When using capnometry or colorimetry to differentiate esophageal from tracheal placement of an endotracheal tube, which of the following conditions can result in a false-negative finding (i.e., no CO2 present even when the tube is in the trachea)?
a. Cardiac arrest
b. Gastric CO2 diffusion
c. Right main stem intubation
d. Delivery of a high FiO2
ANS: A
In cardiac arrest victims, however, expired CO2 levels may be near zero because of poor pulmo-nary blood flow, yielding a false-negative result.
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