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SEP 3
Somatosensory evoked potentials 3
| Question | Answer |
|---|---|
| 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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