RPSGT Practice Test

Sample Questions and Answers

Question 1. During an overnight polysomnography study, a sleep technologist notices repeated episodes of airflow reduction accompanied by oxygen desaturation and increased respiratory effort. Which finding most strongly suggests obstructive sleep apnea rather than central sleep apnea?

A. Absence of respiratory effort during each event.

B. Continued respiratory effort despite reduced or absent airflow.

C. Normal airflow throughout the recording.

D. Increased muscle tone during REM sleep.

Correct Answer: B. Continued respiratory effort despite reduced or absent airflow.

Explanation:
Obstructive sleep apnea occurs when the upper airway becomes partially or completely blocked despite continued respiratory effort by the patient. During polysomnography, respiratory effort is typically observed through thoracic and abdominal movement while airflow is measured separately. In contrast, central sleep apnea is characterized by the absence of both airflow and respiratory effort because the brain temporarily fails to send appropriate signals to the respiratory muscles. Correctly distinguishing between obstructive and central respiratory events is essential for accurate scoring, diagnosis, and treatment planning. This concept is fundamental to sleep medicine and is frequently assessed on the RPSGT certification examination.

Question 2. Before beginning an overnight sleep study, a Registered Polysomnographic Technologist performs equipment calibration and verifies that every physiologic signal is being recorded correctly. What is the primary purpose of completing this process before the patient falls asleep?

A. To shorten the duration of the sleep study.

B. To ensure accurate, reliable data collection and identify technical problems before recording begins.

C. To improve the patient’s sleep quality by reducing monitoring channels.

D. To eliminate the need for technician observation during the study.

Correct Answer: B. To ensure accurate, reliable data collection and identify technical problems before recording begins.

Explanation:
Equipment calibration is an essential quality assurance procedure in polysomnography. Proper calibration confirms that physiologic signals such as EEG, EOG, EMG, ECG, airflow, respiratory effort, and oxygen saturation are functioning correctly before data collection begins. Identifying technical problems early helps prevent signal loss, inaccurate recordings, and interruptions that could compromise the interpretation of the sleep study. Accurate physiologic data are critical for identifying sleep stages, respiratory events, limb movements, cardiac abnormalities, and other clinically significant findings. Reliable recordings support accurate scoring, diagnosis, and appropriate patient management.

Question 3. During a sleep study, a patient’s oxygen saturation decreases repeatedly following prolonged respiratory events. What is the most appropriate responsibility of the sleep technologist during the recording?

A. Ignore the oxygen desaturation if the patient remains asleep.

B. Continue monitoring the patient carefully, follow established laboratory protocols, and document significant events appropriately.

C. End the sleep study immediately without notifying anyone.

D. Remove the monitoring equipment because oxygen saturation has decreased.

Correct Answer: B. Continue monitoring the patient carefully, follow established laboratory protocols, and document significant events appropriately.

Explanation:
Patient safety remains the highest priority throughout every polysomnography study. Sleep technologists are responsible for continuously monitoring physiologic signals, recognizing clinically significant events, following laboratory protocols, documenting abnormal findings, and responding appropriately according to established procedures. Careful observation ensures that important respiratory events, oxygen desaturation episodes, cardiac rhythm changes, and other abnormalities are accurately recorded for physician interpretation. Proper documentation and adherence to professional standards help ensure that the sleep study provides reliable clinical information while maintaining a safe environment for the patient throughout the recording.

Question 4. A patient undergoing CPAP titration continues to experience obstructive respiratory events despite increasing pressure settings according to the laboratory protocol. What should the sleep technologist do next?

A. Continue following the approved titration protocol while monitoring the patient’s response and documenting all pressure adjustments.

B. Discontinue the study immediately.

C. Select pressure settings based solely on personal preference.

D. Ignore the remaining respiratory events because treatment has already started.

Correct Answer: A. Continue following the approved titration protocol while monitoring the patient’s response and documenting all pressure adjustments.

Explanation:
CPAP titration studies are performed according to established laboratory protocols that guide pressure adjustments based on observed respiratory events, oxygen saturation, sleep stage, body position, and patient response. Sleep technologists should carefully monitor the effectiveness of each pressure change while documenting all adjustments and relevant clinical observations. Consistent application of standardized protocols helps optimize treatment effectiveness, improves patient comfort, and provides valuable information for interpreting physicians. Following approved titration procedures also promotes patient safety and ensures the study produces accurate, clinically meaningful results.

Question 5. While reviewing a completed polysomnography recording, a sleep technologist observes changes in EEG activity, eye movements, and muscle tone that indicate a transition into rapid eye movement (REM) sleep. Which additional physiologic characteristic is commonly associated with normal REM sleep?

A. Increased skeletal muscle tone throughout the body.

B. Generalized skeletal muscle atonia with the exception of eye and respiratory muscles.

C. Complete absence of eye movements.

D. Continuous voluntary body movement throughout the sleep period.

Correct Answer: B. Generalized skeletal muscle atonia with the exception of eye and respiratory muscles.

Explanation:
Rapid eye movement (REM) sleep is characterized by rapid eye movements, low-amplitude mixed-frequency EEG activity, vivid dreaming, and generalized skeletal muscle atonia. This temporary reduction in muscle activity prevents most voluntary body movements during dreaming while allowing essential functions such as breathing and eye movement to continue. Correct identification of REM sleep is important because many sleep disorders, respiratory abnormalities, and parasomnias demonstrate different characteristics during this stage. Understanding normal sleep architecture and accurately identifying sleep stages are fundamental responsibilities of Registered Polysomnographic Technologists and are important areas tested on the RPSGT certification exam.