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