ACNS EEG
_____ channels of simultaneous recording are considered the minimum number
required to show the areas producing most normal and abnormal EEG patterns. -
answer SIXTEEN
Experimental evidence suggests that ____________ or __________________
electrodes held on by collodion are the best, but other electrode materials and electrode
pastes have been used effectively, especially with contemporary amplifiers having high-
input impedances - answer silver—silver chloride or gold disk
Recording electrodes should not significantly attenuate signals between ____ and
______ Hz - answer0.5 and 70 Hz
Needle electrodes are ____ recommended for routine clinical use. Beyond
considerations of patient discomfort and risk of injuries to personnel, these electrodes
have higher impedances than appropriately applied cup electrodes, resulting in
potentially higher levels of noise. - answerNOT
Subdermal needle electrodes (SNE) or wire electrodes (SWE) may be used for
___________________ recording of EEG in stuporous or comatose patients in
situations where application of cup electrodes is ______ feasible because of personnel
or time constraints. - answerprolonged
not
he 10 to 20 System is the only one officially recommended by the _________.It is the
most commonly used system and should be used universally. - answerIFCN
In every case, an isolated __________ electrode should be placed and connected to
the jackbox as specified by the manufacturer. - answerground
The isolated ground does not allow __________________ currents to pass and is not a
safety hazard as were earth grounds used in early analog EEG devices. -
answerdangerous
Interelectrode impedances should be checked as a routine prerecording procedure.
With modern digital EEG recording equipment, impedances up to ___ k Ohms are
acceptable, but optimal recording still requires impedances that are balanced. -
answer10
Unbalanced impedances compromise the ability of an EEG amplifier to ________
potentials that are the same at a pair of electrodes while ________________ those that
are different (common mode rejection) - answerreject
, amplifying
Impedances should also not be below _____ Ohms because this usually indicates a
____________ or short circuit, possibly related to a salt bridge on the scalp. -
answer100
shunt
Electrode impedances should be rechecked during the recording when any pattern that
might be ________________ appears - answerartifactual
It is desirable that at least some montages in all laboratories be ______________ to
facilitate communication and comparison - answeruniform
The information associated with the record should include, as a minimum: - answerthe
name and age of the patient,
the date of the recording,
an identification number,
and the name or initials of the technologist.
Appropriate calibrations should be made at the beginning of every EEG recording. This
includes at least ___ seconds (or the duration needed to reach a stable recording) of a
square wave calibration. - answer10
In addition to the standard square-wave calibration, the biologic calibration may
occasionally help in detecting _________ in the montage selection process or in the
pen-writing mechanism for analog recordings. For this purpose, an
____________________ (frontooccipital) derivation should be used because it can
include fast and alpha range patterns as well as eye movement activity in the delta
range. - answererrors
anteroposterior
The calibration is an integral part of every EEG recording. It gives a ________________
factor for the interpreter and tests the EEG machine for sensitivity, high-frequency and
low-frequency response, noise level, and pen alignment and damping (for analog
systems). Calibration voltages must be appropriate for the sensitivities used during the
recording. After calibration, visual review of a 30-second run on the system reference
montage _____________ the notch filter is also recommended. - answerscaling
The sensitivity of the EEG equipment for routine recording should be set in the range of
_____ to _______ μV/mm of trace deflection. - answer5 to 10
Sensitivity is defined as the ratio of input ___________ to trace ___________. It is
expressed in microvolts per millimeter. - answervoltage
deflection
_____ channels of simultaneous recording are considered the minimum number
required to show the areas producing most normal and abnormal EEG patterns. -
answer SIXTEEN
Experimental evidence suggests that ____________ or __________________
electrodes held on by collodion are the best, but other electrode materials and electrode
pastes have been used effectively, especially with contemporary amplifiers having high-
input impedances - answer silver—silver chloride or gold disk
Recording electrodes should not significantly attenuate signals between ____ and
______ Hz - answer0.5 and 70 Hz
Needle electrodes are ____ recommended for routine clinical use. Beyond
considerations of patient discomfort and risk of injuries to personnel, these electrodes
have higher impedances than appropriately applied cup electrodes, resulting in
potentially higher levels of noise. - answerNOT
Subdermal needle electrodes (SNE) or wire electrodes (SWE) may be used for
___________________ recording of EEG in stuporous or comatose patients in
situations where application of cup electrodes is ______ feasible because of personnel
or time constraints. - answerprolonged
not
he 10 to 20 System is the only one officially recommended by the _________.It is the
most commonly used system and should be used universally. - answerIFCN
In every case, an isolated __________ electrode should be placed and connected to
the jackbox as specified by the manufacturer. - answerground
The isolated ground does not allow __________________ currents to pass and is not a
safety hazard as were earth grounds used in early analog EEG devices. -
answerdangerous
Interelectrode impedances should be checked as a routine prerecording procedure.
With modern digital EEG recording equipment, impedances up to ___ k Ohms are
acceptable, but optimal recording still requires impedances that are balanced. -
answer10
Unbalanced impedances compromise the ability of an EEG amplifier to ________
potentials that are the same at a pair of electrodes while ________________ those that
are different (common mode rejection) - answerreject
, amplifying
Impedances should also not be below _____ Ohms because this usually indicates a
____________ or short circuit, possibly related to a salt bridge on the scalp. -
answer100
shunt
Electrode impedances should be rechecked during the recording when any pattern that
might be ________________ appears - answerartifactual
It is desirable that at least some montages in all laboratories be ______________ to
facilitate communication and comparison - answeruniform
The information associated with the record should include, as a minimum: - answerthe
name and age of the patient,
the date of the recording,
an identification number,
and the name or initials of the technologist.
Appropriate calibrations should be made at the beginning of every EEG recording. This
includes at least ___ seconds (or the duration needed to reach a stable recording) of a
square wave calibration. - answer10
In addition to the standard square-wave calibration, the biologic calibration may
occasionally help in detecting _________ in the montage selection process or in the
pen-writing mechanism for analog recordings. For this purpose, an
____________________ (frontooccipital) derivation should be used because it can
include fast and alpha range patterns as well as eye movement activity in the delta
range. - answererrors
anteroposterior
The calibration is an integral part of every EEG recording. It gives a ________________
factor for the interpreter and tests the EEG machine for sensitivity, high-frequency and
low-frequency response, noise level, and pen alignment and damping (for analog
systems). Calibration voltages must be appropriate for the sensitivities used during the
recording. After calibration, visual review of a 30-second run on the system reference
montage _____________ the notch filter is also recommended. - answerscaling
The sensitivity of the EEG equipment for routine recording should be set in the range of
_____ to _______ μV/mm of trace deflection. - answer5 to 10
Sensitivity is defined as the ratio of input ___________ to trace ___________. It is
expressed in microvolts per millimeter. - answervoltage
deflection
