Final answer:
If your patient has marked stridor, the next step is to prepare for intubation.
Step-by-step explanation:
Stridor is a harsh, high-pitched sound heard during breathing that indicates the presence of a blockage or narrowing in the upper airway. If your patient has marked stridor, the next step would be to prepare for intubation. Intubation is a procedure where a long, plastic tube is inserted into the respiratory system to bypass the obstructed area and allow air to reach the lungs. It is done to ensure adequate ventilation and oxygenation when the airway is compromised.