Final answer:
To ensure stability and prompt medical attention, the pulse of an unconscious patient should be checked every 15 seconds during transport.
Step-by-step explanation:
The pulse of an unconscious patient should be checked during transport every 15 seconds to ensure that their condition is stable and to detect any changes in their heart rate which may indicate a deterioration in their status. This frequent check allows for prompt medical attention should the patient's condition worsen.
As a reference to the given context, if a heart rate is 150 beats per minute during strenuous exercise, the time per beat in seconds is calculated by dividing 60 seconds by the heart rate. For example, 60 seconds divided by a heart rate of 150 beats per minute equals 0.4 seconds per beat. Regular monitoring of heart rate, whether during exercise or in a clinical situation, is key for assessing cardiovascular function.