Repetitive stimulation and late responses Flashcards
(11 cards)
What is pseudofacilitation?
Normal phenomenon likely caused by increased synchronization after the first stimulation causing an increase in amplitude but not area
Why are F responses variable (configuration, latency, amplitude)?
Because different populations of anterior horn cells are activated with each stimulation
An H reflex is found by stimulating what 2 nerves?
Tibial and median
How do you know this is an H reflex and not an F wave?
An F wave is variable
What is a normal side to side onset latency difference with the H reflex?
< /= 1.5 ms
Is the axon reflex a true reflex?
No. It is a small motor potential
Where does an axon reflex occur in relation to M and F responses?
In-between them
What is best for an F wave response: submaximal or supramaximal stimulation?
Supramaximal stimulation
Which is which? Polysynaptic reflex arc vs monosynaptic reflex arc
- H = monosynaptic
- F = polysynaptic
When obtaining an H reflex. At a very low stimulation what will be the first response, a motor (M) potential or an H reflex?
An H reflex. As the stimulus is increased the M potential will appear. As the stimulus further increases, the M potential will increase in amplitude and the H wave will decrease in amplitude.
In what situation are A waves seen?
In reinnervated nerves, especially when submaximal stimulation is given
