Single Fiber EMG

Single-Fiber Electromyography

Single-fiber electromyography (SFEMG) is a selective EMG recording method that identifies action potentials (APs) from specific muscle fibres.

What is the procedure for a Single Fiber EMG Test?

The Single Fiber EMG test will be performed by a consultant neurologist and may take up to two hours. To begin, you will be questioned about your medical history (namely, your symptoms and medicines), and the test will be properly explained. Throughout the test, you will be asked to lie down and relax, and a small needle electrode will be put into the muscle in your forehead above your eyebrow. The needle electrode will be left in place during the test to record muscle activity.

Once the Single Fibre EMG test is done, you may return home and continue your daily routine. There may be some bleeding or bruising where the needle was placed. Apart from that, there are no negative side effects to single-fiber EMG.

Uses of Single Fiber EMG Test

Single-fiber electromyography (SFEMG) is most useful clinically in patients with suspected myasthenia gravis (MG) who have normal findings from other neuromuscular transmission tests and acetylcholine receptors (AChR) antibody levels. FEMG may also be used to estimate fiber density, which is used to evaluate the focal organization of the motor unit.

Some investigations investigated the prognostic usefulness of SFEMG in identifying patients with ocular myasthenia gravis, but the results were inconclusive. According to one study, a greater jitter value in the orbicularis oculi muscles was associated with more illness exacerbations. Other neuromuscular transmission diseases such as Lambert Eaton myasthenic syndrome (LEMS) and botulism may also be treated with SFEMG. Jitter is significantly elevated in LEMS, and it is frequently out of proportion to the degree of the weakness, with frequent impulse blockage. Jitter, fiber density, or both are elevated in 70% of motor neuron diseases when no other abnormalities can be found by normal EMG.

What are the advantages of EEG?

  • They are a very rapid, relatively inexpensive, and safe method of testing the functioning of several brain regions.
  • Accurate time measurements
  • Today’s EEG equipment can detect brain activity with a resolution of one millisecond.
  • EEG electrodes simply adhere to the scalp. As a result, it is a non-invasive process.
  • In comparison to other technologies, EEG equipment is generally affordable and easy to use.

For more information & consultation on Single Fiber EMG , Call our expert Dr. Amit Shah – Consultant Neurologist in Mumbai on 98195 61456 or Book an Appointment