Final answer:
Rescuers should switch positions during CPR about every 2 minutes to ensure the compressions remain effective. This corresponds to the time after about 5 cycles of 30 compressions and 2 breaths. AEDs, also found in ambulances and public places, should be applied as soon as possible while minimally interrupting CPR.
Step-by-step explanation:
The correct answer to when rescuers should switch positions during CPR is C. About every 2 minutes. Continuous chest compressions can be extremely tiring, and the quality of the compressions can deteriorate if the rescuer becomes exhausted. Therefore, to maintain the effectiveness of CPR, it is recommended that rescuers switch positions approximately every 2 minutes, or after about 5 cycles of 30 compressions and 2 breaths, even if they do not feel tired. This ensures that the compressions remain forceful and consistent at the proper depth and rate. It is indeed common for ambulances to carry Automated External Defibrillators, and they can be found in many public locations. When an AED is available, it should be used as soon as possible. During the switch between rescuers, one can prepare to apply the AED pads without interrupting chest compressions. CPR is often crucial in the initial minutes of cardiac arrest to maintain blood flow to the brain and heart until defibrillation can be performed.