CBET Ultimate 4

Question 1

A centrifugal blood pump used in ECMO loses prime and shows air in the circuit. What is the IMMEDIATE corrective action?

Accepted Answer

Clamp the circuit and notify the perfusionist/physician immediately

Answer

Air in an ECMO circuit is a life-threatening emergency requiring immediate circuit clamping and clinical team notification to prevent air embolism.

Question 2

What does the term 'macroshock' mean in the context of electrical safety?

Accepted Answer

Sufficient current applied to the body surface to cause ventricular fibrillation (typically >100 mA)

Answer

Macroshock refers to externally applied current large enough to cause physiological harm including ventricular fibrillation, typically requiring >100 mA.

Question 3

A digital X-ray flat panel detector shows persistent ghost images (image lag). What is the MOST likely cause?

Accepted Answer

Residual charge trapped in amorphous silicon photodiodes between exposures

Answer

Image lag in flat panel detectors occurs when residual charge from a prior exposure is incompletely cleared from the photodiode array before the next acquisition.

Question 4

Which type of medical gas pipeline color is used for oxygen in US healthcare facilities per NFPA 99?

Accepted Answer

Green

Answer

In the United States, oxygen medical gas pipelines and outlets are color-coded green per NFPA 99 standards.

Question 5

A patient-controlled analgesia (PCA) pump is delivering more drug than programmed. Which safety mechanism has MOST likely failed?

Accepted Answer

The anti-siphon valve or free-flow protection mechanism

Answer

Free-flow protection and anti-siphon valves prevent gravity-driven uncontrolled drug delivery; failure of these mechanisms causes over-infusion.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET Ultimate 4