The effectiveness of CPR can be judged by ETCO₂ values. Consistently high ETCO₂ values indicate well executed CPR. An ETCO₂ higher than 19 mm Hg at the start of CPR has been associated with successful return of pulse. Furthermore, survivors had higher ETCO2 than non survivors and no patient whose ETCO₂ was less than 10 mm Hg during CPR could be successfully resuscitated. These details have been stated in 911 section of this website. Usual trend of ETCO₂ during impending arrest, arrest and successful resuscitations is shown below.

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