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WorksheetsINTRO TO POLYSOMN & CHANELS
Total questions: 50
Worksheet time: 25mins
A patient on PSG shows frequent arousals but no oxygen desaturation. What channel should the technologist check next?
Oxygen saturation
EEG
Nasal airflow
A patient undergoing Level III sleep study must have at least which parameters?
EEG and video
Airflow, oximetry, chest effort
Leg EMG
A technologist notes paradoxical chest and abdominal movement during apnea. What is this?
Central apnea
Obstructive apnea
Complex apnea
During PSG, the technologist increases low-frequency filter to 1 Hz. Why?
To reduce sweating artifacts
To detect apnea better
To amplify K-complexes
A patient’s EEG shows K-complexes with spindles. Which stage of sleep is this?
N1
N2
N3
A patient with obesity hypoventilation syndrome is suspected. Which channel provides best supporting data?
Body position
Capnography
ECG
A PSG shows apnea without thoracic effort. What type of apnea is this?
Central
Obstructive
Mixed
During HST, nasal airflow sensor detaches. Which parameter becomes unreliable?
Oximetry
Airflow
ECG
A PSG shows bursts in anterior tibialis EMG during sleep. What condition is likely?
REM behavior disorder
Periodic limb movement disorder
Central apnea
A patient with suspected nocturnal GERD requires which additional channel?
Esophageal pH monitoring
Chin EMG
Nasal airflow
A technologist observes artifacts caused by impedance difference between electrodes. What should be done?
Reapply electrode paste
Increase sampling rate
Switch to chest leads
A PSG shows apnea events only in REM sleep. What does this suggest?
Central apnea
REM-related OSA
PLMS
A patient with seizures is referred for PSG. Which setup is most important?
Extended EEG montage
Video infrared camera
Chin EMG only
A patient shows improved oxygenation after PAP titration but continues to arouse. What is the next adjustment?
Increase PAP pressure
Decrease PAP pressure
End titration early
Which parameter distinguishes PLMS from EEG arousal?
Chin EMG
Leg EMG
EOG
A technologist sees downward deflections on EEG. Conventionally, this indicates:
Negative polarity
Positive polarity
Artifact
A patient’s ECG shows distortion from muscle activity. What adjustment reduces this?
Use differential amplifier
Increase gain
Remove airflow sensors
A patient with apnea events but stable SpO₂ most likely has:
Central apnea with preserved oxygenation
Severe OSA
PLMS disorder
A PSG shows mixed apnea. Which feature defines this?
Starts as central, ends obstructive
Both apnea and hypopnea
Always occurs in REM
A technologist suspects nocturnal parasomnia. Which recording is most valuable?
Nasal airflow
Infrared video
Chin EMG
A patient’s EEG shows high-amplitude slow waves and low EMG tone. What sleep stage is this?
N2
N3
REM
A PSG shows REM without atonia in chin EMG. What is the diagnosis?
Narcolepsy
REM behavior disorder
PLMS
A PSG reveals stable EEG but frequent desaturations. What should be checked next?
ECG
Thoracic and abdominal belts
Chin EMG
A PSG technologist finds frequent power line interference at 60 Hz. Which filter corrects this?
Low-frequency
Notch filter
High-frequency
A patient undergoing HST fails due to frequent sensor detachment. What is the best prevention?
Increase sampling rate
Patient education on sensor placement
Use extended EEG montage
A PSG shows airflow reduction with oxygen desaturation and increased respiratory effort. What type of event is this?
Central hypopnea
Obstructive hypopnea
Mixed apnea
A patient’s EOG electrodes detect corneal-positive deflections. What does this signify?
Sleep spindles
Eye movements
PLMS bursts
A technologist increases high-frequency filter on EEG channels. What is the purpose?
Reduce sweat artifact
Reduce muscle artifact
Enhance slow waves
A PSG shows chin EMG bursts during REM sleep. What condition is indicated?
Narcolepsy
REM behavior disorder
Central apnea
During titration, CPAP causes new-onset central apneas. What is this called?
Mixed apnea
Complex sleep apnea
PLMS disorder
A patient’s ECG shows arrhythmia during desaturation. Which channel combination is most useful?
EEG + EMG
ECG + SpO₂
EOG + airflow
A PSG shows apnea events with paradoxical thoracic and abdominal movements. This indicates:
Central apnea
Obstructive apnea
Seizure activity
A patient with suspected seizures needs which additional monitoring during PSG?
Leg EMG
Extended EEG
Capnography
A home sleep test report is negative, but patient remains highly symptomatic. What should be done?
Prescribe CPAP immediately
Repeat in-lab PSG
Use video recording only
A PSG shows high-amplitude slow waves and spindles are absent. Which stage is this?
N2
N3
REM
A patient’s airflow sensor fails. What alternative should be used?
Pressure transducer
Video infrared camera
Body position sensor
A PSG shows apnea with no airflow or chest effort. What type of apnea is this?
Obstructive
Central
Mixed
A patient has recurrent desaturations only during REM sleep. This suggests:
PLMS disorder
REM-related OSA
Central apnea
A PSG technologist applies skin prep before electrode placement. What is the main reason?
To reduce sweating
To lower impedance
To amplify EEG
A patient’s PSG shows frequent leg EMG bursts every 25 seconds. What is the likely diagnosis?
REM behavior disorder
Periodic limb movement disorder
Narcolepsy
A technologist notes that both EEG inputs show equal potentials. What will the amplifier output be?
Positive deflection
Zero signal
Negative deflection
A PSG reveals sleep onset in 3 minutes and multiple SOREMPs. What is the likely diagnosis?
OSA
Narcolepsy
Insomnia
A patient with severe OSA cannot tolerate high CPAP pressures. What adjustment is best?
Reduce pressure permanently
Switch to BiPAP
Stop PAP therapy
A PSG technologist identifies movement artifacts contaminating EEG. Which step helps most?
Tighten headgear
Reapply electrode gel
Increase sampling rate
A PSG reveals abnormal movements with normal EEG and airflow. Which disorder is likely?
Parasomnia
OSA
PLMS
A PSG shows apnea beginning as central then progressing to obstruction. What type is this?
Mixed apnea
Complex apnea
Central apnea
A patient suspected of OSA undergoes PSG with PAP titration. Which channel confirms therapeutic pressure adequacy?
Nasal airflow
Chin EMG
EOG
A PSG technologist detects continuous 60 Hz artifact. Which filter should be applied?
Notch filter
High-frequency filter
Low-frequency filter
A patient has stable EEG but frequent arousals with PLMS. Which finding confirms diagnosis?
Nasal airflow reduction
Repetitive leg EMG bursts
EOG spikes
A PSG shows stable sleep but rising transcutaneous CO₂ levels. What condition is suggested?
PLMS disorder
Hypoventilation
Narcolepsy
