The nerve conduction studies and electromyography become essential tools in the diagnosis of neurological disorders. These electrophysiological studies may be obscured by many technical or physiologic errors. Proper performance of electrophysiological study must be preceded its interpretation of clinical implication. Physicians and technicians must know various technical and physiologic factors affecting these neurophysiologic studies and have the ability to find the problematic factors and to adjust them for optimal studies.
