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The indication that CPR was successful primarily lies in the victim demonstrating signs of recovery, such as starting to breathe normally. This is a crucial marker because it suggests that circulation has been restored and the heart is effectively pumping blood, which is vital for delivering oxygen to the body's organs and tissues. When a person begins to breathe on their own, it reflects that their body is beginning to resume normal function and respond to the CPR being administered.

This is a positive outcome and implies that the necessary intervention was effective in addressing the immediate life-threatening situation. It signifies that the actions taken, whether chest compressions, rescue breaths, or other measures, have had the desired effect of restoring a viable state in the victim. In situations where CPR is needed, the ultimate goal is to reestablish effective breathing and circulation, so witnessing these signs is the best confirmation of success.