title: Potential use of procalcitonin as biomarker for bacterial sepsis in patients with or without acute kidney injury.
abstract: BACKGROUND
  There are few investigations regarding the relationships between procalcitonin (PCT) and the acute kidney injury (AKI) in the diagnosis of sepsis. The purpose of this study was to clarify the diagnostic accuracy of the use of PCT levels in patients with or without AKI.
  
  
  METHODS
  This study was conducted as a single-center retrospective study. We enrolled 393 patients in whom PCT were measured on admission. We grouped the patients into non-AKI and AKI, and those with AKI were classified according to the RIFLE criteria (Risk, Injury, Failure). The patients in each group were further classified into the sepsis and the non-sepsis group. We subsequently investigated the diagnostic accuracy of the PCT for detecting sepsis in these groups.
  
  
  RESULTS
  The levels of PCT were significantly higher in the sepsis group than in the non-sepsis group among the non-AKI and each AKI patients (p < 0.0001). The diagnostic accuracy of the PCT for detecting sepsis was determined according to a ROC analysis; AUC value was 0.958 in the non-AKI group, in the Risk, Injury and Failure groups were 0.888 and 0.917, 0.857, respectively. AUC value for non-AKI group was significantly different from that of Failure group (p < 0.05).
  
  
  CONCLUSIONS
  In Failure AKI patients, the diagnostic accuracy of the PCT level is significantly lower than non-AKI patients. It is therefore suggested that we should be careful in using PCT value to diagnose sepsis in patients with Failure under RIFLE criteria.
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: pdmxy827@yahoo.co.jp.
authors: Yoshihiko
authors: Y
authors: Nakamura
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: akiramurai.fuk@gmail.com.
authors: Akira
authors: A
authors: Murai
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: numariko625@gmail.com.
authors: Mariko
authors: M
authors: Mizunuma
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: d-oota@fasd.or.jp.
authors: Daiki
authors: D
authors: Ohta
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: kawano0301@cis.fukuoka-u.ac.jp.
authors: Yasumasa
authors: Y
authors: Kawano
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: noirnori107@yahoo.co.jp.
authors: Norihiko
authors: N
authors: Matsumoto
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: bushinishitaxi007@gmail.com.
authors: Takeshi
authors: T
authors: Nishida
authors: Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, Japan. Electronic address: ishikurah@fukuoka-u.ac.jp.
authors: Hiroyasu
authors: H
authors: Ishikura
mesh_terms: D058186:Acute Kidney Injury / Q000097:blood* / Q000150:complications* / Q000453:epidemiology; D000368:Aged; D015415:Biomarkers / Q000097:blood*; D002116:Calcitonin / Q000097:blood*; D015740:Calcitonin Gene-Related Peptide; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011498:Protein Precursors / Q000097:blood*; D012189:Retrospective Studies; D018805:Sepsis / Q000097:blood* / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology
chemical_list: D015415:Biomarkers; C000606589:CALCA protein, human; D011498:Protein Precursors; D002116:Calcitonin; D015740:Calcitonin Gene-Related Peptide
keywords: Acute kidney injury; Diagnosis; Procalcitonin; Sepsis