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Assessment of the nickel-albumin binding assay for diagnosis of acute coronary syndrome
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Sandra Huber da Silva
Published/Copyright:
December 14, 2010
Abstract
Background: Myocardial ischemia may alter the metal binding capacity of circulating serum albumin. Thus, the aim of this study was to describe an automated method to measure ischemia-induced alterations in the binding capacity of serum albumin for exogenous nickel, and to evaluate the diagnostic characteristics of this assay for the assessment of acute coronary syndrome (ACS) in patients presenting to the emergency room (ER) with acute chest pain.
Methods: We assessed the concentrations of cardiac troponin I (cTnI), serum albumin, ischemia-modified albumin (IMA) measured by the cobalt-albumin binding assay (CABA), and by an automated nickel-albumin binding assay (NABA) in the following groups: ACS (n=63) and non-ischemic chest pain (NICP, n=26). Biochemical markers were determined in blood samples obtained from patients within 3 h of ER admission.
Results: cTnI, CABA and NABA concentrations were higher in ACS group in comparison to the NICP group. A significant correlation between NABA and CABA was observed (r=0.5387, p<0.001). Areas under the curve for CABA and NABA were 0.7289 and 0.7582, respectively. Both CABA and NABA have the ability to discriminate patients with ACS. However, NABA has a slightly higher ability to discriminate ACS compared with CABA.
Conclusions: Patients with ACS have reduced nickel binding to human serum albumin, and NABA may have an important role as an early marker of myocardial ischemia, particularly in patients presenting to the ER with acute chest pain.
Keywords: acute coronary syndrome; ischemia-modified albumin; myocardial ischemia; nickel; serum albumin
Received: 2010-5-28
Accepted: 2010;-9-16
Published Online: 2010-12-14
Published in Print: 2011-03-01
©2011 by Walter de Gruyter Berlin New York
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Keywords for this article
acute coronary syndrome;
ischemia-modified albumin;
myocardial ischemia;
nickel;
serum albumin
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