Final answer:
In adult two-rescuer CPR, the carotid artery should be checked for a pulse during two-minute cycles, typically after every 5 cycles of compressions and breaths, when there's a switch between rescuers, and it must be done quickly to minimize interruptions in chest compressions.
Step-by-step explanation:
When performing adult two-rescuer CPR, a rescuer should palpate the carotid artery to check for the return of a spontaneous pulse during the two-minute cycles of CPR, typically after every 5 cycles of 30 compressions and 2 breaths, or when there is a switch between rescuers. The carotid artery is used because it is a central artery that provides a reliable indication of cardiac activity. It is essential to minimize interruptions in chest compressions during CPR; therefore pulse checks should be quick, not exceeding 10 seconds.
During CPR, one should apply pressure to the sternum between the lines at T4 and T9, compressing the chest at least 5 cm deep and at a rate of 100 compressions per minute, which is the beat of 'Staying Alive' by the Bee Gees. High-quality chest compressions are emphasized over artificial respiration, and CPR should continue until there is a return of spontaneous circulation or the patient is declared deceased by a healthcare professional. Proper training and certification in CPR are crucial for all medical personnel and concerned public members to avoid potentially fatal errors during the procedure.