What Is Electromyography?

normal.

Electromyography is a means of assisting examination of disease through electromyography. Electronic instruments are used to record the electrical activity of muscles at rest or contraction, and electrical stimulation is used to check nerve and muscle excitation and conduction functions. English abbreviation EMG. This test can determine the functional status of peripheral nerves, neurons, neuromuscular junctions, and the muscles themselves.

Name

Electromyography

category

Neuroelectrophysiology

EMG normal values

normal.

Clinical significance of electromyography

Abnormal results:
By measuring the time limit and amplitude of the motor unit potential, the presence or absence of spontaneous electrical activity in quiet conditions, and the wave shape and amplitude of muscle contraction, it is possible to distinguish between neurogenic and myogenic damage, and to diagnose acute and chronic spinal anterior horn damage. (Such as pre-poliomyelitis, motor neuron disease), nerve root and peripheral neuropathy (such as electromyography can help determine the location, extent, extent and prognosis of nerve damage). In addition, it has diagnostic value for nerve entrapment lesions, neuritis, genetic metabolic disorder neuropathy, and various muscle diseases. In addition, EMG is also used to track the recovery process and efficacy of diseases during the treatment of various diseases.
The use of computer technology can be used for automatic analysis of EMG, such as analysis of EMG, single fiber EMG, and giant EMG, etc., to improve the positive rate of diagnosis.
People to check:
(1) Spinal cord disease. (2) Diseases of the peripheral nervous system. (3) Nerve root compression. (4) Myogenic diseases. (6) Neuromuscular junction disease. (6) Cone system and extrapyramidal diseases.

EMG examination considerations

Before inspection:
Testing for bacteremia in regular hospitals, because electromyographic measurements of bacteremia patients may sometimes cause bacterial endocarditis in patients with heart valves. Hemophilia or marked reduction of platelets or abnormal clotting time should be avoided. For hepatitis B surface antigen-positive patients, use disposable concentric needle electrodes to avoid cross infection.

The drug should be discontinued before the test, such as neostigmine should be discontinued 16 hours before the test.
When checking:

There is a certain amount of pain and injury during the inspection, so this inspection should not be abused unless necessary. In addition, the examination requires that the muscles can be completely relaxed or exerted with varying degrees of force.

Muscle biopsy and measurement of muscle enzymes should be avoided for muscles that have just undergone EMG.

Not suitable for people; patients with bacteremia, patients with hemophilia, patients with hepatitis B

EMG examination process

During the inspection, electrodes are inserted into the muscle, and the biological current in the resting and contracted state of the muscle is amplified by the amplification system, and then displayed by the cathode ray oscilloscope.

Electromyography related diseases

Idiopathic tremor, Lambert-Eton syndrome, lipid deposition myopathy, inclusion body myositis and hereditary inclusion body myopathy, neuromuscular rigidity, dystrophic polyneuropathy, vitamin E deficiency neuropathy, capillaries Vasodilatation ataxia syndrome, progressive hypertrophic interstitial neuritis, hereditary ataxia polyneuritis

Electromyography- related symptoms

Faint and heavy, calf muscle spasm, thigh muscle atrophy, breast muscle atrophy, neck muscle swelling and hardening, arm muscle strain, muscle atrophy, traumatic low paraplegia, gluteal muscle paralysis gait, bending over Back pain