CLINICAL RESEARCH: CORONARY ARTERY DISEASE
Pregnancy-associated plasma protein-A levels in patients with acute coronary syndromes
Comparison with markers of systemic inflammation, platelet activation, and myocardial necrosis
Christopher Heeschen, MD*,*,
Stefanie Dimmeler, PhD*,
Christian W. Hamm, MD, FACC ,
Stephan Fichtlscherer, MD*,
Maarten L. Simoons, MD, FACC ,
Andreas M. Zeiher, MD, FACC* CAPTURE Study Investigators
* Molecular Cardiology, Department of Internal Medicine III, University of Frankfurt, Frankfurt, Germany
Kerckhoff Heart Center, Bad Nauheim, Germany
Erasmus University, Thoraxcentre, Rotterdam, the Netherlands
Manuscript received July 9, 2004;
accepted September 27, 2004.
* Reprint requests and correspondence: Dr. Christopher Heeschen, Department of Internal Medicine III, Molecular Cardiology, University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany (Email: c.heeschen{at}em.uni-frankfurt.de).
OBJECTIVES: The goal of this study was to determine the predictive value of pregnancy-associated plasma protein-A (PAPP-A) in patients with acute coronary syndromes (ACS).
BACKGROUND: Pregnancy-associated plasma protein-A is a zinc-binding matrix metalloproteinase abundantly expressed in eroded and ruptured plaques and may serve as a marker of plaque destabilization.
METHODS: In 547 patients with angiographically validated ACS and in a heterogeneous emergency room population of 644 patients with acute chest pain, respectively, PAPP-A as well as markers of myocardial necrosis (troponin T [TnT]), ischemia (vascular endothelial growth factor [VEGF]), inflammation (high-sensitivity C-reactive protein [hsCRP]), anti-inflammatory activity (interleukin [IL]-10), and platelet activation (soluble CD40 ligand [sCD40L]) were determined. Patients were followed for the occurrence of death or myocardial infarction.
RESULTS: In patients with ACS, elevated PAPP-A levels (>12.6 mIU/l) indicated an increased risk (odds ratio 2.44 [95% confidence interval (CI) 1.43 to 4.15]; p = 0.001). When the analysis was restricted to TnT-negative patients, PAPP-A still identified a subgroup of high-risk patients (odds ratio [OR] 2.72 [95% confidence interval (CI) 1.25 to 5.89]; p = 0.009). In a multivariable model, PAPP-A (OR 2.01; p = 0.015), sCD40L (OR 2.37; p = 0.003), IL-10 (OR 0.43; p = 0.003), and VEGF (OR 2.19; p = 0.018) were independent predictors. Prospective validation in patients with chest pain confirmed that PAPP-A levels reliably identify high-risk patients (adjusted OR 2.32 [95% CI 1.32 to 4.26]; p = 0.008). Patients negative for all three markers (TnT, sCD40L, and PAPP-A) were at very low cardiac risk (30 days: 3.0% event rate; no death).
CONCLUSIONS: The PAPP-A level as a marker of plaque instability is a strong independent predictor of cardiovascular events in patients with ACS. Simultaneous determination of biomarkers with distinct pathophysiological profiles appears to remarkably improve risk stratification in patients with ACS.
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Abbreviations and Acronyms
| | ACS = acute coronary syndromes | | CAPTURE c7E3 = Anti Platelet Therapy in Unstable Refractory Angina trial | | CI = confidence interval | | hsCRP = high-sensitivity C-reactive protein | | IL = interleukin | | PAPP-A = pregnancy-associated plasma protein A | | ROC = receiver operating characteristic | | sCD40L = soluble CD40 ligand | | TnT = troponin T | | VEGF = vascular endothelial growth factor |
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