RPSGT Quality Assurance & Improvement 5 — Questions and Answers
Question 1: Which benchmark is used by the AASM to define the minimum acceptable total sleep time (TST) for a technically adequate diagnostic PSG?
- At least 2 hours of total sleep time (Correct answer)
- At least 3 hours of total sleep time
- At least 4 hours of total sleep time
- At least 6 hours of total sleep time
Correct answer: At least 2 hours of total sleep time
The AASM specifies that a diagnostic PSG should capture at least 2 hours of total sleep time to be considered technically adequate for scoring.
Question 2: A night technologist discovers mid-study that the SpO2 signal has been lost and cannot be recovered. What is the BEST course of action?
- Continue the study without SpO2 and note the failure in the report
- Attempt to reapply the sensor; if still unavailable, document all corrective attempts and notify the reading physician (Correct answer)
- Terminate the study immediately and reschedule
- Score the study using chest movement as a surrogate for oxygenation
Correct answer: Attempt to reapply the sensor; if still unavailable, document all corrective attempts and notify the reading physician
Attempting to restore the signal first preserves study integrity, and thorough documentation allows the interpreting physician to appropriately qualify the report.
Question 3: Which QA initiative BEST addresses variation in patient preparation quality across a multi-site sleep center network?
- Allow each site to develop its own preparation protocol
- Standardize patient preparation checklists and conduct cross-site audits to ensure compliance (Correct answer)
- Hire only registered polysomnographic technologists at all sites
- Increase the number of technologists per patient at all sites
Correct answer: Standardize patient preparation checklists and conduct cross-site audits to ensure compliance
Standardized checklists combined with audits create consistent processes across sites and identify sites where the standard is not being followed.
Question 4: What does an oxygen desaturation index (ODI) quality flag on an HSAT report MOST likely indicate for QA purposes?
- The patient has severe sleep apnea requiring urgent CPAP
- The SpO2 signal had excessive artifact, making the ODI unreliable (Correct answer)
- The patient moved excessively during the recording
- The HSAT device malfunctioned and must be returned to the manufacturer
Correct answer: The SpO2 signal had excessive artifact, making the ODI unreliable
An ODI quality flag in HSAT analysis typically indicates that the oximetry signal contained enough artifact to compromise the reliability of the desaturation index calculation.
Question 5: A sleep lab tracks its 'repeat study rate' as a QA metric. A rising repeat study rate MOST likely indicates which quality problem?
- Increasing patient volume without proportional staffing
- Technical quality failures producing non-diagnostic first studies (Correct answer)
- Referral physician preference for multiple studies per patient
- Inadequate follow-up appointment scheduling
Correct answer: Technical quality failures producing non-diagnostic first studies
An increasing repeat study rate suggests that first studies are failing to produce usable diagnostic data, pointing to technical quality problems in acquisition or setup.
Question 6: Which of the following BEST illustrates the concept of 'benchmarking' in a sleep lab quality program?
- Comparing current month's metrics to last month's metrics at the same lab
- Comparing the lab's study adequacy rate to AASM-published national averages or peer-lab data (Correct answer)
- Setting internal performance goals without reference to external data
- Reviewing individual technologist performance against each other within the same lab
Correct answer: Comparing the lab's study adequacy rate to AASM-published national averages or peer-lab data
Benchmarking specifically involves comparing your performance against external standards or peer data to understand how your outcomes relate to the broader field.
Question 7: A sleep lab's QA program identifies that split-night study conversion criteria are inconsistently applied by different technologists. What is the MOST appropriate corrective document to create?
- A new patient consent form specific to split-night studies
- A standardized split-night conversion protocol with clear, objective criteria and a decision flowchart (Correct answer)
- An equipment maintenance checklist for CPAP titration systems
- A revised scoring rule set for split-night studies
Correct answer: A standardized split-night conversion protocol with clear, objective criteria and a decision flowchart
A standardized protocol with objective criteria and a decision flowchart removes ambiguity and ensures all technologists apply the same decision logic for split-night conversion.
RPSGT Quality Assurance & Improvement 5
Which benchmark is used by the AASM to define the minimum acceptable total sleep time (TST) for a technically adequate diagnostic PSG?