RPSGT Technology & Tools 5

Question 1

Which artifact is characterized by a 60 Hz sinusoidal pattern superimposed on PSG channels and is MOST commonly caused by:

Accepted Answer

Alternating current (AC) electrical interference from nearby devices

Answer

60 Hz artifact (50 Hz outside North America) is caused by AC electrical interference from power lines, fluorescent lights, or nearby electrical devices.

Question 2

During PSG, a technologist observes rhythmic, saw-tooth appearing artifact in the ECG channel that correlates with the patient's respiratory rate. This is MOST likely:

Accepted Answer

Respiratory baseline wander from electrode movement

Answer

Respiratory baseline wander in the ECG channel is caused by chest movement altering electrode-skin impedance rhythmically at the breathing rate.

Question 3

CPAP heated humidification is used primarily to:

Accepted Answer

Prevent nasal dryness and improve CPAP adherence

Answer

Heated humidification adds warmth and moisture to the delivered air, reducing mucosal drying and irritation which are major causes of CPAP non-adherence.

Question 4

A full-face mask (oronasal mask) is typically indicated over a nasal mask when a patient:

Accepted Answer

Is a confirmed mouth breather or has significant mouth leak

Answer

Mouth breathing or significant mouth air leak with nasal masks causes pressure loss and therapy ineffectiveness, making an oronasal mask the appropriate interface.

Question 5

Which signal processing technique is used by APAP devices to distinguish true apneas from mask leak artifacts?

Accepted Answer

Proprietary algorithms analyzing flow signal shape, amplitude, and timing patterns

Answer

APAP devices use proprietary algorithms that analyze flow signal morphology, amplitude, timing, and response patterns to differentiate true respiratory events from leaks.

RPSGT Exam Practice Test

RPSGT Exam Practice Test

RPSGT Technology & Tools 5