How often should CPR responders ideally switch if they are trained and available?

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The optimal frequency for trained CPR responders to switch roles during compressions is after every 5 cycles of CPR, which typically equates to about every 2 minutes. This recommendation is based on the understanding that high-quality CPR requires considerable physical effort, and fatigue can set in quickly, potentially compromising the effectiveness of the compressions. By rotating every 5 cycles, responders can maintain the quality and efficiency of compressions, ensuring that they maintain the necessary rate and depth to be effective.

The other choices suggest intervals that are either too short or too limited in context, which may lead to unnecessary disruptions in the rhythm of compressions. Switching only after a shock is administered would not provide the consistent care needed for a person in cardiac arrest and may result in prolonged periods of suboptimal CPR.