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S100 calcium binding protein B as a biomarker of delirium duration in the intensive care unit – an exploratory analysis

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Author(s): Khan BA | Farber MO | Campbell N | Perkins A | Prasad NK | Hui SL | Miller DK | Calvo-Ayala E | Buckley JD | Ionescu R | Shekhar A | Ely EW | Boustani MA

Journal: International Journal of General Medicine
ISSN 1178-7074

Volume: 2013;
Issue: default;
Start page: 855;
Date: 2013;
Original page

ABSTRACT
Babar A Khan,1–3 Mark O Farber,1 Noll Campbell,2–5 Anthony Perkins,2,3 Nagendra K Prasad,6 Siu L Hui,1–3 Douglas K Miller,1–3 Enrique Calvo-Ayala,1 John D Buckley,1 Ruxandra Ionescu,1 Anantha Shekhar,1 E Wesley Ely,7,8 Malaz A Boustani1–3 1Indiana University School of Medicine, 2Indiana University Center for Aging Research, 3Regenstrief Institute, Inc., 4Wishard Health Services, Indianapolis, 5Department of Pharmacy Practice, Purdue University College of Pharmacy, West Lafayette, 6Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN, 7Vanderbilt University School of Medicine, 8VA Tennessee Valley Geriatric Research Education Clinical Center (GRECC), Nashville, TN, USA Background: Currently, there are no valid and reliable biomarkers to identify delirious patients predisposed to longer delirium duration. We investigated the hypothesis that elevated S100 calcium binding protein B (S100β) levels will be associated with longer delirium duration in critically ill patients. Methods: A prospective observational cohort study was performed in the medical, surgical, and progressive intensive care units (ICUs) of a tertiary care, university affiliated, and urban hospital. Sixty-three delirious patients were selected for the analysis, with two samples of S100β collected on days 1 and 8 of enrollment. The main outcome measure was delirium duration. Using the cutoff of
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