How should ventilation be monitored?

• A. Continuously monitor ventilation by clinical observation and confirmation of continuous expired carbon dioxide
• B. Rely on chest movement alone
• C. Intermittent spirometry
• D. Temperature monitoring

Answer: (A)

Continuous monitoring of ventilation with capnography (end-tidal CO2) plus ongoing clinical observation is essential. The end-tidal CO2 waveform provides real-time feedback on whether air is actually being moved in and out of the lungs, whether the airway is patent, and whether there are any leaks, disconnections, obstructions, or apnea. This immediate information lets you detect problems within seconds and act promptly, which is crucial during anesthesia.

Relying on chest movement alone isn’t enough because breathing can appear present even when ventilation is inadequate, and external chest motion can be misleading in certain positions, neuromuscular blockade, or with shallow breaths. Intermittent spirometry doesn’t give continuous data, so rapid deteriorations can be missed. Temperature monitoring doesn’t reflect ventilation status at all.

So, continuous assessment of ventilation by clinical observation together with confirmation of continuous expired CO2 is the most reliable approach to ensure effective ventilation throughout the procedure.