CABT Biomedical Equipment Technology & Function 4

Question 1

Which sterilization method is most appropriate for heat-sensitive, moisture-sensitive endoscopes that cannot withstand steam autoclave cycles?

Accepted Answer

Ethylene oxide (EtO) gas sterilization

Answer

EtO gas penetrates packaging and device lumens at low temperatures, making it suitable for heat- and moisture-sensitive items like flexible endoscopes.

Question 2

In an ECG, a prolonged PR interval (>200 ms) indicates a conduction delay in which structure?

Accepted Answer

Atrioventricular (AV) node

Answer

The PR interval represents the time from atrial depolarization to ventricular depolarization; prolongation indicates slowed conduction through the AV node (first-degree AV block).

Question 3

A centrifugal blood pump used in ECMO differs from a roller pump primarily because it:

Accepted Answer

Is afterload-sensitive and cannot generate dangerously high pressures against an outlet obstruction

Answer

Centrifugal pumps are preload- and afterload-dependent; if the outlet is occluded, flow drops rather than pressure rising to dangerous levels, unlike roller pumps which can rupture the circuit.

Question 4

The 'over-damped' waveform on an arterial line pressure tracing is characterized by:

Accepted Answer

Blunted systolic peak and loss of the dicrotic notch

Answer

Over-damping (from air bubbles, clots, or compliant tubing) absorbs energy and rounds the waveform, causing underestimation of systolic pressure and loss of fine features like the dicrotic notch.

Question 5

During a nuclear medicine gamma camera quality control test, a 'uniformity flood' is performed to check:

Accepted Answer

Homogeneous sensitivity response across the detector face

Answer

A uniformity flood test exposes the entire detector to a uniform source; non-uniform response (hot or cold spots) indicates PMT or crystal problems requiring service.

(CABT) Certified Associate in Biomedical Technology Practice Test

(CABT) Certified Associate in Biomedical Technology Practice Test

CABT Biomedical Equipment Technology & Function 4