Bidirectional (Negative/Positive) Interference of Oleandrin and Oleander Extract on a Relatively New LOCI Digoxin Assay Using Vista 1500 Analyzer. Issue 1 (27th December 2013)

• Record Type: Journal Article
• Authors: Dasgupta, Amitava; Welsh, Kerry J.; Hwang, Shen‐An; Johnson, Myrtle; Actor, Jeffrey K.
• Is Part Of: Journal of clinical laboratory analysis. Volume 28:Issue 1(2014:Jan.)
• Page Start: 16
• Page End: 20
• Publication Date: 2013-12-27
• Subjects: Diagnosis, Laboratory -- Periodicals; Medical laboratory technology -- Periodicals; 616
• DOI: 10.1002/jcla.21637
• Languages: English
• ISSNs: 0887-8013

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="jcla21637-sec-0010" sec-type="section"> <title>Background</title> <p>Oleander interferes with serum digoxin measurements using various immunoassays. The potential interference of oleander and its active ingredient, oleandrin, with a relatively new homogenous sequential chemiluminescent digoxin assay based on luminescent oxygen channeling technology (LOCI digoxin assay, Siemens Diagnostics) has not been previously reported.</p> </sec> <sec id="jcla21637-sec-0020" sec-type="section"> <title>Methods</title> <p>Aliquots of a digoxin‐free serum pool were supplemented with increasing concentrations of oleandrin, or with oleander extract, followed by measuring the apparent digoxin concentrations using the LOCI digoxin assay using Vista 1500 analyzer. Mice were fed oleandrin or oleander extract, and their blood digoxin levels at 1 and 2 h were measured with the LOCI digoxin assay. In addition, two digoxin serum pools were prepared by combining sera of patients receiving digoxin; aliquots of both pools were supplemented with oleandrin or oleander extract and digoxin concentrations were again measured. Attempts to overcome this interference were made by measuring free digoxin concentration using a third digoxin pool.</p> </sec> <sec id="jcla21637-sec-0030" sec-type="section"> <title>Results</title> <p>Significant apparent digoxin concentrations were observed after supplementing aliquots of the drug‐free serum pool with oleandrin or oleander extract. Mice fed with oleandrin or oleander extract also showed apparent digoxin levels 1 and 2 h after feeding. Digoxin values were also falsely lower or elevated (bidirectional interference) when aliquots of digoxin serum pools were further supplemented with oleandrin or oleander extract depending on concentration; this interference was not eliminated by free digoxin monitoring.</p> </sec> <sec id="jcla21637-sec-0040" sec-type="section"> <title>Conclusions</title> <p>Oleandrin interferes with LOCI digoxin assay.</p> </sec> </abstract>