Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Somatosensory EPs 1

Somatosensory Evoked Potentials Part I

QuestionAnswer
For mixed nerves, SEP stimulus intensity is set to generate a) 2 mAmps below a twitch, b) no twitch, c) slight twitch, d) 25 mAmps slight twitch
For patients with aneuropathy (who may not twitch), intensity of SEP stimulation for a mixed nerve is usually set between __ and __ mA 5, 15
For purely sensory nerves, stimulus intensity is usually __ - __ times the sensory threshold 2.5, 3
Which of the following is the best wat to set stimulus intensity: (a) current, (b) voltage, (c) threshold, (d) impedence threshold
The typical duration of electrical pulses for SEPs in milliseconds 0.2
The typical stimulus rate for SEPs is frm __ - __ per second (higher rates are more painful) 4, 7
Steady state SEPs can be obtained at stimulation rates of __ - __ Hz, but these are painful so they are not used 12, 200
SEP stimulation rates should never be multiples of __ 60
Most SEPs are __ (unilateral / bilateral ) unilateral
Impedence of ground electrodes should be less than ___ kiloOhms 10
Impedence of ground electrodes should be less than __ Ohms 10000
The ground electrode is electrically connected to the __ and __ __ to elminated the potential of a voltage gradient between these pieces if equipment stimulator, recording amplifier
The low frequency filter for SEPs is usually set from __ - __ Hz 5, 30
The high frequency filter for SEPs is usually set from __ - __ Hz 2500, 4000
Reduction of the HFF leads to a __ (increase / decrease) in the latency of the response increase
Surface stimulation of the peripheral nerves in the upper extremities is provided by discs over the __ or __nerves median, ulnar
The peripheral electrodes in UE are separated by __ - __ cm for SEPs for disc electrodes 2, 3
When needle electrodes are used for SEPs, the two electrodes are separated by __ cm in the middle of a dermatome 1
For SEPs, the proximal electrode is connected to the __ (positive / negative) pole of the stimulator output and becomes the cathode negative
For SEPs, the distal electrode is connected to the __ (positive / negative) pole of the stimulator output and becomes the anode positive
Number of trials for median nerve SEPs is between __ and __ 500, 2000
The analysis time for SEPs of the median nerve is __ msec 40
The bandpass for median nerve SEPs is __ - __ Hz 30, 3000
For median nerve SEPs, the __ (cathode / anode) is placed 2 cm proximal to the wrist crease) cathode
For median nerve SSEPs, the __ (cathode / anode) is placed 2 cm distal to the wrist crease electrode anode
For median nerve SEPs, the stimulus rate is __ - __ Hz 4, 7
For median nerve SEPs, the stimulus duration is __ - ___ microseconds 200, 300
For median nerve SEPs, the stimulus intensity should be set above the level at which __ __ twitch is seen thumb abduction
The nomenclature for Erb's point ipsilateral to a stimulus Epi
The nomenclature for C5 over the spinous process C5S
The nomenclature for contralateral scalp between C3/4 and P3/4 CPc
The nomenclature for ipsilateral scalp between C3/4 and P3/4 CPi
Channel 1 in an upper extremity SEP CPc-CPi
Channel 2 in an upper extremity SEP CPi-Ref
Channel 3 in an upper extremity SEP C5s-Ref
Channel 4 in an upper extremity SEP Epi-Ref
The total number of channels used in an SEP montage 4
The most common site of the cervical recorded in an UE SEP is at the level of __; lesss frequently, recordings are made at __ or __ C5, C2, C7
THe waves seen at C5 are generated by the ____ neurons dorsal horn
The peak latency of the __ (negative / positive) peak is measured for Erb's point potential negative
Erb's point is __ - __ cm above the clavicle, lateral to the attachment of ___ 2, 3, sternocleidomastoid
The Erb's point potential is made of axon potentials conducted __ (orthodromically / antidromically / both / neither) both
The 5 major potentials in arm SEPs EP, N13, P14, N18, N20
On other derivations, Erb's point potential is identified as __ N9
EP (aka N9) is best seen in channels including the __ electrode Epi
The N13 peak is best seen in channels including the __ electrode CS5
The channel that compares ___ and reference best shows P14 and N18 CPi
The channel comparing __ and __ best shows N20 CPi, CPc
Created by: schmittse