Sunday, January 26, 2020


Q: End-Tidal CO2 is measured at? (select one)

A) Beginning of inhalation
B) Beginning of exhalation

Answer: A

An end-tidal CO2 is basically a simple graphic measurement of how much CO2 a person is exhaling, so it is the amount of CO2 at the beginning of the inhalation, a peak with maximum CO2. Although ET-CO2 is used in a wide range of pathologies, in ICU they are very helpful in 

  •  Verification and maintenance of placement of the endotracheal tube (ETT) 
  •  Effectiveness of CPR 
  •  Indicator of ROSC during chest compressions 
  •  Determining the adequacy of ventilation



1. Bhavani-Shankar K, Philip JH. Defining segments and phases of a time capnogram. Anesth Analg. 2000;91(4):973-7.

2. DiCorpo JE, Schwester D, Dudley LS, et al. A wave as a window. Using waveform capnography to achieve a bigger physiological patient picture. JEMS. 2015;40(11):32-35. 

3. Link MS, Berkow LC, Kudenchuk PJ, et al. Part 7: Adult advanced cardiovascular life support: 2015 American Heart Association guidelines update for cardiopulmonary resuscitation and emergency cardiovascular care. Circulation. 2015;132(18 Suppl 2):S444-464. 

4. Gravenstein JS, Jaffe MB, Gravenstein N, et al., editors. Capnography. Cambridge University Press: Cambridge, UK, 2011.

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