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SEP 3

Somatosensory evoked potentials 3

QuestionAnswer
The best nerve for generating leg SEPs posterior tibial
The site of stimulation for the posterior tibial nerve ankle
If the common peroneal nerve is stimulated for a leg SEP, it is stimulated at this site knee
When stimulating the posterior tibial nerve for a leg SEP, you stimulate until you can see a small amount of __ in the foot plantar flexion
When stimulating the peroneal nerve for a leg SEP, you stimulate until you can see a small amount of __ in the foot eversion
The cathode for posterior tibial nerve stimulation is placed midway between the __ border of the __ __ and the __ border of the __ __ medial, Achilles tendon, posterior, medial malleolus
The negative stimulating electrode for lleg SEPs is the __ cathode
The positive stimulating electrode for SEPs is the __ anode
Thet anode for leg SEPs of the posterior tibial nerve is placed __ cm distal to the cathode 3
The ground electrode for SEPs recorded from the posterior tibial nerve are attached to the skin of the __ at a site __ (proximal/distal) to the stimulating electrode calf, proximal
The peroneal nerve is exposed in the __ fossa and over the __ neck popliteal, fibular
For leg SEPs recorded from the peritoneal nerve, the cathode is placed over the __ (medial/lateral) part of the ____, just medial to the tendon of the ____ and just __ (above/below) the leg crease lateral, biceps femoris, below
For leg SEPs recorded from the peritoneal nerve, the anode is placed __ cm __ (proximal / distal)_ from the cathode 3, distal
For leg SEPs recorded from the peritoneal neve, the ground electrode is placed on the leg __ (proximal /distal) to the stimulating electrodes proximal
The leg SEPs consists of __ conducted action potentials (orthodromically / antidromically / mixed) mixed
The sural nerve can be stimulated near the __ __ lateral malleolus
The superficial peroneal nerve is one __ above the lateral malleolus; it is a __ (sensory / motor / mixed) nerve handsbreadth, sensory
THe saphenous nerve is a sensory breanch of the __ nerve femoral
The __ nerve is above and anterior to the medial malleolus; it is sensory saphenous
The saphenous nerve is (above, below) __ and (anterior, posterior) __ to the medial malleolus above, anterior
The saphenous nerve is above and anterior to the __ __ medial malleolus
Between __ and __ trials are needed for most leg SEPs 1000, 4000
Analysis time for most leg SEPs is __ msec 60
Bandpass for most leg SEPs is __ - ___ Hz 30, 3000
The three measurements used for leg SEPs LP latency, P37 latency, LP-P37 interpeak interval
Channel 1 in most leg SEPs CPi-Fpz
Channel 2 in most leg SEPs CPz-FPz
Channel 3 in most leg SEPs FPz-C5s
Channel 4 in most leg SEPs T12S-Ref
If segmental nerve stimulation is needed, L2 and L3 can be tested by stimulation of the ____ nerve at the thigh lateral femoral cutaneous
If segmental nerve stimulation is needed, L3 can be tested by stimulation of the ____ nerve at the medial knee saphenous
If segmental nerve stimulation is needed, L4 can be tested by stimulation of the ____ nerve below the medial malleolus saphenous
If segmental nerve stimulation is needed, L5 an be tested by stimulation of the ____ nerve on the lateral aspect of the leg superficial peroneal
If segmental nerve stimulation is needed, S1 be tested by stimulation of the ____ nerve above the lateral malleolus sural
If segmental nerve stimulation is needed, L2 and L3 can be tested by stimulation of the lateral femoral cutaneous nerve at the __ thigh
If segmental nerve stimulation is needed, L3 can be tested by stimulation of the saphenous nerve at the ___ medial knee
If segmental nerve stimulation is needed, L4 can be tested by stimulation of the saphenous nerve here below the medial malleolus
If segmental nerve stimulation is needed, S1 be tested by stimulation of the sural nerve above the lateral malleolus above the lateral malleolus
If segmental nerve stimulation is needed, L5 an be tested by stimulation of the superficial peroneal nerve here lateral leg
In additition to the typical recording electrodes, for leg SEPs, a PF electrode is placed in the popliteal fossa between the tendons of the __ and __ semimembranosus, semitendinosus
If good cerebral potentials are not seen, recording times are increased from 60 msec to __ msec 100
The electrode between the semimembranosus and semitendinosus muscles is known as the __ electrode PF
The PF electrode consists of a major __ (positive / negative) peak and a smaller __ (positive / negative) peak negative, positive
The approximate latency of the PF potential is __ - __ msec 9, 10
The lumbar potential latency is usually __ - __ msec 17, 21
The LP potential consists of a major __ (positive / negative) peak followed by a smaller __ (positive/negative) peak negative, positive
Tibial nerve stimulation produces a positive scalp potential designated __ P37
Peroneal SEP produces a wave similar to that of the tibial nerve SEP, but it is known as the __ P27
spinal cord conduction in adults slows after age __ 60
Adult velocities for peripheral nerve conduction is reached at age __ - __ years 4, 5
At birth, peripheral and spinal nerve conduction velocities are __% of their adult values 50
LP latency for posterior tibial nerve 22.1
P37 latency for the posterior tibial nerve 41.7
Average LP-P37 interval latency for posterior tibial nerve 20.5
Average LP latency for the peroneal nerve 13.5
Average P27 latency for the peroneal nerve 31.8
Average N33 latency for the peroneal nerve 40.7
Average LP-P27 interval for the peroneal nerve 19.38
Created by: schmittse
 

 



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