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Electrophysiology
Never conduction studies
| Question | Answer |
|---|---|
| The cathode is negative or positive? | negative |
| Where is the cathode placed? | over the nerve |
| The anode is negative or positive? | positive |
| What does the cathode do to the nerve?(depolarize or hyperpolarize) | depolarize |
| What does the anode do to the nerve?(depolarize or hyperpolarize) | hyperpolarize |
| The sum total of all fibers recorded is known as the _____? | amplitude |
| The amplitude is measured in ______ for sensory and _____ for motor. | microvolts/milivolts |
| This measurement is taken from the baseline to the peak. | amplitude |
| The initial deflection of the negative phase to the return of the positive phase is called? | duration |
| Duration is measured in _______. | milliseconds |
| The time laps from the stimulation to the response is called the ______. | latency |
| Latency is measured in ______. | milliseconds |
| What is the normal shape of an evoked potential? | biphasic |
| Nerve conduction velocity(NCV)= ? | distance/(proximal latency-distal latency) |
| When conducting a NCS, the room temp should be above __ degrees C. | 25 |
| How does cold effect NCV? | it slows it down |
| How does heat effect NCV? | it speeds it up |
| By what age do most nerves mature? | age 5 |
| Below 5 years of age NCV is (slower/faster)? | slower |
| Where is NCV faster?(UE or LE) Why? | UE/nerves are shorter, diameters larger in UEs, temperature is higher in UEs |
| In motor nerve studies, prolonged latency = what? | slowed conduction |
| Prolonged palmar distal sensory latency is the 1st sign for what? | carpal tunnel |
| In motor nerve studies, prolonged latency of AP maybe the result of? | demyelination and/or axonal involvement |
| In motor nerve studies, decreased amplitude of AP maybe a result of? | axonal involvement |
| Slowed motor nerve conduction velocity maybe a result of? | demyelenation |
| What are the two main differences between orthodromic and antidromic? | ortho latency is shorter, ortho amplitude is smaller....(orthodromic is faster) |
| In sensory nerve studies, prolonged DSL(distal sensory latency) maybe a result of? | demyelination, and/or axonal involvement |
| In sensory nerve studies, decreased amplitude of SNAP(sensory nerve action potential) is a result of? | axonal involvement |
| Slowed SNCV(sensory nerve conduction velocity) is a result of? | demyelination |
| The H-reflex is the electrophysiological counterpart of the _____ reflex. | ankle MSR |
| The H-reflex is only good for what level of radiculopathy? | S1 |
| Repetitive stimulation is done to test for disease of what? | the NMJ(neuromuscular junction) |
Created by:
txst spr 2009
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