Why is capnography a critical tool after airway placement?

Why is capnography a critical tool after airway placement?

• A. It measures blood pressure
• B. It confirms intrathoracic ventilation and tube position, and provides ongoing ventilation trends
• C. It monitors heart rate
• D. It provides oxygen saturation

Answer: (B)

Capnography gives real-time feedback on ventilation and tube position. By measuring end-tidal CO2 and showing a continuous waveform, you can confirm that air is moving through the lungs and that the tube is in the trachea, not the esophagus. The presence of a consistent capnography waveform after intubation means intrathoracic ventilation is occurring and the airway is patent. Beyond placement, capnography tracks ventilation trends over time, so you can detect changes quickly—such as hypoventilation, apnea, disconnections, or obstruction—before they become apparent on other monitors. Blood pressure and heart rate monitor hemodynamics and don’t tell you whether the airway is correctly positioned or immediately how well ventilation is proceeding. Oxygen saturation shows how well oxygen is being carried in the blood but can lag behind ventilation changes and won’t confirm tube position or provide the immediate ventilation trend data that capnography offers.

Capnography gives real-time feedback on ventilation and tube position. By measuring end-tidal CO2 and showing a continuous waveform, you can confirm that air is moving through the lungs and that the tube is in the trachea, not the esophagus. The presence of a consistent capnography waveform after intubation means intrathoracic ventilation is occurring and the airway is patent. Beyond placement, capnography tracks ventilation trends over time, so you can detect changes quickly—such as hypoventilation, apnea, disconnections, or obstruction—before they become apparent on other monitors.

Blood pressure and heart rate monitor hemodynamics and don’t tell you whether the airway is correctly positioned or immediately how well ventilation is proceeding. Oxygen saturation shows how well oxygen is being carried in the blood but can lag behind ventilation changes and won’t confirm tube position or provide the immediate ventilation trend data that capnography offers.