2. When it is needed?
1. A patient is complaining of numbness.
2. A patient is complaining of tingling (paresthesias).
3. A patient has pain.
4. A patient has weakness.
5. A patient has a limp.
6. A patient has muscle atrophy.
7. A patient has depressed deep tendon reflexes.
8. A patient has fatigue.
3.
4. REACTION OF REGENERATION TEST
F-G TEST
Faradic response-innervated muscles
Galvanic response- innervated /denervated
Wallarian degeneration and degeneration
7. CHRONOXIE & RHEOBASE
1. The root word “rheo”
means current and “base”
means foundation: thus the
rheobase is the foundation,
or minimum, current
(stimulus strength) that will
produce a response.
2. The root word “chrona”
means time and “axie” means
axis: chronaxie, then, is
measured along the time axis
and, thus, is a Duration that
gives a response when the
nerve is stimulated at twice
the rheobase strength.
9. NERVE EXCITABILITY TEST
MONOPHONIC PULSED CURRENT IS USED
Between normal and affected side stimulation
amplitude difference
chronoxie amplitude
0.3 ms 3.5mA
1.0 ms 2mA
10. EMG-MUAP
A motor unit is defined as one
motor neuron and all of the muscle fibers it
innervates. When a motor unit fires, the
impulse (called an action potential) is
carried down the motor neuron to the
muscle. The area where the nerve contacts
the muscle is called the neuromuscular
junction, or the motor end plate. After the
action potential is transmitted across the
neuromuscular junction, an action potential
is elicited in all of the innervated muscle
fibers of that particular motor unit. The sum
of all this electrical activity is known as a
motor unit action potential (MUAP)
27. INDICATIONS
Diseases of muscle, Neuropathy
nerve and NMJ Myopathy
Radiculopathy
Myelopathy
28. FINDINGS OF EMG
fibrillation+ PSW-acute High frequency
unresolved nerve injury dicharge- many causes
Fasciculation – problem Large MUAP-chronic
in nerve cell body or axonal injury due to new
spinal cord terminal branches
>5to7mV
Small MUAP-myopathy
< 1mV
