elektromyografinervledningsstudier

Elektromyograf, or electromyograph (EMG), is a device and method for recording electrical activity produced by skeletal muscles. It provides information about muscle function and the health of the nerves and muscles controlling movement.

Two main approaches exist: intramuscular EMG, using fine needle electrodes inserted into a muscle, and surface EMG, recording from skin-mounted electrodes over a muscle. Signals are amplified, filtered, and displayed as waveforms; sometimes auditory feedback is provided.

EMG is frequently performed together with nerve conduction studies (NCS) to assess the health of peripheral nerves. The combination helps localize lesions to nerves or muscles and gauge their severity.

Applications include evaluation of neuromuscular disorders such as radiculopathy, neuropathy, myopathy, and motor neuron disease; monitoring during surgery or rehabilitation; and research in physiology and sports science.

Safety and interpretation: The procedure is done by trained clinicians. Needle EMG may cause brief discomfort and a small risk of bleeding or infection. Findings must be interpreted in the context of clinical history and other tests; EMG does not measure muscle strength directly.