How should oxygenation be monitored during anesthesia?

• A. Continuously monitor oxygenation by clinical observation and pulse oximetry
• B. Intermittent auscultation
• C. Arterial blood gas drawn every hour
• D. Temperature monitoring only

Answer: (A)

Oxygenation must be monitored continuously during anesthesia to detect hypoxemia promptly and intervene before it becomes dangerous. The most effective approach is real-time, noninvasive monitoring with pulse oximetry, which provides ongoing SpO2 values, complemented by continuous clinical observation of ventilation and airway status (breathing effort, chest rise, airway patency). This combination allows immediate detection of deteriorations in oxygenation and quick corrective actions, such as increasing FiO2, adjusting ventilation, or addressing airway problems.

Intermittent auscultation can miss brief or transient drops in oxygenation. Arterial blood gas measurements, even if performed hourly, only provide a snapshot and involve invasiveness and delays in getting results. Temperature monitoring alone gives no information about oxygenation status.