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Saliva and plasma levels and plasma protein binding of clofibrinic acid in uremic patients
Author(s) -
Bjornsson Thorir D,
Meffin Peter J,
Peters Flora A,
Blaschke Terrence F
Publication year - 1980
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1980.36
Subject(s) - hemodialysis , saliva , dialysis , plasma concentration , free fraction , medicine , drug , plasma levels , chemistry , plasma protein binding , gastroenterology , endocrinology , pharmacology
Clofibrinic acid in saliva and plasma and its plasma protein binding were determined in 18 patients with renal impairment after a single 2‐gm dose of clofibrate. A weak but significant correlation (r 2 = 0.378; p < 0.02) between free plasma and saliva levels of clofibrinic acid was found. The free fraction of clofibrinic acid in plasma is higher (p < 0.02) in long‐term hemodialysis patients (0.0915 ± 0.0141) than in nondialysis patients (0.0715 ± 0.0143). During dialysis, 2 hemodialysis patients had a free fraction more than twice as high (mean, 0.2083) as that in the other hemodialysis patients who were studied on interdialysis days. These observations suggest that saliva pH determinations are essential for optimal interpretation of saliva to plasma level ratios of weakly acidic drugs and that, during hemodialysis, patients may temporarily be exposed to increased risks of drug toxicity due to rises in free concentrations of drugs. Clinical Pharmacology and Therapeutics (1980) 27 , 230–235; doi: 10.1038/clpt.1980.36