title: End-tidal carbon dioxide during cardiopulmonary resuscitation in humans presenting mostly with asystole: a predictor of outcome.
abstract: OBJECTIVE
  To determine whether continuous semiquantitative assessment of end-tidal CO2 could provide a highly sensitive predictor of return of spontaneous circulation during cardiopulmonary resuscitation (CPR).
  
  
  METHODS
  Prospective, clinical study.
  
  
  METHODS
  Prehospital CPR.
  
  
  METHODS
  One hundred twenty patients, during nontraumatic cardiac arrest.
  
  
  METHODS
  End-tidal CO2 values were measured continuously after tracheal intubation, and were categorized as the initial value, and as minimal and maximal values during the first 20 mins.
  
  
  RESULTS
  Presenting rhythm was asystole in 22 of the first 24 patients. Return of spontaneous circulation occurred in eight patients. Initial, minimal, and maximal end-tidal CO2 values were significantly (p < .01) higher in these patients than in the patients without return of spontaneous circulation. Cutoff values providing a 100% sensitivity and the highest specificity in predicting return of spontaneous circulation were found to be 10 torr for initial and maximal end-tidal CO2 values, and 2 torr for the minimal end-tidal CO2 value. The number of patients required to reject (with a risk error of <.05) the hypothesis of an actual sensitivity of < or = 90% for an observed sensitivity of 100% was found to be 95. In the second part of the study, this hypothesis was prospectively tested for initial and maximal end-tidal CO2 values in the subsequent 96 patients. Presenting cardiac rhythm was asystole in 87 patients. Return of spontaneous circulation was obtained in 30 patients. The cutoff value of 10 torr for maximal end-tidal CO2 during the first 20 mins after tracheal intubation provided an observed sensitivity of 100% in predicting return of spontaneous circulation with a specificity of 67%. This result allows rejection of the hypothesis of an actual sensitivity of < or = 90% (p = .042). By contrast, the observed sensitivity of initial end-tidal CO2 was only 87%.
  
  
  CONCLUSIONS
  End-tidal CO2 represents a valuable tool for monitoring patients presenting with asystole during prehospital CPR. Fluctuations in end-tidal CO2 during CPR and the utility of end-tidal CO2 in detecting return of spontaneous circulation justify its continuous measurement. In addition, a high sensitivity (>90%) in predicting return of spontaneous circulation is prospectively demonstrated using the maximal end-tidal CO2 during the first 20 mins after tracheal intubation, with a cutoff value of 10 torr. Such a prognostic indicator could be used for a more rational approach to prolonged CPR.
authors.affiliation: Department of Anesthesiology, Henri Mondor Hospital, Créteil, France.
authors.forename: J P
authors.initials: JP
authors.lastname: Cantineau
authors.forename: Y
authors.initials: Y
authors.lastname: Lambert
authors.forename: P
authors.initials: P
authors.lastname: Merckx
authors.forename: P
authors.initials: P
authors.lastname: Reynaud
authors.forename: F
authors.initials: F
authors.lastname: Porte
authors.forename: C
authors.initials: C
authors.lastname: Bertrand
authors.forename: P
authors.initials: P
authors.lastname: Duvaldestin
mesh_terms: D000368:Aged; D001944:Breath Tests; D002245:Carbon Dioxide / Q000378:metabolism*; D016887:Cardiopulmonary Resuscitation; D005260:Female; D006323:Heart Arrest / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D011237:Predictive Value of Tests; D011379:Prognosis; D011446:Prospective Studies; D015203:Reproducibility of Results; D013990:Tidal Volume; D013997:Time Factors
chemical_list: D002245:Carbon Dioxide