More Sleep Studies Flashcards
(16 cards)
Clinical significance of overlap syndrome
More likely to develop respiratory failure
What is obesity hypoventilation syndrome
Underbreathing due to weight from obesity
Increase CO2
what is upper airway syndrome
Pt wakes due to increased resp efforts and HR
Poor quality sleep may benefit from CPAP
AHI ranges in OSA
<5 normal
5 - 15 mild
15-30 mod
>30 severe
Sleep related movement disorders
Restless legs
Periodic limb movement disorders(PLMD)
What results might you get from pulse oxim test
Decreased sats due to apnoeas
Increase pulse suggest arousal or restless legs
O2 desat index (ODI) decrease >3% per hour
TS90% (sig if >30% of night)
Pulse rises (>6 bpm)
How to tell overlap syndrome compared to normal OSA on a pulse oxim
Sat starts low and rarely return back to baseline during sleep
Limitations of pulse oxim
If testing sats are high and really large decrease in pO2 if required to produce a significant decrease and visa versa
Only appropriate for specific populations
Where is resp polygraphy conducted
At home
What is the airflow cannula used for in a poly
Assess airflow and measure hypopneas and apnoeas
What is measured in polygraphy
Airflow
Resp efforts (using bands)
Snore
HR
Sats
Normal poly airflow
Regular pattern shows clear insp and exp
Abnormal flow in poly
Pauses in airflow observed with decreased in sats and slightly reduced resp efforts
Difference between CSA and OSA on a poly
Complete cessation of respiratory effort is seen in CSA
Sleep stages on polysomnography
Stage 1 (eye rolling)
Stage 2 (K complexes, sleep spindles)
Stage 3 (delta waves, slow big EEG)
REM (big rapid eye movements, EMG shows low amplitude)
What is measured in polysomnography
EEG (brain)
EOG (eyes)
EMG ( muscle tone, likely of Lowe leg)
