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25 Cards in this Set
- Front
- Back
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path of electrical signal
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brain-electrode-headbox-amplifier-computer-display
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two types of electrode derivations
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referential
bipolar |
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Which signals use DC amplifier?
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oximetry, CPAP, pressure transducer
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the degree of magnification of the amplifier signal
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gain
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measure of the response of an instrument to an incoming signal
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sensitivity
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Ohms law
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V=SD
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a low sensitivity setting produces _____
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a large signal change (deflection)
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fall time constant
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seconds for a square wave to decay to 37% of its maximum amplitude (is determined by LFF)
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minimum sampling rate
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2.5X greater than highest HFF
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charge of cornea
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positive (+)
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charge of retina
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negative (-)
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max signal averaging for pulse oximetry
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3 seconds
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gold standard airflow
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pneumotachometer
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normal ETCO2
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35-45 mmHg
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Score hypoventilation if there is _____
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> 10 mmHG increase in PaCO2 compared to awake supine
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arousal
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abrupt shift of EEG for at least 3 seconds following 10 sec sleep
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arousals scored from ____
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central or occipital
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3 'R's of ECG evaluation
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Rate
Regularity Rhythm |
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3 or more PVCs in a row
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ventricular tachycardia
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Most common type of CSA
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Cheyne-Stokes
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OSA
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drop > 90% of baseline and at least 10 seconds, continued resp effort
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hypopnea
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30% reduction with 4% desat
50% reduction with 3% desat 10 sec |
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RERA
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at least 10 sec of increased resp effort or flattening of nasal pressure leading to arousal
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sensor for apnea
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oronasal thermal
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sensor for hypopnea
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nasal pressure transducer
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