but we could not establish which role, if any, pharmacokinetics played.
Methods: Forty patients were randomly allocated to the ANH or control groups. Patients received cisatracurium single 100 µg kg-1 bolus dose, serial arterial blood samples were collected and assayed for pharmacokinetic analysis.
Results: Central and steady state apparent volumes of distribution (V1, Vdss) and slope factor (γ) were larger, effect-compartment concentration at 50% neuromuscular block was lower in the ANH (90.8±41.6 mL kg-1, 159.1±39.2 mL kg-1, 6.0±0.9 and 136.4±29.1 ng·mL-1) compared with the control group (65.5±26.1 mL kg-1, 134.8±31.8 mL kg-1, 5.5±0.8 and 158.5±26.0 ng·mL-1) respectively. Elimination half-life (t1/2 β) and mean residence time (MRT) were longer in the ANH (37.2±20.9, 23.5±13.2 min) than the control group (26.8±9.8, 16.9±6.2 min), albeit not statistically significant (P=0.051, P=0.051). There were no significant differences in distribution half-life (t1/2 α), effect-compartment equilibration rate-constant (keo), central and total clearances (Clc, Cl) between the ANH (2.4±1.2 min, 0.070±0.013 min-1, 6.1±1.9 mL kg-1 min-1 and 7.7±2.3 mL kg-1 min-1) and control group (1.9±1.2 min, 0.063±0.008 min-1, 7.0±1.8 mL kg-1 min-1 and 8.5±2.1 mL kg-1 min-1) respectively.
Conclusion: ANH altered some pharmacokinetic parameters such as significantly larger volumes of distribution. Other parameters such as elimination half-life were considerably longer albeit not statistically significant.