Exan 5 Flashcards
(35 cards)
High pass filters is also know as ?
Low frequency filter LFF
Increase this will allow faster waves to enter the channel, while decreasing will filter out fast waves?
High frequency filters HFF
Increase 15 (35) to 35 (100) will allow faster waves to enter the channel
While decreasing will filter out fast waves 35 (100) to 15 (35)
Decrease this will allow slower waves to enter the channel, while increasing will filter out these slow waves?
LFF low frequency filter
As LFF decreases what happens to time constant?
Increase
The number of micro volts per millimeter that the channel will display the waves is known as?
Sensitivity
What happened to the wave if decrease the sensitivity?
Wave appear taller
Ex-EKG 100 to 35
Adjusting the sensitivity will adjust the actual amplitude of the wave (true or false).
False
The sensitivity of EMG is ?
A. 20 uv/ mm
B. 2uv/mm
C. 7 uv/mm
D. 35 uv/mm
2uv
The sensitivity of EKG is?
A. 2 uv/ mm
B. 7 uv/ mm
C. 35 uv/ mm
D. 20 uv/ mm
D. 20 uv/ mm
Montages are a collection of what ?
Derivations
What is the purpose of signal calibration?
A. Proper functioning if all amplifier is demonstrated
True or false in a mechanical baseline the power is turned On
False. ( it’s turned OFF)
True or false in a electrical baseline the power is turned ON
True
Low pass filter is also know as?
Hff high frequency filters
The initial recording equipment calibration for Polysomnography should show
A. 50uv/. Signal introduction to all channels regardless of filters settings
B. The individual channel settings set for the physiologic parameter to be monitored
C. The same EEG activity in all channels
D. The filters ( high, low and 60 HZ) and sensitivity for each channel to be the same
The filters (high, low and 60 HZ ) the sensitivity for each channel to be the same
During Psg , you might expect sedative medications to:
EEG activity to show increased Alpha and background fast activity
An alternating EEG pattern seen in full term sleeping ( NREM) infants consisting of both high and low voltage activity us termed
A. Trace discontinu
B. Delta sleep
C. Trace alternant
D. Sawtooth waves
C. Trace alternant
Short time constants should be used when recording which if the following physiologic variables.
A. EEG
B. EOG
C. EMG
D. Respirations
C. EMG
Out of phase signal in the loc A2 and roc A1 derivations. Indicate
A. .cerebral activity
B. Artifact
C. Eye movement
D. Wakefulness
C. Eye move moment
With the right outer canthus eye lead (ROC) positioned 1cm lateral to and 1cm above the outer canthus, eye opening will result in the (ROC) becoming
A. Negatively charged
B. Positively charged
C. Bipolar
D. Referential
A. Negatively charged
Sleep transients recorded with a C 3 - A1 derivation rather than C3 A2 derivation will result in
a. Lower amplitude sleep spindle
B. Higher amplitude k complex
C. Faster frequency alpha
D. Slower frequency delta
Lower amplitude sleep spindles
LFF referred to as high pass filter
They allow?
It filters ?
They allow high frequencies to pass through
Filters low frequencies out
HFF referred to as low pass
They allow ?
It filters?
They allow low frequencies to pass through
Filters high frequencies out
Typical filters are set slightly beyond the bandwidth range
To record EEG within?
The LFF is set to ?
The HFF is set to ?
This ensures full?
While ?
To record EEG within 0.5 – 25 HZ
LFF is set to 0.3 HZ
HFF is set to 30 or 35HZ
This ensues full signal resolution
While attenuating under durable frequencies outside the selected range
