Which symptom would indicate the need for immediate intervention in a patient under general anesthesia?

A decline in oxygen saturation is a critical sign that indicates a lack of adequate oxygen supply to the patient, which can be life-threatening if not addressed immediately. During general anesthesia, maintaining proper ventilation and oxygenation is essential, as patients cannot respond or protect their own airway. Significant drops in oxygen saturation can lead to hypoxemia, resulting in serious complications, including brain damage or cardiac arrest if not corrected promptly.

While other symptoms such as a decrease in heart rate, sudden increase in blood pressure, or increased sedation may warrant attention, they do not pose the same immediate risk to the patient's oxygenation status. A decline in oxygen saturation is particularly urgent, as it directly reflects the patient's ability to breathe properly and maintain adequate oxygen levels in the bloodstream. Swift intervention is required to restore oxygen saturation and ensure the patient's safety during the procedure.