title: Biomarker evidence of myocardial cell injury is associated with mortality in acute respiratory distress syndrome.
abstract: OBJECTIVE
  Although a number of studies have reported elevated levels of markers of myocardial necrosis among critically ill patients, the association between these markers and outcome remains poorly studied in patients with lung injury. We investigated the association of elevated troponin and creatine phosphokinase isoenzyme levels with mortality and organ failure in subjects with acute respiratory distress syndrome.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  Tertiary academic medical center.
  
  
  METHODS
  A total of 305 subjects with acute respiratory distress syndrome enrolled in a prospective intensive care unit cohort.
  
  
  METHODS
  None.
  
  
  RESULTS
  Cardiac biomarker data were available on 248 of 305 patients with acute respiratory distress syndrome (81%), of which 89 patients had at least one elevated cardiac marker level (35%). The presence of an elevated cardiac marker was associated with significantly higher mortality (p = .01) and was an independent predictor of mortality (p = .02) among patients with lower severity of illness (Acute Physiology and Chronic Health Evaluation III, <79). Patients with at least one elevated cardiac marker also had significantly more organ system derangement, including noncardiovascular organ system failures (p = .02).
  
  
  CONCLUSIONS
  Patients with acute respiratory distress syndrome have a high prevalence of elevated cardiac markers. The presence of elevated cardiac markers is independently associated with increased 60-day mortality and increased organ failure. This association is most pronounced among patients with lower severity of illness. These results indicate that occult myocardial injury may be an important factor in acute respiratory distress syndrome morbidity and mortality. Further study of the relevant causal relationships and mechanisms is warranted.
authors: Pulmonary and Critical Care Unit , Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
authors: Ednan K
authors: EK
authors: Bajwa
authors: Paul D
authors: PD
authors: Boyce
authors: James L
authors: JL
authors: Januzzi
authors: Michelle N
authors: MN
authors: Gong
authors: B Taylor
authors: BT
authors: Thompson
authors: David C
authors: DC
authors: Christiani
mesh_terms: D015415:Biomarkers; D009202:Cardiomyopathies / Q000097:blood / Q000209:etiology / Q000473:pathology; D003402:Creatine Kinase / Q000097:blood*; D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000473:pathology*; D032383:Myocytes, Cardiac / Q000473:pathology*; D009336:Necrosis; D011379:Prognosis; D012128:Respiratory Distress Syndrome / Q000097:blood* / Q000401:mortality*; D012189:Retrospective Studies; D015996:Survival Rate; D014336:Troponin / Q000097:blood*
chemical_list: D015415:Biomarkers; D007527:Isoenzymes; D014336:Troponin; D003402:Creatine Kinase