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226 Cards in this Set

  • Front
  • Back
Polysomnography is indicated for the ____ & _____
routine diagnosis of multiple sleep disorders, and positive airway pressure titration, and even parasomnias or nocturnal seizure disorders
Sleep disorders that a polysomnogram can indicate:
sleep related breathing disorders, narcolepsy, and periodic limb movement disorder.
Polysomnography is a
multi-channel recording attended by a qualified sleep technologist
What are the steps for performing polysomnography:
Preparing to record the PSG
Testing the equipment
Monitoring patient & recording
Recognizing emergency situations
When preparing to record the PSG, you
Verify orders
Enter Patient data
Select montage
When verifying orders make sure that the physician's orders are
complete and correct
Verify orders by interviewing the patient in order to
Assess patient's understanding of the procedure; and to clarify information that may contradict the orders
Any changes to the orders must be discussed with physician and
documented.
When verifying orders, make sure the correct ___, ___, and ____ have been applied or prepared for the study
electrodes, sensors, and ancillary equipment
Entering the patients data includes:
name, DOB, other info required by your facility or acquisition system: referring physician, height, weight, neck circumf., unique identifier, meds, med. history
Choose the correct montage for
the study ordered
There is often a standard montage prepared for these commonly performed tests:
PSG, MSLT, CPAP titration, etc.
Montages can be _____ for special orders
customized for seizure montage or research protocols
Test the Equipment by:
1 Start the recording
2 Perform impedance check
3 Adjust settings
4 Calibrations
5 Artifact corrections
When testing the equipment, calibration includes:
Amplifier (electrical)calibration
Ancillary equip calibration
Biocalibration
Each acquisition system will have a different procedure for starting a recording, it is often as simple as
clicking a toggle icon; or viewing manufacturer's instructions
Note that on many digital systems, there is a ____ mode
non-recording
Data acquired by a non-recording mode cannot be
recovered
There is often a safety check to ensure that a ____ recording is not accidentally stopped.
live
Make sure that the study is being recorded before
beginning impedance checks and calibrations
___ and ___ should be part of the record to verify the integrity of the recording.
Impedance checks and calibrations
Impedance is a measure of
resistance to the flow of alternating current
Impedance is measured in
Ohms
To produce the best waveforms, the impedance of the exploring and reference electrodes should be
low and similar (matched) to each other
Low impedance improves the flow of current, called
conductance
Low impedance maximizes ____ waveform
amplitude
Matching impedance of electrode pairs prevents
the introduction of electrical interference
Matching impedance of electrode pairs maximizes the effectiveness of the
common mode rejection function of the amplifier
Before performing calibrations, the tech checks the impedance of
all possible electrode sites
Impedances should be at or below the recommended level for the sleep facility, usually
5-10 kilohms
High impedance must be corrected before
the recording starts
Channels with high impedance in one or both electrodes in a pair can exhibit a variety of
artifacts: 60 Hz interference, electrode popping, respiratory or movement artifact, ECG intrusion, and signal dropout
High impedance in a reference electrode will affect all
exploring electrodes paired with it
High impedance in the ground can affect all
channels
The tech should us a _____ approach to find the source of high impedance
systematic
Common sources of high impedance include:
inadequate skin prep; insufficient electrolyte; loose connection to patient; loose connection to headbox or amplifier; external electrical interference; broken electrode or wire
Corrective action of inadequate skin prep:
re-prep and re-abrade skin
Corrective action of insufficient electrolyte (conductive paste or gel):
refill electrode cup
Corrective action of loose connection to patient:
reapply electrode
Corrective action of loose connection to headbox or amplifier:
reconnect all wires and cables
Corrective action of external electrical interference:
identify and remove
Corrective action of broken electrode or wire:
replace electrode or wire
Once the impedances have been tested and corrected, check the ___ and ___ of the signal in each channel
appearance and range
___ and ____ are set when the montage is selected, but may need to be adjusted on some channels
Filters and sensitivities
The ______ should not be on at the start of a study.
60 Hz notch filter
When should a 60 Hz notch filter be used?
to attempt to improve a signal without haveing to wake the patient
EMG sensitivities or gains may need to be adjusted, but should not be changed after
patient calibrations
Adjust sensitivities or gains on the ECG signal so that all components of the waveform can be
identified
Make sure the polarity of signals is
correct
Adjust sensitivities or gains on respiratory channels to
maximize the waveform without signal blocking.
Calibration is a procedure for making sure that each channel responds appropriately to
a standard input
Calibration allows you to check the performance of the equipment and set the _________ on quantitative channels
the measurement scale
Three types of calibration:
Amplifier calibration
Ancillary equipment cal
Biocalibration
Amplifier calibration is also known as
machine or electrical calibration
In amplifier calibration, a ____ is sent through each channel of the amplifier
set voltage (for ex: 50 uV)
The waveform that results from amplifier calibration should look ______ in channels with the same _______________
identical in channels with the same filter and sensitivity settings
In amplifiers calibration, ________ are external to the amplifier, and do not receive the ______.
DC inputs
voltage input
An amplifier channel that does not process the standard signal correctly needs to be
replaced
Some amplifiers are _____, but most often, when it doesn't process the standard signal correctly,the whole amplifier will need to be replaced to correct a bad channel
modular
Ancillary equipment that is recorded on a _________ needs to be calibrated to ensure accurate measurements
DC channel
Ex. of ancillary equipment that is recorded on a DC Channel:
Oximeter
Capnograph
PAP devise
See manufacturer's instructions on how and when to _____ ancillary equipment
calibrate
___________may or may not need to be performed before every PSG
Ancillary equipment calibrations
Biocalibration (or patient calibration) is the process of
testing to ensure that each sensor can accurately detect physiological changes
Biocalibrations are done by
having the patient respond to standard instructions, and examining the ouptut
When there is an inadequate response to biocalibrations, the tech
does a systematic check to determine the source of the problem
After a problem is corrected in biocalibration, the maneuver is
repeated
In biocalibration, the tech must lable each maneuver
in sync with the patient's response
In biocalibration, the patient should be lying in the ____ position, with ____ connected, the ____ on, and ____ closed
supine
headbox
light
door
During biocalibration, make sure the patient can hear and understand you by testing
the intercom system
Each lab will have a standard set of _____ and _____ for checking the signal quality of each channel in a montage.
maneuvers and labels
In biocalibration, the set of maneuvers and labels will change for
different types of tests.
Bio-close your eyes and relax
EC, wait 30 sec
Bio-Open your eyes
EO, wait 30 sec
Bio-Keeping your head still and moving only your eyes, look left, right and then back to center.
[L] [R]
Bio now look up, and down
[U] [D]
Bio-close your eyes, then blink 5 times
[B5]
Bio-Grit your teeth
[GT]
Bio-smile
[SM]
Bio-with the right leg only, point and flex your toes up, then down,. Repeat for the left leg.
[RF] [LF]
Bio-hum
[HM]
Bio-take three breaths through your mouth only
[MTH]
Bio-take three breaths through your nose only
[NSE]
Bio-take a deep breath and hold it, wait 10 sec and breathe normally
[HB]
During biocalibration, visually verify the accuracy of the
position sensor
During biocalibration, verify the integrity of the
oximetry signal
A sample of the EEG with eyes open and eyes closed will show
different waveforms and assist with state recognition
Most patients will show ______ with their eyes open
fast, law voltage mixed frequency
When checking the EEG channels, the tech should look for a change to ____ when the eyes are closed.
alpha frequency (8-13 Hz or cycles per second)
Checking the EEG, not all patients have _______, and the precise cycles per second (CPS)
will vary from patient to patient
alpha
When checking the EEG, it is important to get a large sample of
eyes open, and eyes closed
When checking the EEG, the tech should look for ___ and ____ in the EEG during calibration
artifacts and patient generated variations
The patient may have muscle artifact intruding into the EEG from
increased muscle tension in the scalp.
Muscle tension in the scap should subside as the patient ___, but can sometimes persist after ___________.
falls asleep
sleep onset
Shivering can also cause a ______.
fast frequency artifact
When shivering causes a fast frequency artifact, the tech should
adjust the temp or offer extra blankets
Older patients may show _____ EEG, or ________
lower voltage EEG, or slower frequency waves
Patients with degenerative brain disease, and patients on some medications, may show
slower frequency, higher amplitude waves
When checking the EOG channels, the tech must verify that the eye electrode channels (E1 and E2) show
adequate response when the patient moves their eyes.
In EOG< adequate eye movements are needed to
assist in stage recognition
What are the recommended EOG derivations?
E1-M2 (E1 placed 1 cm below left outer canthus)
E2-M2 (E2 placed 1 cm above the right outer canthus)
In EOG derivations, vertical eye movements will show
out-of-phase deflections
In EOG derivations, horizontal eye movements will show
in-phase deflections
Alternate EOG derivations are:
E1-FP2 (E1 1 cm below and 1 cm lateral to the left outer canthus)
E2-FP2 (E2 1 cm below and 1 cm lateral to the right outer canthus)
During the alternate EOG derivation (where both E1 & E2 down) vertical eye movements will show
in-phase deflections
During the alternate EOG derivation (where both E1 & E2 down) horizontal eye movements will show
out-of phase deflections
Patients with a glass eye do not demonstrate EOG signals because the don't have
movement, or the tissue to create the electrical gradient that allows the detection of movement
When checkin the EOG, the tech should document any unusual
findings.
____ electrodes should be placed to record chin EMG.
3
Describe where to place the three chin EMG electrodes:
1 cm above the inferior edge of the mandible
2 cm below and 2 cm right of midline
2 cm below and 3 cm left of midline
What does the standard chin EMG derivation consist of
either of the electrodes below the mandible referred to the electrode above the mandible. The other electrode is a backup to allow continued display of EMG activity if 1 of the primary electrodes malfunctions.
The chin EMG is needed to assist in _____recognition.
sleep stage recognition
The tech must verify that the chin channel shows ___ when the patient moves the mouth or jaw.
increased amplitude
The gain and sensitivity may need to be adjusted, in the chin EMG, if the amplitude is
too low during wakefulness
Changes in the gain or sensitivity (of chin EMG) should not be made ____
after the initial channel calibration
An artifact-free ECG signal is necessary for ____ & ______.
accurate diagnosis and patient safety
When checking the ECG channel, make sure that all components of the _____ signal can be identified.
cardiac
When checking the ECG channel, make sure the signal has the correct
polarity
When checking the ECG channel, check that the waveform has the correct polarity for the
selected lead placement.
What is the recommended ECG Lead?
A single modified ECG Lead II using the torso electrode placement is recommended.
When checking the leg EMG channels, the tech must verify that each leg channel shows
increased amplitude when the patient flexes his foot or tow
When checking leg EMG channels, the gain or sensitivity may need to be adjusted if
the amplitude is too low during the maneuver
The amplitude of the channel must be large enough to discriminate a leg movement from ____
baseline (rest).
The gain or sensitivity of leg EMG channels should not be changed
after the initial channel calibration
When checking leg EMG channels, make sure that the movement occurs in the
correct channel (left or right)
When checking leg EMG channels, if the deflection is in the wrong channel, the electrodes can simply be
switched at the headbox
When checking the snore sensor channel, the tech must verify that there is
an adequate response to the instruction to make noise (hum, cough, snore, etc.)
When checking the snore sensor channel, There should be a ____ from baseline when there is a hum, cough, snore, etc.
large increase
When checking the snore sensor channel, the gain may need to be adjusted to
visualize soft snores or noises in this channel
When checking the snore sensor channel, a constant high amplitude signal may indicate
a broken sensor or external pressure on the sensor
When checking airflow channels, the tech must verify that there is an
adequate response in airflow channels to respiratory maneuvers
An oronasal thermal sensor channel detects
both nasal and mouth-only breathing
A nasal pressure channel (NAF) can detect
only nasal breathing
When checking airflow channels, gains or sensitivities may need to be adjusted to
visualize inspiration and expiration
When checking airflow channels, make sure that the signal is not
blocking so that subtle airway obstruction can be detected
When checking respiratory effort channels, the tech must verify that there is an
adequate response in effort channels to respiratory maneuvers, especially to "hold your breath".
When checking respiratory effort channels, gains or sensitivities may need to be adjusted, or ____, to fully visualize ______
or the effort sensors themselves may need to be loosened, tightened, or moved, to fully visualize inspiration and expiration
When checking respiratory effort channels, patients with neuromuscular or respiratory disease may demonstrate
reduced effort signal outputs
When checking the oximetry channel, the technologist must verify
that the SaO2 sensor is working and displaying correctly on the recording
When checking the oximetry channel, lower than normal saturation should be verified with a
backup or portable oximeter
When checking the oximetry channel, Consistent readings of 100% indicate
a malfunctioning sensor or oximeter, or that the oximeter needs to be recalibrated
When checking the oximetry channel, intermittent data can indicate
a loose or broken sensor
When checking the body position channels and position sensors are used, the tech must _____ verify that the patient is
Visually verify that the patient is in the position indicated on the recording
When checking the body position channels, documentation of all position changes will be _______ if sensors are not used, or are ______
manually enetered;
incorrect
When monitoring the patient and the recording, the technologist is responsible for these 6 things:
1 Maintaining an artifact-free recording
2 Observing the patient
3 Assisting patient as needed
4 Monitoring channels for significant changes
5 Documenting all interventions and notable events
6 Recognizing emergency situations and intervening
When monitoring the patient, documentation is
required information; and for schedules
When monitoring the patient for artifact, look for
patient emergencies and arrhythmias
When monitoring the patient for stage changes, look for
sleep onset and REM onset
When monitoring the patient for seizures, look for
desaturations and abnormal behaviors
Artifact is the
intrusion of undesired or non-biological signals into the PSG
The tech must be able to discriminate artifact from
genuine physiological signals
All channels must be routinely checked for the presence of
artifact
Be aware of patient's sense of privacy and security by
knocking before entering and informing the patient of what you are doing
In some cases it's best not to disturb the patient:
to limit variables in research study, to limit intrusion on the patient's natural sleep pattern, and if there are built-in backups
In some cases it's best not to disturb the patient:
to limit variables in research study, to limit intrusion on the patient's natural sleep pattern, and if there are built-in backups
When an artifact is detected, the tech must
determine the source and then formulate a corrective action
When the tech corrects a detected artifact, it is called
troubleshooting
When the tech corrects a detected artifact, it is called
troubleshooting
The tech must develop a systematic approach to troubleshooting that allows ____ and _____ of al possible sources of artifact
identification and eliminating
The tech must develop a systematic approach to troubleshooting that allows ____ and _____ of al possible sources of artifact
identification and eliminating
With more ____, techs become more proficient at recognizing the cause of special artifacts
experience
With more ____, techs become more proficient at recognizing the cause of special artifacts
experience
When an artifact is detected, the tech must
determine the source and then formulate a corrective action
When an artifact is detected, the tech must
determine the source and then formulate a corrective action
The technologist monitors patient activity via
video and audio equipment, or direct observation
Video output is often recorded simultaneously with the
PSG
Be aware of patient's sense of privacy and security by
knocking before entering and informing the patient of what you are doing
Simultaneous recording allows the correlation of observed behaviors with
one or more physiological parameters
It is important to verify that the PSG recordings correlates with
the visual observations
The technologist monitors patient activity via
video and audio equipment, or direct observation
When the tech corrects a detected artifact, it is called
troubleshooting
Video output is often recorded simultaneously with the
PSG
Simultaneous recording allows the correlation of observed behaviors with
one or more physiological parameters
The tech must develop a systematic approach to troubleshooting that allows ____ and _____ of al possible sources of artifact
identification and eliminating
Simultaneous recording allows the correlation of observed behaviors with
one or more physiological parameters
With more ____, techs become more proficient at recognizing the cause of special artifacts
experience
It is important to verify that the PSG recordings correlates with
the visual observations
The technologist monitors patient activity via
video and audio equipment, or direct observation
Video output is often recorded simultaneously with the
PSG
It is important to verify that the PSG recordings correlates with
the visual observations
When observing the patient, the tech monitors the audio output from the
test room
When observing the patient, it is important to listen for the presence of quality of _______, and verify that they are
snoring or other sounds of airway obstruction, and verify that they are represented on the recording
Any external noise that affects the patient's sleeping environment should be
documented (ie sirens, thunder, etc)
The technologist must listen for communication from the patient like:
sleep talking or requests for help or assistance
During the night the tech looks for changes in
each channel
When checking the body position channels and position sensors are used, the tech must _____ verify that the patient is
Visually verify that the patient is in the position indicated on the recording
Notable changes in channels are
documented on the recording and on a log sheet
When checking the body position channels, documentation of all position changes will be _______ if sensors are not used, or are ______
manually enetered;
incorrect
During EEG, the tech documents
sleep stage changes;
arousals;
seizure activity;
alpha intrusion
During EOG, the tech documents
eye movements in NREM;
slow eye movements (SEMS)
Rapid eye movements (REMS)
When monitoring the patient and the recording, the technologist is responsible for these 6 things:
1 Maintaining an artifact-free recording
2 Observing the patient
3 Assisting patient as needed
4 Monitoring channels for significant changes
5 Documenting all interventions and notable events
6 Recognizing emergency situations and intervening
During chin EMG, the tech documents
bruxism;
atonia
When monitoring the patient, documentation is
required information; and for schedules
When monitoring the patient for artifact, look for
patient emergencies and arrhythmias
During ECG, the tech documents
arrhythmias
When monitoring the patient for stage changes, look for
sleep onset and REM onset
When monitoring the patient for seizures, look for
desaturations and abnormal behaviors
Artifact is the
intrusion of undesired or non-biological signals into the PSG
The tech must be able to discriminate artifact from
genuine physiological signals
All channels must be routinely checked for the presence of
artifact
Monitor LEG EMG for
periodic limb movements in sleep (PLMS); and other leg movements while awake or asleep
Monitor snore channel for changes in
sound level or quality
Monitor position because
position changes can worsen SRBD and cause artifact; and patient should be observed in supine position, particularly during REM sleep
Monitor respiratory channels for
sleep related breathing disorders (SRBD);
mouth breathing;
nasal obstruction
Monitor oximetry for
oxyhemoglobin desaturations
The tech is responsible for documenting all pertinent information that might assist in
the diagnosis and treatment of a sleep problem
Typically, the tech fills out a log at _______, as well as whenever ______.
regular intervals

notable events occur
Document that start and end of all periods you are in the patient's
room
Without proper documentation, a long period of patient-tech communication can look like
insomnia
The tech compiles the most relevant information in a
summary report
All reports must be ___ and ___ by the tech
signed and dated
The tech must be able to recognize patient emergencies that can be identified on the PSG including:
Dangerous arrhythmias;
Seizure activity;
Significant hypoxemia
Dangerous Arrhythmias would include:
Profound sinus bradycardia, or asystole of >3 sec
Second degree heart block
Third degree (complete) heart block
Ventricular fibrillation
Ventricular tachycardi
The tech must be able to recognize abnormal ____ and _____ in the EEG that can indicate seizure activity
waveforms and patterns
Abnormal waveforms and patterns in the EEG that can indicate seizure activity include:
Spikes;
Spike and wave;
Rhythmic bursts
Spikes, spike and wave and rhythmic bursts are abnormal waveforms that constitute emergency situations primarily when
paired with clinical evidence of seizure activity
Each facility will have a policy for intervention of seizure activity depending on the
length of the seizure activity and clinical symptoms
Use __ guidelines to assure patient safety while waiting for emergency personnel
BLS-Basic Life Support
The tech regularly monitors the recording for significant desaturations in SaO2 which indicates
hypoxemia
SaO2 Saturations below a level defined by the medical director will require intervention, which can include:
Calling on-call physician for orders;
Initiating standing orders for supplemental oxygen;
Notifying emergency personnel, and initiating BLS protocols
The important points to remember about detecting and managing patient emergencies are:
know and recognize potential emergencies;
Initiate emergency protocols;
protect the patient;
continue to monitor patient for problems;
Document observations and problems
After recognizing a potential emergency, make sure the patient is in a ____ & ___ position, for example
safe and comfortable;
dizzy patient should sit or lie down
After recognizing a potential emergency, observe the patient by checking for
skin pallor, sweating, gait problems, change in speech, confusion, and abnormal movements
After recognizing a potential emergency, ask patient about symptoms, including details about
severity, onset (new or recurring), and duration of chest pain, shortness of breath; dizziness; and confusion or disorientation
After recognizing a potential emergency, keep the monitoring equipment running until
the patient leaves the laboratory
Once an emergency is identified, the tech should follow the labs emergency protocol, which may include:
Initiating Basic Life Support;
Contacting the on-call physician or emergency team;
Transferring the patient to an emergency area or facility