Capnography is essential during anesthesia monitoring because it ...

• A. Confirms ventilation
• B. Confirms tube placement
• C. All of the above
• D. Detects airway problems quickly

Answer: (C)

Capnography gives a real-time readout of exhaled CO2 and a continuous waveform, so you can monitor ventilation closely. The presence and trace of end-tidal CO2 show that CO2 is being eliminated by the lungs, confirming that ventilation is occurring and giving a sense of respiratory rate and effectiveness. After intubation, a consistent end-tidal CO2 signal indicates the tube is in the trachea rather than the esophagus, helping verify correct tube placement. Capnography also detects airway problems quickly because abrupt changes in the CO2 level or in the waveform—such as a sudden drop, loss of waveform, or recognizable waveform abnormalities—point to issues like disconnection, tube dislodgement, obstruction, or airway kinking, allowing prompt corrective action. In short, capnography supports ventilation verification, tube position confirmation, and rapid problem detection, making it essential during anesthesia monitoring.