RPSGT Exam Pediatric Sleep Study Scoring — Questions and Answers
Question 1: According to AASM guidelines, how is an obstructive apnea defined in a pediatric patient, as opposed to the adult definition?
- A cessation of airflow lasting ≥ 10 seconds with continued respiratory effort
- A cessation of airflow lasting ≥ 20 seconds with continued respiratory effort
- A cessation of airflow lasting ≥ 2 missed breaths with continued respiratory effort (Correct answer)
- Any drop in airflow of ≥ 90% for ≥ 5 seconds with respiratory effort
Correct answer: A cessation of airflow lasting ≥ 2 missed breaths with continued respiratory effort
In pediatric scoring, an obstructive apnea is defined as cessation of oronasal airflow for a duration of at least 2 missed breath cycles, with continued chest and abdominal respiratory effort. This differs from the adult definition (≥10 seconds), because children breathe faster and a 10-second pause may encompass many respiratory cycles.
Question 2: In infants, what is the term for the sleep state that is the developmental equivalent of REM sleep, characterized by irregular breathing, eye movements, and low muscle tone?
- Quiet sleep
- Transitional sleep
- Active sleep (Correct answer)
- Indeterminate sleep
Correct answer: Active sleep
In neonates and young infants, sleep is classified as active sleep (equivalent to adult REM), quiet sleep (equivalent to adult NREM), and indeterminate/transitional sleep. Active sleep is characterized by irregular breathing, rapid eye movements, occasional body movements, and low chin EMG tone — mirroring REM sleep features.
Question 3: The diagnostic threshold for obstructive sleep apnea in children differs from adults. What AHI value is considered abnormal in a pediatric patient?
- AHI ≥ 5 events/hour
- AHI ≥ 15 events/hour
- AHI ≥ 10 events/hour
- AHI ≥ 1 event/hour (Correct answer)
Correct answer: AHI ≥ 1 event/hour
AASM guidelines define pediatric OSA as an AHI ≥ 1 obstructive event per hour of sleep, compared to the adult threshold of ≥ 5 events/hour. Children normally have very few respiratory events, so even one obstructive apnea or hypopnea per hour is considered clinically significant and requires evaluation.
Question 4: Periodic breathing in a pediatric PSG is considered clinically significant when it accounts for more than what percentage of total sleep time?
- 1%
- 3%
- 5% (Correct answer)
- 10%
Correct answer: 5%
AASM pediatric scoring defines periodic breathing as ≥3 sequences of central apnea lasting >3 seconds each, separated by ≤20 seconds of normal breathing. It becomes clinically significant when it occupies more than 5% of total sleep time, at which point it is associated with pathological central respiratory control instability.
Question 5: When scoring respiratory events in infants younger than 1 year, which type of apnea is considered a normal physiological finding?
- Obstructive apnea lasting more than 10 seconds
- Mixed apnea of any duration
- Central apnea lasting ≤ 20 seconds without associated desaturation or bradycardia (Correct answer)
- All central apneas are pathological regardless of duration
Correct answer: Central apnea lasting ≤ 20 seconds without associated desaturation or bradycardia
Brief central apneas (≤20 seconds) without associated oxygen desaturation or bradycardia are physiologically normal in infants, reflecting immature respiratory control. They become pathological when they exceed 20 seconds in duration or are accompanied by oxygen desaturation or significant bradycardia, which may indicate apnea of prematurity or other disorders.
Question 6: According to AASM pediatric scoring rules, a hypopnea must include a peak signal excursion drop of at least what percentage from baseline, associated with either an arousal or a ≥ 3% oxygen desaturation?
- 10%
- 20%
- 30% (Correct answer)
- 50%
Correct answer: 30%
The AASM recommended pediatric hypopnea definition requires a ≥ 30% drop in the peak oronasal thermal sensor or nasal pressure signal excursion from baseline, associated with either an arousal or a ≥ 3% oxygen desaturation. This 30% threshold is the same as the AASM recommended adult rule.
RPSGT Exam Pediatric Sleep Study Scoring
According to AASM guidelines, how is an obstructive apnea defined in a pediatric patient, as opposed to the adult definition?