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Somatosensory EPs 2

Somatosensory evoked potentials 2

QuestionAnswer
Electrode placement lateral to the clavicle leads to a __ (higher / lower) amplitude of the N9 with only slightly different latency higher
In somatosensory evoked potentials, positive voltages are associated with an __ (upward/downward) deflection downward
__ is an UE small wave thought to be generated by the dorsal root entry zone surrounding the gray matter of the dorsal horn and dorsal columns; it is not routinely used in clinical practice N11
__ has origins in the dorsal column and nucleus cuneatus N13
The __ arm SEP wave probably represents the lemniscal paths ascending from the spinal cord into higher cervical regions P14
P14 is a __ (near/far) field potential far
__ is the arm SEP thought to be associated with either the cerebral cortex or thalamocortical radiations N20
__ is the first later peak generated after N20 in upper extemity recordings; it is likely generated by cortical relays P30
Scalp SEPs of after __ weeks show a large __ (positive / negative) wave of over 200 msec latency 24, negative
In premature infants, a scalp SEP shows a large negative wave with a latency > __ msec 200
As premature infants mature, the amplitude of the 200 msec wave __ (increases / decreases) decreases
The neonatal SEP __ (does / does not) vary with sleep state does
Adult SEP waveforms and latencies are reached between __ and __ years of age 3, 10
Central conduction velocity in children is about __ m/s at birth and reaches adult conduction velocities (50 m/s) at age __ 10, 8
Peripheral conduction velocity is __ - __ m/s at birth and reaches adult values of __ - __ m/sec at age __ - __ months 20, 25, 60, 80, 12, 18
Amplitude of the cervical SEP decreases over age __ 40
The temperature of a stimulated limb must be maintained at __ - __ degrees C 20, 22
Using electrodes on the digits leads to __ (faster/slower) response times slower
If ring electrodes are used to stimulate the median nerve, they are used on digit __ or __ 2, 3
If ring electrodes are used to stimulate the ulnar nerve, they are used on digit __ or __ 5
If pure sensory stimulation of the radial nerve is desired, it is stimulated here Radial aspect of the dorsal wrist
If pure sensory stimulation of the musculocutaneous nerve is desired, the __ branch is stimulated approximately __ cm below the __ (lateral, medial) aspect of the cubital crease 2, lateral
Stimulus duration for an arm SEP is between __ - __ msec 200, 300
The four main criteria for abnormality of an arm SEP absence of a wave, decreased conduction velocity, increased absolute latency, increased interpeak latency
The four waves used for interpretation of arm SEPs EP, N13, P14, N20
Isolated absence of any of either of these two "big four" arm SEP waves can be normal EP, P14
Normal N9 / EP latency for the median nerve 11.8
Normal P14 SEP latency for the median nerve 16.1
Normal N20 SEP latency for the median nerve 21.5
Normal N13-N20 interval for SEPs 7.1
The difference between the cervical potential and the scalp potential is known as this central conduction time
Maximal interside difference allowable for N9/Ep in msec 0.87
Maximal interside difference allowable for P14 in msec 0.7
Maximal interside difference allowable for N20 in msec 1.2
Maximal interside difference allowable for N13-N20 difference in msec 1.2
Created by: schmittse
 

 



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