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Physiologic monitors designed for continuous measurement and display of information at a central station of the electrical potential of skeletal muscle and its associated electromyogram (EMG). This information is taken from a distant location through a point-to-point radio or other appropriate communication link (i.e., telemetric). These monitors typically consist of a small electronic unit with a display that is connected, by several detachable lead wires, to skin surface (or by needle electrodes inserted into specific muscles) to carry the electrical signal from the muscles to the transmitter. The telemetric monitor also includes a pocket-sized, battery-powered transmitter that is clipped to the patient\'s gown (or carried in a pouch) and a receiver that is integral or associated to the central station where the information is displayed. Telemetric EMG monitors are used in patients with neurologic conditions (e.g., cerebral palsy, stroke) and to re-educate muscle after surgery, to identify malfunctioning muscles in cases of soft tissue injury (e.g., strain) or chronic pain (e.g., myofascial pain syndrome), and to evaluate overuse or ergonomic problems that arise at work or during participation in sports.
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