ABCP Perfusion Basic Science (PBSE) Practice Exam

What measures prevent circuit air entrainment during CPB setup?

Keeping reservoir closed. Use of high suction pressure. Avoid venting. Proper priming, leak checks, and effective venting of the reservoir.

Correct Answer:

Proper priming, leak checks, and effective venting of the reservoir.

Explanation:

Preventing air from entering the bypass circuit starts with thorough priming, confirming all connections are leak-free, and venting the reservoir effectively to remove any trapped air before starting bypass. Proper priming displaces air with liquid, leak checks ensure the system is airtight, and active venting of the reservoir allows any rising air to escape, preventing bubbles from entering the pump and patient. Keeping the reservoir closed, using high suction, or avoiding venting would all increase the chance of air remaining or being drawn into the circuit, which is why those are not suitable.

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