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Electromyoneurography (EMNG)

Autor: dr Sonja  Ilić   


Electromyoneurography (EMNG) is a modern neurophysical method of examining muscles, neuromuscular links and peripheral nerves.

It is based on the characteristic of a muscle, which produces active potentials that can be registered by the apparatus-electromyography through electrodes which are stuck in a muscle or through electrodes which are inserted into special muscle fibres (micro electromyography or EMG of a muscle). We usually use so-called needle-electrode which enables the examination of a motor unit. In a narrow needle (cannula), which resembles an injection needle, the wire is made of platinum, and electrical potentials are stated between the cannula and the wire.  The electrode is linked with an electrograph, which is in fact a differential amplifier equipped with a cathodic pipe (oscilloscope) for a visual image and intensified electrical potentials.

By simultaneous or successive registering of active potentials when a body makes passive or active movements (polyelectromyography), an insight is made in a full mobility of a patient which is important for rehabilitation plan. For a patient, electromyography is painless and it is easily bearable.

A healthy muscle gives potentials in cases of activity, when it is in a passive state, ’electrical silence’

In pathological cases, spontaneous potentials can be registered in passive states of muscle fibrillations and fasciculation as a sign muscle of denervation and changed active potentials and contraction.

According to these signs, electromyograficist can positively diagnose the following diseases: muscular dystrophy, polymiositis, myopathy, and myotonia, insufficiency of neuromuscular synapses (myasthenia gravis, myasthenia syndromes), lesions of spinal cord roots and lesions of peripheral motor and sensitive nerves

Sonja Ilic, MD

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