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

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In cardiac arrest victims, however, expired CO₂ levels may be near zero because of poor pulmonary blood flow, yielding a false-negative result.

When Using Capnometry or Colorimetry to Differentiate Esophageal from Tracheal