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Electrophysiology

Never conduction studies

QuestionAnswer
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