CABT Clinical Procedures & Techniques 5

Question 1

A ventilator's flow sensor reads consistently lower than the rotameter reference during a performance verification. The MOST likely cause is:

Accepted Answer

Moisture condensation or contamination in the flow sensor

Answer

Moisture or secretion buildup inside the flow sensor is the most common cause of artificially low flow readings in mechanical ventilators.

Question 2

The 'dead volume' in a syringe pump infusion system is clinically significant because it:

Accepted Answer

Delays actual drug delivery when a new syringe is loaded or rate is changed

Answer

Dead volume in the syringe plunger and tubing means the pump must compress or expand that volume before drug flow reaches the patient, creating a clinically important delivery lag.

Question 3

Which parameter should a biomedical technician verify when performing a functional check on an automated external defibrillator (AED) self-test override?

Accepted Answer

Shock delivery into a 50-ohm load

Answer

Functional AED testing requires delivering a shock into a 50-ohm test load (simulating adult thoracic impedance) and verifying the delivered energy is within specification.

Question 4

During a point-of-care (POC) i-STAT analyzer quality control failure, the FIRST action by the biomedical technician should be to:

Accepted Answer

Check control expiration dates, storage conditions, and cartridge lot

Answer

Troubleshooting QC failure starts with verifying pre-analytical variables: control solution expiration, proper storage temperature, and matching cartridge lot numbers to control insert values.

Question 5

In transcutaneous electrical nerve stimulation (TENS) therapy setup, 'conventional TENS' mode is characterized by:

Accepted Answer

High frequency (80–150 Hz), low intensity pulses below motor threshold

Answer

Conventional TENS uses high-frequency, low-intensity stimulation that activates large-diameter A-beta sensory fibers for gate control pain relief without eliciting muscle contractions.

(CABT) Certified Associate in Biomedical Technology Practice Test

(CABT) Certified Associate in Biomedical Technology Practice Test

CABT Clinical Procedures & Techniques 5