Final answer:
When more rescuers arrive, a tired lone rescuer should allow one of them to take over chest compressions after a quick briefing, ensuring high-quality CPR with minimal interruption.
Step-by-step explanation:
When additional rescuers arrive to assist a lone rescuer who is getting tired from performing chest compressions, it is crucial to perform a switch to ensure the continuation of high-quality CPR. The rescuer should inform the new rescuers of the situation and quickly but smoothly allow one of them to take over the compressions. This transition should be done with minimal interruption to the CPR being performed. Rescuers should aim to switch every two minutes or when fatigue sets in to maintain the effective rate and depth of compressions critical for patient survival. Proper training and certification in CPR techniques are essential for both medical personnel and the general public to effectively carry out this life-sustaining intervention.