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

Increase pump RPM

Answer

Add normal saline to the reservoir

Answer

Decrease gas sweep flow

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

Current delivered directly to the heart via a catheter

Answer

Any shock that causes skin burns

Answer

Shock from voltages above 1,000 V

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

Incorrect collimation

Answer

Overexposed cassette

Answer

Faulty anti-scatter grid

Question 4

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

Accepted Answer

Green

Answer

Blue

Answer

Yellow

Answer

Gray

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

The display backlight

Answer

The alarm speaker

Answer

The battery backup system

Question 6

In a clinical laboratory analyzer, a hemolyzed sample would cause which type of result error?

Accepted Answer

Falsely elevated potassium and LDH due to intracellular contents released

Answer

Falsely decreased potassium levels

Answer

Falsely decreased bilirubin

Answer

Falsely elevated sodium

Question 7

When performing acceptance testing on a new infusion pump, which document provides the minimum performance requirements to verify?

Accepted Answer

The manufacturer's operator manual and device specifications

Answer

The hospital formulary

Answer

OSHA 1910 standards

Answer

The hospital's billing codes