Review questions: CPR

386. What is the most common reason for obtaining a false negative reading on an end-tidal CO2 detector device after intubating the trachea?

The most common reason for a false negative reading is that blood flow and delivery of CO2 to the lungs is low. 

387. How is a false negative reading defined when using an end tidal CO2 device

False-negative readings are defined in as failure to detect CO2 despite tube placement in the trachea. 

388. What are some acceptable reasons for interrupting cardiac compressions during CPR?

Periodic pauses in CPR should be as brief as possible and only as necessary to assess rhythm, shock VF/VT, and perform a pulse check when an organized rhythm is detected, or place an advanced airway.

389. What is the meaning of the term End-tidal CO2? 

End-tidal CO2 is the concentration of carbon dioxide in exhaled air at the end of expiration. It is typically expressed as a partial pressure in mm Hg (PETCO2). 

390. What is the normal end-tidal CO2 value?

Under normal conditions PETCO2 is in the range of 35 to 40 mm Hg. 


Reviewed 2/28/16