Final answer:
The next step for post cardiac arrest care is to provide comprehensive critical care and ongoing monitoring.
Step-by-step explanation:
After a patient has returned to normal rhythm following cardiac arrest, the next step for post cardiac arrest care is to provide comprehensive critical care and ongoing monitoring. This includes ensuring adequate oxygenation and ventilation, maintaining stable blood pressure, managing electrolyte imbalances, and initiating therapeutic hypothermia if indicated. In addition, the underlying cause of the cardiac arrest should be identified and addressed to prevent future occurrences.