Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
Normal Size Small Size show me how
Somatosensory EPs 2
Somatosensory evoked potentials 2
| Question | Answer |
|---|---|
| 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
Popular Physiology sets