Which of the following is NOT part of the safety checks performed every 4 hours?

The correct answer highlights a key aspect of the safety checks performed on ECMO systems. Performing a check to ensure that the ECMO circuitry is opened does not fall under the routine safety assessments typically conducted every four hours. Instead, the focus during these checks is primarily on ensuring the system's operational integrity and readiness.

Safety practices would involve verifying that all cords are properly plugged in to designated outlets to maintain consistent power supply, confirming the location and accessibility of backup consoles to ensure prompt response in case of system failure, and ensuring that gas lines are properly connected to prevent any interruptions in the oxygen supply. These elements are critical for maintaining system functionality and patient safety.

Conversely, confirming the open status of circuitry is more about the surgical setup and ensuring proper priming rather than a systemic check of the ECMO's ongoing function. Therefore, it does not align with the routine safety checks that are essential for continuous operation and monitoring.