title: Prognostic performance of diffusion-weighted MRI combined with NSE in comatose cardiac arrest survivors treated with mild hypothermia.
abstract: BACKGROUND
  MRI-based prognostication of comatose cardiac arrest survivors has shown promising results. However, the technique has not been validated in patients treated with therapeutic hypothermia and it is unknown how it might add to NSE-based prognostication. We sought to evaluate the prognostic performance of regional apparent diffusion coefficient (ADC) in comatose out-of-hospital cardiac arrest (OHCA) patients treated with mild hypothermia and its added value to NSE-based prognostication.
  
  
  METHODS
  An OHCA registry was analyzed to identify OHCA patients older than 15 who were treated with therapeutic hypothermia and underwent brain MRI between 2008 and 2011. Quantitative measurement of regional ADCs was performed by a radiologist blinded to the clinical outcome.
  
  
  RESULTS
  Of the 43 eligible patients, 11 (18.6 %) achieved a good outcome (6-month CPC of 1 or 2). The regional ADC of the occipital cortex showed the highest discriminatory power with an area under the curve of receiver operating characteristic (AUROC) of 0.943 (95 % CI, 0.872-1.000) and predicted poor outcomes with a sensitivity of 90.6 % and a specificity of 100 %. The AUROC for NSE levels (48-h) was 0.911 (95 % CI, 0.801-1.000) which was significantly correlated with the regional ADC (Pearson's r = -0.674, p < .001). The ADC-based predictions identified an additional 5 (35.7 %) poor outcome patients out of 14 with 48-h NSE levels less than 78.9 ng/mL, which is the cutoff point suggested in a previous study. However, additional prognostic information was not provided when the 48-h NSE levels were >78.9 ng/mL.
  
  
  CONCLUSIONS
  Regional ADC-based prognostication was accurate in OHCA patients who were treated with mild hypothermia. However, it only provided additional prognostic information when the 48-h NSE levels indicated a good prognosis (48-h NSE <78.9 ng/mL).
authors.affiliation: Department of Emergency Medicine, Seoul National University Bundang Hospital, 166 Gumi-ro, Bundang-gu, Seongnam-si, 463-707, Gyeonggi-do, Republic of Korea.
authors.forename: Joonghee
authors.initials: J
authors.lastname: Kim
authors.forename: Byung Se
authors.initials: BS
authors.lastname: Choi
authors.forename: Kyuseok
authors.initials: K
authors.lastname: Kim
authors.forename: Cheolkyu
authors.initials: C
authors.lastname: Jung
authors.forename: Jae Hyuk
authors.initials: JH
authors.lastname: Lee
authors.forename: You Hwan
authors.initials: YH
authors.lastname: Jo
authors.forename: Joong Eui
authors.initials: JE
authors.lastname: Rhee
authors.forename: Taeyun
authors.initials: T
authors.lastname: Kim
authors.forename: Kyeong Won
authors.initials: KW
authors.lastname: Kang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000473:pathology; D003128:Coma / Q000401:mortality / Q000473:pathology* / Q000628:therapy; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods / Q000592:standards*; D005260:Female; D006801:Humans; D007036:Hypothermia, Induced / Q000379:methods*; D008297:Male; D008875:Middle Aged; D058687:Out-of-Hospital Cardiac Arrest / Q000401:mortality / Q000473:pathology* / Q000628:therapy; D010751:Phosphopyruvate Hydratase / Q000097:blood*; D011379:Prognosis; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012307:Risk Factors; D012680:Sensitivity and Specificity; D017741:Survivors / Q000706:statistics & numerical data
chemical_list: D010751:Phosphopyruvate Hydratase