![]() It is commonly used for NCS 1 and is necessary to ensure that all axons have been evaluated in the study. ![]() A stimulus with sufficient strength to cause all of the axons to depolarize and propagate an AP is termed supramaximal stimulation. A stimulator electrode consisting of a cathode and anode is used to deliver an electrical stimulus of variable intensity and duration. 22 The course of the specific peripheral nerve being studied is identified using anatomical landmarks and knowledge of neuroanatomy. Contrary to popular teaching, the ground electrode does not direct stray charges away from the body and serves only to minimize interferences with the recording electrodes. A ground electrode is used to help minimize electrical interference from the equipment, ambient surroundings and the patient. The recording of nerve signal transmission occurs at the surface of the skin using specialized electrodes. This is performed by recording action potentials (APs) for all the axons that compromise a peripheral nerve. Nerve Conduction Studies (NCSs) are a method to perform an extracellular recording of the intracellular process of neuron or muscle depolarization and action potential propagation along the axon or muscle fiber 1.
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