ABSTRACT
Electrodiagnostic (EDX) studies have been used successfully to identify or to refute a neuromuscular pathology to explain the patient symptoms. EDX studies are oen performed in conjunction with other diagnostic procedures such as imaging, blood work, nerve or muscle biopsy. A dierential amplier is used for signal recordings are requires three recording electrodes: active, reference, and ground. e amplier measures the voltage dierence between the potentials recorded by the active and reference electrodes. In the motor nerve conduction stud, surface electrodes are used to record the activity from a muscle innervated by the tested nerve. A two-channel montage is used with recording electrodes placed behind the ears and over the mastoid process. A reference electrode is placed over the center of the skull. Biomedical engineers have made major contributions to make EDX a powerful diagnostic tool.
