Repetitive stimulation and late responses Flashcards
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
