CABT Installation, Maintenance & Troubleshooting 3

Question 1

When troubleshooting an ECG machine that produces a wandering baseline, the most likely cause is:

Accepted Answer

Poor electrode-to-skin contact or patient movement

Answer

Wandering baseline on an ECG is most commonly caused by poor electrode contact, dry gel, patient movement, or respiration artifact.

Question 2

What does the term 'macroshock' refer to in the context of biomedical safety?

Accepted Answer

A larger current applied externally to the body surface sufficient to cause fibrillation

Answer

Macroshock refers to a significant electrical current entering the body through external skin contact, requiring much higher current levels than microshock to cause ventricular fibrillation.

Question 3

A pulse oximeter is reading SpO2 values of 85% on a patient who appears clinically well-oxygenated. Which factor is least likely to cause this discrepancy?

Accepted Answer

Patient's respiratory rate

Answer

Respiratory rate does not directly affect SpO2 readings; nail polish, poor perfusion, and ambient light are all known causes of inaccurate pulse oximeter readings.

Question 4

During installation, the biomedical technician should ensure that an electrically powered medical device is connected to:

Accepted Answer

A hospital-grade grounded outlet meeting applicable standards

Answer

Medical devices must be connected to hospital-grade grounded outlets that meet NFPA 99 and UL standards to ensure patient and staff safety.

Question 5

After replacing a fuse in a biomedical device, the new fuse blows immediately upon power-up. The technician should:

Accepted Answer

Investigate for a short circuit or overload condition before replacing the fuse again

Answer

An immediately blown replacement fuse indicates an underlying short circuit or overload condition that must be diagnosed and corrected before installing another fuse.

(CABT) Certified Associate in Biomedical Technology Practice Test

(CABT) Certified Associate in Biomedical Technology Practice Test

CABT Installation, Maintenance & Troubleshooting 3