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electrodiagnosis 1 - Coggle Diagram
electrodiagnosis 1
electrodiagnosis
Explain Faradic galvanic test.
Explain Strength duration Curve test.
Procedure of Strength Duration curve test.
Introduction of Electro myography (EMG) and Nerve conduction studies.
Basics EMG Bio feedback.
Reduction or loss of voluntary power of a muscle may be due to:
- A lesion of the upper motor neurone
- A lesion of the lower motor neurone
- Damage to the muscle itself
- A fault at the neuromuscular junction
- A functional disorder
goal
the goal of EDS is to determine id there is a problem along the peripheral NS pathway
& if so, where the problem is:
eg of locations of possible lesions & associated diagnoses include:
- motor nerve cell body (ant horn cell)- amyotrophic lateral sclerosis
- root- cervical or lumbar radiculopathy
- axon- toxic neuropathy
- myelin - Gullien- Barre syndrome
- NM junction- myesthenia gravis
- muscle- muscular dystrophy
UML
- A normal response is obtained with ES.
- Sometimes the nerve and muscle are hyper-excitable and react to a lower intensity of current than that normally required.
LMN
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Neurapraxia
Axonotmesis
Neurotmesis
- alternations in the electrical reactions occur.
- once the nerve fibres have degenerated,
alternations in the electrical reactions occur.
- ES to the affected muscle - normal response.
- But loss of response if stimulus applied to the nerve trunk above the lesion.
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Muscle lesions
- Weakness or disease of the muscle
- The reactions to ES are of normal type,
but are reduced in strength.
- Absence of response - ischaemic contracture, advanced stages of the myopathies,
firbrosis of muscles in long standing denervation.
Functional disorders
- Hysterical paralysis
- No alternation in the electrical reactions.
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- Strength-Duration curves
- F-G test (Faradic-Galvanic test)
- EMG (Electromyography)
- NCS (Nerve Conduction Studies)
- Evoked Potentials
Terms
Action potential
- this is the waveform you see on the screen
(in order to give more details about what you are describing, more specific terms may
include compound nerve action potential, compound motor action potential,
sensory nerve action potential, etc.)
Latency
- time interval between the onset of a stimulus and the onset of a response
(can also be referred to as a motor latency or a sensory latency).
Amplitude
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Conduction velocity
how fast the fastest part of the impulse travels
(can also be referred to as a motor conduction velocity or a sensory conduction velocity).
F wave
a compound ms action potential evoked by antidromically stimulating a motor nerve frm a ms using maximal electrical stimulus.
it represents the time required for a stimulus to travel antidromically toward the spinal cord & return orthodromically to the ms along a very small percentage of fibers.
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Precautions
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Contraindications
Severe bleeding disorder
Out of control anticoagulation therapy
Automatic implanted cardiac defibrillators
Cardiac pacemaker
Active skin/soft tissue infection
compllications
- infection
- bleeding
- accidental penetration of the needle into something other than the intended ms