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CORRELATION BETWEEN PREDICTED AND MEASURED DIGOXIN SERUM CONCENTRATIONS
Author(s) -
Tayeb O. S.,
AlFares A. M.,
ElSayed Y. M.,
Islam S. I.
Publication year - 1988
Publication title -
journal of clinical pharmacy and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.622
H-Index - 73
eISSN - 1365-2710
pISSN - 0269-4727
DOI - 10.1111/j.1365-2710.1988.tb00173.x
Subject(s) - digoxin , fluorescence polarization immunoassay , creatinine , renal function , pharmacokinetics , chemistry , therapeutic drug monitoring , correlation coefficient , linear regression , serum concentration , endocrinology , urology , medicine , chromatography , heart failure , mathematics , statistics
Summary Measurement of digoxin serum concentration can be useful as a direct guide to the dose appropriate to individual patients. Therefore, we have attempted to predict digoxin serum concentration in 62 patients with a wide range of body weight, age and renal function, using creatinine clearance and individual digoxin dose. Creatinine clearance in each patient was determined by the Cockroft and Gault method (1). Digoxin clearance was determined by Scheiner's method (2). Once digoxin clearance was determined, the predicted steady‐state serum concentration was calculated using general pharmacokinetic principles. Each patient was on digoxin therapy for at least 1 month. Digoxin serum concentration was measured by the newly developed fluorescence polarization immunoassay (FPIA). A linear regression analysis was performed on the data from the predicted and measured serum level which yielded a slope of 0·9463 intercept of 0·0950 and a correlation coefficient ( r ) of 0·9600. The method was found to be very useful to predict digoxin serum levels in overdosed and underdosed patients.