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Arterial and venous blood sampling in pharmacokinetic studies: Azosemide in rabbits
Author(s) -
Lee Sun H.,
Shin Wan G.,
Lee Myung G.,
Kim Nak D.
Publication year - 1994
Publication title -
biopharmaceutics and drug disposition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 58
eISSN - 1099-081X
pISSN - 0142-2782
DOI - 10.1002/bdd.2510150405
Subject(s) - pharmacokinetics , volume of distribution , arterial blood , venous blood , bolus (digestion) , distribution volume , medicine , intravenous bolus , blood flow , anesthesia , pharmacology
The pharmacokinetics of azosemide were evaluated simultaneously using both arterial and venous plasma data in six rabbits after a rapid 5 s intravenous bolus dosing. Initial arterial to venous ratios at 5 s after injection were the highest with values of 81.1, 67.3, 58.7, 530, 2660, and 10.5 for rabbits 1–6, respectively. Both curves decayed, paralleling each other at the terminal phase, with the venous levels higher than the arterial levels by 15.3, 31.9, 34.1, 40.7, 30.5, and 16.5% for rabbits 1–6, respectively. An exponential term with a negative coefficient was used to account for the short and steep rising phase of venous plasma levels after injection. Detailed analysis showed significant differences in various pharmacokinetic parameters, such as initial volume of distribution, apparent volume of distribution at steady state, and mean residence time based on arterial or venous data. A plot of 1/ Q (urine flow rate) versus l/CL R (renal clearance) of azosemide yielded a straight line in six rabbits, indicating that the CL R of azosemide is urine flow dependent in rabbits.