An 82-year-old nursing home resident with advanced dementia and end-stage chronic kidney disease is brought to the emergency department unresponsive after being found pulseless and apneic 45 minutes earlier. CPR has been ongoing for 20 minutes. The cardiac monitor shows the rhythm marked **B** in the diagram—a flat isoelectric baseline with no identifiable electrical activity. The team leader confirms this finding by changing leads, increasing monitor gain, and checking cable integrity. Which of the following is the MOST APPROPRIATE immediate management step for this rhythm?
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