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Polysomnography
The gold standard sleep study
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What is polysomnography (PSG)?
PSG is a sleep study based of o physiologicalparameters Can be
used to measure sleep and diagnose
certain sleeping disorders
Diferent types can be done at home or in a sleeplab Usually at
least three nights in sleep lab as rst
one night or two are not used so the patient canadjust
There are two sets o rules deeloped orinterpreting the results
!n "#$% &echtschafen and 'ales set
the standard
The (merican (ssociation o Sleep)edicine reised them in *++,
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What does a PSG measure?
( ull PSG measures # diferent signals --G .electroencephalogram/
0 1rain actiity -2G .electrooculogram/ 0 -ye moements Sp2* 23ygen
Saturation4 basically the amount o
o3ygen you hae &espiratory efort &espiratory air5ows
Position
Snoring -CG .electrocardiogram/6 7eart beat -)G .electromyogram/
0 body
moements . leg and chin specically/
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8hat it can loo9 li9e to get a
PSG:
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Do we need all those wires?
The absolute minimum o electrodes or a ullPSG set up is about
"*: Three --G
Two -2G Two -)G 2ne air5ow 2ne or -CG
2ne or 23ygen saturation Two respiratory efort belts
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Why do we want to know this?
8e can get seeral things rom this data; Sleep onset latency 0
how long it ta9es to allasleep
Sleep stages 0 how long was spent in each stageo sleep
1reathing irregularities 0 i you hae sleep apnea: 8e can compare
the data rom the PSG to the
datagathered rom the bed sensor suit 8e can test and optimi
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How can we get this data?
7ere are our options;
8e should get this; Cadwell -asy !!
Cheap &eliable Popular
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References 1erry4 &ichard et al: .*+"*/:A The AASM Manual
for the scoring of Sleep and Associated Events:
Rules Terminology and Technical Specications, Version 2!:
Darien4 !?; (merican (cademy o Sleep)edicine
&echtschafen4 (: @ 'ales4 (: .-ds:/ ."#$%/:A manual of
standardi"ed terminology, techni#ues, andscoring system for sleep
stages of human su$%ects: 8ashington D:C:; Public 7ealth Serice4
U:S:Goernment Printing Serice
D: )oser4 P: (nderer4 G: Gruber4 S: Parapatics4 -: ?oret
