When Using Capnometry or Colorimetry to Differentiate Esophageal from Tracheal

question 49

Multiple Choice

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