Electromyografie
Electromyography (EMG) is a diagnostic technique for evaluating and recording the electrical activity produced by skeletal muscles and the nerves that control them. EMG helps diagnose neuromuscular disorders, assess muscle function, and guide rehabilitation. In practice, EMG can be performed with surface electrodes that measure activity from broad muscle regions (surface EMG) or with fine needles inserted into a specific muscle (intramuscular or needle EMG). Nerve conduction studies (NCS) are commonly performed together with EMG to test the integrity of peripheral nerves.
During needle EMG, a clinician inserts a needle electrode into muscle and records motor unit action potentials
Interpretation: Findings can indicate denervation, reinnervation, myopathy, or neuropathy. For example, abnormal spontaneous activity at rest
Applications: diagnosis of radiculopathy and peripheral neuropathies, motor neuron disease, myopathies, and neuromuscular junction disorders; assessment
Limitations and safety: needle EMG can cause transient discomfort and carries minor risks of bleeding or infection;