Final answer:
The next course of action should be to increase the suction pressure to 120 mm Hg.
Step-by-step explanation:
In this situation, the next course of action should be to increase the suction pressure to 120 mm Hg.
When a patient becomes diaphoretic and their SpO₂ suddenly drops, it could indicate an obstruction in their airway. By increasing the suction pressure, it will help to clear the airway and improve the patient's oxygenation.