Practical- Neurophysiology Flashcards
(5 cards)
1
Q
In order to calculate conduction velocity what values must be found?
A
Distance between wrist and elbows
Latency times values for both elbow and wrists
Speed= distance / difference between latency times
2
Q
What factors can hinder conduction velocity?
A
Myelination
Axon diameter - if compressed
Ambient temperature (hypothermia)
3
Q
If there’s nerve compression what values will it affect
A
Increase conduction delays between distances
4
Q
What could it suggest if there’s absence of EMG action potential
A
Median nerve damaged or device is broken
5
Q
What is included in the latency time?
It doesn’t show true latency time
A
Activation time
Conduction delay from cathode to NMJ
Delay at NMJ
Conduction delay from muscle fibres to EMG recording electrodes.
