Final answer:
The crew should switch compressors during continuous CPR every two minutes or approximately 100 to 120 compressions to maintain the effectiveness of the compressions and avoid fatigue.
Step-by-step explanation:
During continuous CPR, it is recommended that the crew should switch compressors every two minutes or after about 100 to 120 compressions. This recommendation is made to avoid fatigue, which could lead to ineffective chest compressions, thus diminishing the quality of CPR provided. The position of the heart in the torso, between the vertebrae and sternum, allows the compressors to manually pump the heart by applying pressure on the sternum to maintain blood flow to the brain and other organs. The current standards for CPR emphasize at least 5 cm deep chest compressions at a rate of 100 compressions per minute.