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Electromyography

Clinical Applications of EMG: – Needle EMG is used for diagnostics in neuromuscular diseases. – EMG signals guide injections like botulinum toxin and phenol. – […]

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Clinical Applications of EMG:
– Needle EMG is used for diagnostics in neuromuscular diseases.
– EMG signals guide injections like botulinum toxin and phenol.
– Surface EMG aids in functional diagnosis and motion analysis.
– EMG is used to control prosthetic devices.
– Acceleromyograph monitors neuromuscular function in anesthesia.

EMG Technique and Safety:
– Skin preparation is crucial before needle electrode insertion.
– Proper needle placement is essential for accurate muscle representation.
– No known contraindications exist for performing EMG on pregnant patients.
– Caution is advised for patients with lymphedema during EMG procedures.
– Cardiac devices like pacemakers do not pose safety hazards during EMG.

EMG Electrodes and Procedures:
– Different types of recording electrodes are used for surface and intramuscular EMG.
– Monopolar and concentric needle electrodes are commonly used.
– Intramuscular EMG involves evaluation of insertional and resting activity.
– Single Fiber EMG is a sensitive test for neuromuscular junction dysfunction.
– Specific electrode placements and tests minimize risks in EMG.

EMG Signal Processing and Analysis:
– EMG signals consist of superimposed motor unit action potentials (MUAPs).
– Various methods have been proposed for EMG signal decomposition.
– Rectification translates raw EMG signals into signals with a single polarity.
– Limitations exist in needle EMG due to voluntary muscle activation.
– Muscle cross-talk can affect the reliability of EMG signals.

EMG Research and Technological Innovations:
– EMG signals can control prostheses, flight systems, and electronic devices.
– EMG is used in unvoiced speech recognition and controlling computers and robots.
– EMG is applied in various research fields like biomechanics and clinical neurophysiology.
– Innovations include EMG technology in virtual reality, gaming, and neural interfaces.
– Companies like Facebook and startups like Emteq Labs are involved in EMG technology advancements.

Electromyography (Wikipedia)

Electromyography (EMG) is a technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyograph to produce a record called an electromyogram. An electromyograph detects the electric potential generated by muscle cells when these cells are electrically or neurologically activated. The signals can be analyzed to detect abnormalities, activation level, or recruitment order, or to analyze the biomechanics of human or animal movement. Needle EMG is an electrodiagnostic medicine technique commonly used by neurologists. Surface EMG is a non-medical procedure used to assess muscle activation by several professionals, including physiotherapists, kinesiologists and biomedical engineers. In computer science, EMG is also used as middleware in gesture recognition towards allowing the input of physical action to a computer as a form of human-computer interaction.

Electromyography
EMG from gait termination, bottom left is the raw EMG, right is the rectified pattern
ICD-9-CM93.08
MeSHD004576
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