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. Author manuscript; available in PMC: 2013 Mar 26.
Published in final edited form as: Emerg Med Clin North Am. 2011 Oct 15;30(1):105–122. doi: 10.1016/j.emc.2011.09.001

Fig. 2.

Fig. 2

Using end-tidal (ET) CO2 to detect ROSC. From onset of arrest (#), note slow increase in end-tidal CO2 as compressions are delivered. With ROSC (arrow), organized ECG rhythm begins to appear under chest compression artifact (asterisk) and end-tidal CO2 rises suddenly to greater than 50 mmHg. Providers could have used the rapid rise in end-tidal CO2 as a clinical guide that there was a return of spontaneous circulation, without having to pause chest compressions and risk interruption of CPR for a rhythm check.