CBET - Certified Biomedical Equipment Technician Patient Monitoring Systems Questions and Answers

Question 1

A nurse reports that an ECG waveform on a patient monitor shows a thick, fuzzy baseline, consistent across all leads.
The patient is calm and still.
Which of the following is the MOST likely cause of this 60 Hz interference artifact?

Accepted Answer

Improper grounding of the monitor or another nearby electrical device.

Answer

Patient shivering or muscle tremors.

Answer

A detached right leg (reference) electrode.

Answer

The ECG gain setting being too high.

Question 2

A pulse oximeter (SpO2) determines a patient's oxygen saturation level by measuring the differential absorption of what?

Accepted Answer

Red and infrared light by arterial blood.

Answer

Blue and green light by venous blood.

Answer

Ultrasonic waves reflected by red blood cells.

Answer

The electrical impedance of blood flow in the capillaries.

Question 3

A BMET is called to check a patient monitor that repeatedly alarms for "NIBP Overpressure" and fails to provide a reading. The technician has already verified the cuff is the correct size for the patient. What is the MOST likely cause of this issue?

Accepted Answer

A blockage or kink in the NIBP hose between the monitor and the cuff.

Answer

A leak in the NIBP cuff or hose.

Answer

The NIBP pump is weak and failing.

Answer

The monitor's software requires an update.

Question 4

Which of the following is a critical step that must be performed by the clinical staff before using an invasive blood pressure (IBP) monitoring setup to ensure accurate readings?

Accepted Answer

Opening the transducer to atmospheric pressure and performing a "zero."

Answer

Applying conductive gel to the transducer.

Answer

Entering the patient's age and weight into the monitor.

Answer

Selecting the correct size NIBP cuff.

Question 5

Most modern patient monitors measure respiration rate using a technique called impedance pneumography. How is this measurement obtained?

Accepted Answer

A small, high-frequency current is passed between two ECG electrodes, and the change in thoracic impedance is measured.

Answer

A thermistor near the nose and mouth measures airflow temperature changes.

Answer

A microphone on the patient's chest detects breathing sounds.

Answer

An SpO2 sensor detects small variations in the plethysmographic waveform.

Question 6

When comparing mainstream and sidestream capnography, which of the following is a primary advantage of the mainstream method?

Accepted Answer

It provides a faster response time with a more distinct waveform.

Answer

It is less susceptible to being clogged by patient secretions.

Answer

It uses a disposable sampling line, reducing cleaning requirements.

Answer

It does not add any weight or bulk to the patient's breathing circuit.

A nurse reports that an ECG waveform on a patient monitor shows a thick, fuzzy baseline, consistent across all leads.The patient is calm and still.Which of the following is the MOST likely cause of this 60 Hz interference artifact?

A nurse reports that an ECG waveform on a patient monitor shows a thick, fuzzy baseline, consistent across all leads.
The patient is calm and still.
Which of the following is the MOST likely cause of this 60 Hz interference artifact?