In which situation is it necessary to hand crank the blood pump?

Hand cranking the blood pump becomes necessary in the event of machine failure or power loss. This situation requires immediate action to maintain blood flow and ensure patient safety. When the blood pump loses power or the machine malfunctions, it could lead to the risk of the patient experiencing complications if blood is not being circulated effectively. Hand cranking serves as a manual backup to maintain the flow of blood while troubleshooting or addressing the underlying issue with the machine.

During instances such as a patient reaction, machine maintenance, or manual dialysis, other protocols or procedures are typically in place. In these scenarios, the blood pump may not need to be hand-cranked; instead, alternative interventions would be utilized based on the circumstances at hand.