title: False-positive digoxin measurements due to conjugated metabolite accumulation in combined renal and hepatic dysfunction.
abstract: A 41-year-old man with combined renal and hepatic dysfunction was noted to have marked elevations in serum digoxin concentration subsequent to the discontinuation of digoxin therapy. These elevations (peak value 8.6 ng/ml), as measured by both radioimmunoassay and fluorescence polarization immunoassay, were not associated with electrocardiographic evidence of digitalis toxicity. Using a combined high-performance liquid chromatography/radioimmunoassay, accumulation and immunoassay cross-reactivity of conjugates of digoxigenin monodigitoxoside (cardioinactive metabolites of digoxin) were found to be the basis of the observed false elevation in digoxin concentration.
authors.affiliation: Jefferson Medical College, Philadelphia, Pa.
authors.forename: P H
authors.initials: PH
authors.lastname: Vlasses
authors.forename: A
authors.initials: A
authors.lastname: Besarab
authors.forename: S R
authors.initials: SR
authors.lastname: Lottes
authors.forename: D P
authors.initials: DP
authors.lastname: Conner
authors.forename: P J
authors.initials: PJ
authors.lastname: Green
authors.forename: M H
authors.initials: MH
authors.lastname: Gault
mesh_terms: D058186:Acute Kidney Injury / Q000097:blood / Q000628:therapy; D000328:Adult; D002543:Cerebral Hemorrhage / Q000097:blood / Q000150:complications / Q000628:therapy*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003429:Cross Reactions; D003922:Diabetes Mellitus, Type 1 / Q000097:blood; D004077:Digoxin / Q000097:blood*; D005189:False Positive Reactions; D005455:Fluorescent Antibody Technique; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000188:drug therapy; D007118:Immunoassay / Q000379:methods; D008107:Liver Diseases / Q000097:blood; D008297:Male; D011863:Radioimmunoassay / Q000379:methods; D006435:Renal Dialysis
chemical_list: D004077:Digoxin