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  • Title: Clearance of atracurium and laudanosine in the urine and by continuous venovenous haemofiltration.
    Author: Shearer ES, O'Sullivan EP, Hunter JM.
    Journal: Br J Anaesth; 1991 Nov; 67(5):569-73. PubMed ID: 1751271.
    Abstract:
    We have measured the steady state urinary clearances of atracurium, given by constant infusion, and laudanosine in eight patients undergoing artificial ventilation; all had normal renal function (mean creatinine clearance 81 ml min-1). Mean (SD) urinary clearance of atracurium was 0.55 (0.5) ml kg-1 min-1; that of laudanosine was 0.33 (0.2) ml kg-1 min-1. Simultaneous plasma clearances were 7.1 (1.4) ml kg-1 min-1 and 3.8 (1.5) ml kg-1 min-1, respectively. Notional haemofiltration clearances of the two substances were measured also in seven critically ill patients with renal and respiratory failure undergoing continuous venovenous haemofiltration. Mean (SD) clearances of atracurium and laudanosine in the haemofiltrate fluid were 0.11 (0.06) ml kg-1 min-1 and 0.09 (0.02) ml kg-1 min-1, respectively whilst plasma clearances were atracurium 6.7 (1.8) ml kg-1 min-1 and laudanosine 4.5 (1.8) ml kg-1 min-1. There were no significant differences between the plasma clearances of the drugs in the two groups, despite the difference in severity of sickness. Urinary clearance rates of atracurium and laudanosine were approximately 8 and 9% of that in the plasma, but the haemofiltration clearance of both substances was only 2%.
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