RPSGT Technology & Tools 3

Question 1

What is the minimum recommended sampling rate for EEG signals in digital PSG according to AASM guidelines?

Accepted Answer

256 Hz

Answer

AASM recommends a minimum sampling rate of 256 Hz for EEG to adequately represent frequencies up to 35 Hz per Nyquist theorem.

Question 2

A nasal pressure transducer is preferred over a thermistor for detecting hypopneas because it:

Accepted Answer

Better detects flow limitation via waveform flattening

Answer

Nasal pressure transducers detect the characteristic flow-limited flattened waveform that precedes and defines many hypopneas better than thermistors.

Question 3

Piezoelectric effort belts used in PSG measure respiratory effort by detecting:

Accepted Answer

Mechanical strain causing voltage changes

Answer

Piezoelectric belts generate a voltage proportional to mechanical strain (stretching/compression) from thoracoabdominal movement.

Question 4

During a split-night PSG, CPAP titration should begin when which criterion is met?

Accepted Answer

RDI ≥ 10 events/hr after at least 2 hours of diagnostic recording

Answer

AASM criteria require an RDI ≥ 10 events/hr after a minimum of 2 hours of diagnostic recording before initiating CPAP titration in a split-night study.

Question 5

Which CPAP device feature automatically adjusts pressure breath-by-breath based on detected flow limitation?

Accepted Answer

Auto-titrating CPAP (APAP)

Answer

APAP devices use algorithms analyzing flow signals to continuously adjust pressure in response to detected apneas, hypopneas, snoring, and flow limitation.

RPSGT Exam Practice Test

RPSGT Exam Practice Test

RPSGT Technology & Tools 3