Examkin

Soru

Zorluk: OrtaSleep-Wake Disorders

Match each polysomnography (PSG) or Multiple Sleep Latency Test (MSLT) finding to the most appropriate sleep-wake disorder diagnosis.

  • Sustained electromyographic (EMG) tone on chin leads during epochs of rapid eye movements and low-voltage, mixed-frequency EEG.REM Sleep Behavior Disorder
  • Mean sleep latency of 6 minutes and two sleep-onset REM periods (SOREMPs) across five daytime nap opportunities.Narcolepsy
  • Recurrent episodes of absent airflow lasting >10 seconds without associated thoracic or abdominal respiratory excursions.Central Sleep Apnea
  • Apnea-hypopnea index of 25 events per hour characterized by absent airflow with paradoxical inward rib cage and outward abdominal movements.Obstructive Sleep Apnea

Cevap

Sustained EMG tone during REM matches REM Sleep Behavior Disorder; early REM onset and shortened sleep latency on MSLT matches Narcolepsy; absent airflow without respiratory effort matches Central Sleep Apnea; and absent airflow with paradoxical respiratory effort matches Obstructive Sleep Apnea.
Polysomnography (PSG) and the Multiple Sleep Latency Test (MSLT) provide objective measures to diagnose specific sleep-wake disorders. REM sleep behavior disorder is characterized by a lack of normal muscle atonia during REM sleep, observed as sustained EMG tone. Narcolepsy is objectively diagnosed on MSLT by a sleep latency of 8 minutes or less and 2 or more SOREMPs. Sleep apnea syndromes are differentiated by respiratory effort during apneic events: effort is present in obstructive sleep apnea (causing paradoxical chest and abdominal movements) and absent in central sleep apnea.

Adım Adım Çözüm

1
Analyze the first finding of sustained EMG tone during REM sleep.
This indicates a loss of normal REM sleep muscle atonia.
Loss of REM atonia is the key diagnostic finding for REM sleep behavior disorder, explaining dream enactment behaviors.
2
Analyze the MSLT finding of a 6-minute sleep latency with two SOREMPs.
These findings show objective hypersomnolence and premature entry into REM sleep.
These are the pathognomonic diagnostic criteria for narcolepsy.
3
Analyze the finding of absent airflow without thoracic or abdominal excursions.
This indicates an absence of respiratory drive during the apneic event.
A lack of respiratory effort during apneic episodes defines central sleep apnea.
4
Analyze the finding of absent airflow with paradoxical inward rib cage and outward abdominal movements.
This indicates continued respiratory effort against a closed upper airway.
Respiratory effort against an obstructed airway is the hallmark finding of obstructive sleep apnea.

Anahtar Kavram

Differentiating sleep-wake disorders based on pathognomonic polysomnography and MSLT findings
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Konular

Sleep-Wake Disorders

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