Which monitoring technique provides real-time feedback on ventilation during procedural sedation?

• A. Capnography
• B. Pulse oximetry
• C. ECG monitoring
• D. Blood pressure monitoring

Answer: (A)

Real-time assessment of how well a patient is ventilating is best done with capnography. It measures end-tidal CO2—the amount of carbon dioxide at the end of exhalation—and displays a continuous capnogram waveform. This gives immediate feedback on ventilation: if breaths become shallow or stop (apnea), if there’s airway obstruction, or if there’s a disconnection, the end-tidal CO2 value and waveform change within seconds. That rapid signal allows prompt intervention long before oxygen saturation would drop.

Pulse oximetry, while crucial, reflects oxygenation and can remain normal even when ventilation is impaired, especially if the patient is receiving supplemental oxygen. ECG monitors heart rhythm and rate, not ventilation, and blood pressure monitoring tracks perfusion and can lag behind respiratory changes. Hence, capnography provides the most direct, timely insight into ventilation during procedural sedation.