Electrociagnostic Study (EDX)
What is EDX?
EDX Includes NCS and EMG
What is NCS?
Nerve conduction study (NCS) is the test to check neuropathy, nerve damage or nerve disease; nerve entrapment or demyelinating changes.
What is EMG?
Electromyography (EMG) to check nerve impingement that is radiculopathy; neuropathy that affects nerve axon; or muscle disease also called myopathy or myotonic dystrophy.
What is the limitation of NCS?
Sometimes patient feels pain but EDX normal, suggest Postganglionic nerve damage, or at early stage the nerve damage is not severe enough to be checked out, or C-fiber neuropathy.
Needs good skills and training to perform the test.
What is the limitation of EMG?
Surrounding machine interferences cause difficult wave reading.
Not only read waves but need good training to hear spontaneous waves.
Need clinical correlation.
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