Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
99 Cards in this Set
- Front
- Back
|
which of the following filter settings are most appropriate for these channels:EEG,EOG,EKG,EMG
|
EEG:0.3/35
EOG:0.1/35 EKG:1.0/35 EMG:10/70 |
|
|
The low frequency filter is used for
|
eliminating unwanted slow frequencies
|
|
|
If the ROC channel on psg is 5 and the LOC channel is 6,what will it look like when the patient looks up
|
move toward each other
|
|
|
what is the best solution for disinfecting electrodes
|
bleach
|
|
|
what should the tech do first to make surre the proper test is being preformed
|
review the chart for the docs orders
|
|
|
a polysomnograph records what
|
electric potentials from body
voltages from other devices output signal from auxilliary equipment |
|
|
which is not a bioelectric potential recording:
EOG,EMG,RESPIRATORY AIRFLOW,EKG |
respiratory airflow
|
|
|
what is the function of the differential amplifier
|
to record the differences between two signal inputs
|
|
|
what is it when you select 2 signal inputs applied to a differential amplifier and assigned to a specific channel
|
a recording montage which shows which signals will be displayed in which channels
|
|
|
G1 represents what
|
the first signal inpput into a differential amplifier
|
|
|
if G1 recieves an input of -100uv and G2 recieves 50uv, what is the output voltage
|
-50uv, subtracting G2 form G1
|
|
|
if G1 recieves -50uv, and G2 recieves +50uv, it equals what
|
-100uv
|
|
|
if G1&G2 both recieve an input of -50uv what is the output
|
0
|
|
|
how can you determine the frequency of an EEG signal
|
by counting the cycles of the wavein one second
|
|
|
frequency is measured how
|
in cycles per second, or hertz(Hz)
|
|
|
how do you determine the amplitude of an EEG signal
|
by comparing the height of the recorded waveform against a calibration signal of known value
|
|
|
the amplitude of a wave is a measure of
|
voltage
|
|
|
a low frequency filter is used to
|
eliminate unwanted slow frequencies
|
|
|
a high frequency filter is used to
|
eliminate unwanted fast frequencies
|
|
|
sensitvity
|
ratio of input voltage to the amplitude of the pen deflection
|
|
|
an appropriate EEG gain setting
|
5uv/mm and 50uv/cm ( they are the same)
|
|
|
If an EEG amplifier is calibrated to 50uv/cm, a
-75uv signal should do what |
a negative signal produces an upward pen deflection, while a positive signal produces a downward pen deflection
|
|
|
an equalizer or gain control is used to
|
make fine adjustments to the sensitivity of an amplifier
|
|
|
the standarded paper speed used in PSG is
|
10 mm/sec. which produces 30 second epochs
|
|
|
what is the proper setting for recording the EEG:LFF=10hz,HFF=100hz
LFF=1hz,HFF=30hz LFF=.3hz,HFF=30hz LFF=.1hz,HFF=.5hz |
LFF=.3hz,HFF=30hz or
LFF=1hz,HFF=30hz |
|
|
what is the proper setting for recording the EMG
|
LFF=10hz,HFF=100hz
*the HFF can be set at 70hz to off and the LFF at or close to 10hz |
|
|
what is the proper setting for recording respiratory effort and airflow
|
LFF=.1hz,HFF=.5hz *usually the HFF would be set a little higher
|
|
|
if the high frequency filter is 15 hz to record the EEG, how could this damage the info on the PSG
|
the 15 hz HFF setting could attenuate certain types of abnormal fast frequency, (seizure spikes), and alpha activity
|
|
|
a major difference between an AC&DC amplifier is
|
AC has a high frequency filter while DC amplifier doesn't
|
|
|
the overall quality and accuracy of a sleep study is primarily determined by
|
proper electrode application and recording methodology
|
|
|
a bio-calibration routine is use dto
|
establish a baseline scoringreference for study,verify correct signal derivations, confirm the integritiy of derived signals
|
|
|
in PSG, the recording of the eye movements is based on
|
the electrical potential difference betweeen the cornea and the retna of each eye,* if the patient looks toward the electrode, the wave produced will be positive, (downward)deflection
|
|
|
according to polarity convention, an eye movement to the right should result in
|
a downward pen deflection in the ROC channel and an upward pen deflection in the LOC channel
|
|
|
if the low freq.filter is raised from .3 hz to 1 hz in an eeg channel what will happen on the recording
|
the 1 hz setting will reduce the amplitude of slow delta waves
|
|
|
amplitude is the measurement of the, and is measured in
|
height of the wave,microvolts
|
|
|
frequency is the measurement of the ,and measured in
|
speed of the wave,hertz
|
|
|
sensitivity can be explained in what equation
|
sensitivity =voltage/pen deflection
|
|
|
the low frequency filter is most related to the
|
time constant
|
|
|
the electro-occulogram is the recording for what
|
the corneo-retinal potential difference
|
|
|
the rapid eye movement in REM sleep is detectable in the EOG of blind patients if what is normal
|
the corneo-retinal potential,which is the same for all pt.
|
|
|
electro-occulogram measures
|
the difference between the positive electrical charge in the cornea and the negative charge in the retina
|
|
|
what is the recommended impedance for EEG electrodes
|
less then 5,000(5k), lower the better
|
|
|
EEG signals recorded in the lab originate from
|
action potentials of neurons
|
|
|
polysomnography includes all but which measurements,
EMG,ERG,Respiratory,EOG |
ERG,the retina
|
|
|
the distance between the nasion to the inion is 36cm, what is the distance from Cz to Pz
|
7.2 cm , Cz to Pz is 20% of the total distance from the nasion to the inion.
|
|
|
the distance between the nasion to the inion is 32 cm,what is the distance from inion to Oz
|
3.2 cm, The inion to Oz is 10% of the distance from the inion to the nasion
|
|
|
The distance from ear to ear is 40 cm, what is the distance from Cz to C3
|
8.0cm, Cz to C3 is 20% of the distance from ear to ear, 20% of 40cm is 8.0cm
|
|
|
the distance from Cz to T4 is 14cm, what is the distance from C4 to T4
|
7.0cm, C4 is halfway between Cz and T4, so half of 14 is 7
|
|
|
The total circumference of the head is 56cm,what is the distance from Oz to O1
|
2.8cm, OZ to O1 is 5% of the total circumference of the head
|
|
|
the total o circumference of the head is 60cm, what is the distance from O2 to T4
|
12.0,O2 to O4 is 205 of the total circumference of the head,20% of 60 is 12
|
|
|
What electrode site is half the distance from T5 to Pz
|
P3,which is located half way between T5 and Pz
|
|
|
What electrode site is half the distance from O1 to T3
|
T5, which is located half way from O1 and T3
|
|
|
What electrode site is half of the distance fromF8 to Fz
|
F4, which is half way
|
|
|
the distance from Fp1 through C3 to O1 is 24cm, what is the distance from C3 to P3
|
6.0cm,C3 to P3 represents 25% of this measurement
|
|
|
What electrode site is half way between Fp2 and C4
|
F4
|
|
|
The total circumference of the head is 50cm, what is the distance from T3 to Oz
|
12.5cm, T3 to Oz is 25% of the total circumference of the head
|
|
|
the distance from Fp2 to T4 is 10cm, what is the distance from Fp2 to F8
|
5.0cm, half of 10 is 5
|
|
|
what electrode site is half the distance from T3 to T4
|
Cz is located half way
|
|
|
G1=60uV,G2=10uV, what is the total output voltage
|
50 uV, 60-10
|
|
|
Which of these is a DC channel
|
SpO2
|
|
|
what type of wire is best for recording the EEG activity
|
gold cups, lower impedence, great fit on the scalp
|
|
|
The rate at which a wave repeats itself or osccillates is
|
frequency
|
|
|
what is the disadvatage to using gold cups
|
increased cost
|
|
|
a change in sensitivity produces a change in
|
the height of the wave
|
|
|
the amplitude of an EEG wave is generally measured in
|
microvolts(uV)
|
|
|
cycles per second is synonymous with
|
Hertz(Hz)
|
|
|
the frequency of a waveform can be altered by changing
|
the filters
|
|
|
changing the sensitivity setting from 20uV/mm to 40uV/mm will do what to the wave
|
cut it in half
|
|
|
what is the best LFF setting for an EEG channel
|
0.5Hz, is recommended
|
|
|
what is the best HFF setting for an EMG channel
|
70Hz
|
|
|
what is the best HFF setting for an EEG channel
|
35Hz
|
|
|
what is the best HFF setting for a respiratory channel
|
5.0Hz
|
|
|
the shape of the wave matters most for which: EMG,EEG,Sp02,body postion
|
EEG, detail helps in determining sleep stages
|
|
|
what is the best sensitivity setting for an EEg channel
|
70uV/mm(7uV/mm),is best ,for pts. with low amplitude it should be changed to 50uV/mm(5)
|
|
|
which montage includes the full EEG hookup to rule out seizure activity
|
REM behavior disorder
|
|
|
which montage includes extra eye hookups,above and below the eye
|
MSLT,staging is very important, extra eye leads increase EOG reliability
|
|
|
what montage usually includes a pressure channel and additional flow channel
|
CPAP
|
|
|
what montage is most commonly used for overnite diagnostic studies
|
Baseline, used in diagnosing common sleep disorder,OSA & PLMS
|
|
|
polysomnography is the study of
|
physiologic parameters as they relate to sleep
|
|
|
what %of the total circumference of the head is T5 away from T3
|
10%
|
|
|
what 2 muscles should the chin EMG be placed over
|
mentalis and submentalis, above and below the chin line
|
|
|
what electrod esite is not used in a baseline study:
leg EMG,ROC,arm EMG,thoracic belt |
arm EMG, are used in REM behavior disorders
|
|
|
the exploring electrode recieves a voltage of -20uV,the output voltage is 50uV,what voltage did the refence electrode recieve at this time
|
-70uv,out put voltage is = to the exploring electrodes voltage - the reference electrodes voltage(-20-70,or-20+70=50)
|
|
|
what muscle should the leg EMG electrode be placed on
|
anterior tibialis,runs along the outside of the shin bone
|
|
|
the recording of electrical activity generated by the eyes is abbreviated
|
EOG,electro-occolography
|
|
|
G1=-25uV,G2=-25uV, what is the output voltage
|
0uV,when the inputs are identical thery cancel each other out
|
|
|
which electrode is 20% of the horizontal measurement of the head to the left of Cz (pre-auricular point to pre-auricular point)
|
C3
|
|
|
if the montage has the ROC as channel 5 and the LOC as channel 6, what will the waves on these channels do when the pt. looks up
|
move toward each other,looking up causes aa positive charge for ROC and neg. for LOC,so, ROC goes down and LOC goes up,moving towards each other
|
|
|
G1=-80uV the output is 20uV what is the voltage at G2
|
-100uV,(-80--100,is also-80+100) which is equal to the output voltage of 20uV
|
|
|
what electrode site is half the distance fromFp2 to T4
|
F8
|
|
|
what % of the entire vertical measurement of the head is Pz away from the inion
|
30%, Oz is 10% of this distance from the inion,Pz is another 20%,making it 30%
|
|
|
G2=-70uV,output is 15uV,what is the voltage in G1
|
-55uV,(-55--70 = -55+70)
|
|
|
the distance from ear to ear is 36cm, what is the distance from the left ear to T3
|
3.6cm,the distance from the left ear is 10% of the total distance from ear to ear,10% of 36 is 3.6cm
|
|
|
the distance from T6 to Pz is 8cm, what is it from P4 to Pz
|
4cm,P4 is halfway between T6 and Pz, hlaf of 8 is 4cm
|
|
|
what electrode site is located half the distance from O2 to C4
|
P4,which is halfway between O2 and C4
|
|
|
the distance from F7 to F3 is 6cm, what is the distance from F3 to Fz
|
6cm, F7 and Fz are equidistant to F3
|
|
|
what electrode site is 10% of the inion
|
Oz,placed 10% of hte vertical measurement of the head above the inion
|
|
|
a stress loop is often helpful when applying which electrodes
|
leg EMG,reduces them getting pulled off
|
|
|
what is the best sensitivity setting for EEGs in adults
|
7uV/mm
|
