What is derivation
Specific signal from a pair of electrodes
What is a montage
An arrangement of derivations
What is an official example of a referential derivation
EEG; exploring electrode
What is an example of a bipolar derivation
Chin electromyogram; references off one another
What is the cornea charge
Positive
What is the retina charge
Negative
How is the electrical signal traced for a EOG
Referenced to opposite mastoid
What deflection is seen when the right eye looks told the electrode
A negative deflection representing positive charge
What kind of derivation is for a chin electromyogram
Bipolar-reference 2 electrodes
Where are the electrode placed during chin electromyogram
Mental and usually two sub-mental (one spare)
What is monitored during chin electromyogram
Bruxism
Snoring
Arousals
GERDs
Where is leg EMG placed
Anterior tibialis or extensor digitorum
What measures respiratory effort
Strain gauge-detects circumference changes
Inductance plethysmography bands-measures changes in circumference
Piezo-crystal bands-when placed under stress, generates voltage
Intercostal or diaphragmatic EMG-depolarization & repolarization is detected
How is the position sensor attached
Attach to resp. Belt, sternum, or head
Contain mercury-activated switches
How is obstructed sleep apnea detected with belt
The belt measures respiratory effort and there is paradoxical breathing w/ obstructed apnea
What are the airflow sensors
Thermocouple
Thermistor
Pressure transducer
Polyvinylindene
Where is the snoring sensor placed
Lateral to the laryngeal prominence
What percent is Fp from Nasion
10%
What percent is Fp from Fz
20%
What percent is Fz from Cz
20%
What percent is Cz from Pz
20%
What percent is Pz from O
20%
What percent is O from inion
10%
What percent is T3 from C3
20%
