FREE BRPT Performing and Verifying Physiologic Calibrations Questions and Answers

Question 1

What is the primary purpose of performing physiologic calibrations (biocals) before starting a sleep study recording?

Accepted Answer

To verify the integrity and proper response of all recorded signals.

Answer

To diagnose the patient's sleep disorder before the study begins.

Answer

To ensure the patient is comfortable with the electrodes.

Answer

To determine the correct CPAP pressure for the patient.

Question 2

During EOG calibrations, the technologist asks the patient to 'look left, then look right'. What is the expected signal response in the LOC-M2 and ROC-M1 channels?

Accepted Answer

The signals should be out-of-phase (move in opposite directions).

Answer

Both channels should show a positive (downward) deflection.

Answer

The signals should be in-phase (move in the same direction).

Answer

Only the ROC channel should show a deflection.

Question 3

During physiologic calibrations, a flat line is observed in the C3-M2 channel, but the impedance check was low (under 5 kΩ). What is the most likely cause?

Accepted Answer

A salt bridge has formed between the C3 and M2 electrodes.

Answer

The patient is not relaxed enough.

Answer

The M2 electrode has detached from the skin.

Answer

The amplifier gain is set too low.

Question 4

What is the purpose of asking the patient to hold their breath for 5-10 seconds during calibrations?

Accepted Answer

To confirm the function of the respiratory airflow and effort channels.

Answer

To check the function of the EKG electrodes.

Answer

To verify the snoring sensor is working.

Answer

To test the patient's ability to follow commands.

Question 5

To verify the function of the chin EMG channels, what command should the technologist give the patient?

Accepted Answer

Clench your teeth together.

Answer

Blink your eyes five times.

Answer

Take a deep breath.

Answer

Flex your left foot.

Question 6

During EOG calibrations, both the LOC and ROC channels deflect downward simultaneously when the patient looks up. What does this indicate?

Accepted Answer

A possible problem with the reference electrode (M1/M2).

Answer

Correct EOG electrode placement and function.

Answer

The patient is not following instructions correctly.

Answer

The patient has an unusual type of eye movement.