Interference of hawthorn on serum digoxin measurements by immunoassays and pharmacodynamic interaction with digoxin - PubMed (original) (raw)

. 2010 Aug;134(8):1188-92.

doi: 10.5858/2009-0404-OA.1.

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• PMID: 20670141
• DOI: 10.5858/2009-0404-OA.1

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Interference of hawthorn on serum digoxin measurements by immunoassays and pharmacodynamic interaction with digoxin

Amitava Dasgupta et al. Arch Pathol Lab Med. 2010 Aug.

Free article

Abstract

Context: Hawthorn is an herb indicated for treating cardiac illness. Because a patient taking digoxin may also take hawthorn, we investigated potential interference of hawthorn in serum digoxin measurements using immunoassays as well as pharmacodynamic interaction between hawthorn and digoxin. Hawthorn contains alkaloids that are structurally similar to digoxin and may interfere with serum digoxin measurement using immunoassays. In addition, hawthorn has cardioactive properties similar to digoxin.

Objective: To study potential pharmacodynamic interaction between hawthorn and digoxin.

Design: The effects of hawthorn extract on serum digoxin measurements using Digoxin III (Abbott Laboratories, Abbott Park, Illinois) and the Tina-Quant digoxin assay (Roche Diagnostics, Indianapolis, Indiana) were investigated using 2 different brands of extract. To study the pharmacodynamic interaction between hawthorn and digoxin, we used an isolated adult rat cardiomyocyte system, measuring calcium transients by real-time fluorescence spectrophotometry.

Results: Hawthorn interfered only with the Digoxin III immunoassay but had no effect on the Tina-Quant assay. Both hawthorn extracts increased intracellular calcium levels, but the lack of additive response with digoxin suggests both may bind to the same site of Na, K adenosine triphosphatase.

Conclusion: Because of interference of hawthorn with a digoxin immunoassay and pharmacodynamic interaction with digoxin, a patient receiving digoxin should avoid hawthorn.

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