title: Rapid measurement of S-100B serum protein levels by Elecsys S100 immunoassay in patients undergoing carotid artery stenting or endarterectomy.
abstract: OBJECTIVE
  This study was designed to apply the rapid Elecsys S100 immunoassay for real-time measurement of S100 protein serum levels indicating acute brain damage in patients undergoing carotid artery stenting (CAS) or endarterectomy (CEA).
  
  
  METHODS
  Data of 14 CAS patients were compared to those of 43 CEA and 14 control patients undergoing coronary angiography (CA). S100 serum levels were measured by the full-automatic Elecsys S100 immunoassay and compared to those obtained by the well-established LIA-mat S100 system.
  
  
  RESULTS
  In contrast to CAS and CA patients, median S100 serum levels of CEA patients significantly increased to 0.24 ng/mL before declamping, but subsequently returned to baseline. Three CEA patients with neurological deficits showed sustained elevated S100 levels 6 h after extubation. Absolute S100 values were not significantly different between the two methods. Bland-Altman plot analyses displayed a good agreement, mostly indicating slightly smaller values applying the Elecsys S100 system.
  
  
  CONCLUSIONS
  The Elecsys S100 system appears to be suitable for rapid real-time detection of neurological deficits in patients undergoing CAS and CEA. Persistent elevations of Elecsys S100 levels during CEA were associated with prolonged neurological disorders, whereas transient increases seem to represent impaired blood-brain barrier integrity without neurological deficits.
authors.affiliation: Department of Surgery Innenstadt, Klinikum der Universität München, Nussbaumstrasse 20, D-80336 Munich, Germany. Thomas.Mussack@med.uni-muenchen.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Mussack
authors.forename: Volker
authors.initials: V
authors.lastname: Klauss
authors.forename: Volker
authors.initials: V
authors.lastname: Ruppert
authors.forename: Cornelia
authors.initials: C
authors.lastname: Gippner-Steppert
authors.forename: Peter
authors.initials: P
authors.lastname: Biberthaler
authors.forename: Uwe
authors.initials: U
authors.lastname: Schiemann
authors.forename: Ulrich
authors.initials: U
authors.lastname: Hoffmann
authors.forename: Marianne
authors.initials: M
authors.lastname: Jochum
mesh_terms: D000368:Aged; D002339:Carotid Arteries / Q000473:pathology*; D016894:Endarterectomy, Carotid; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009414:Nerve Growth Factors / Q000097:blood*; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins / Q000097:blood*; D015607:Stents
chemical_list: D009414:Nerve Growth Factors; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins