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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
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