Application of SSEP probes to bilateral ulnar and popliteal nerve areas with sensors at (1) bilateral brachial plexus (clavicles), (2) Erb's point (posterior C8 cervical spine) and (3) on forehead will permit microvolt current to to be detected and analyzed against a proprietary algorithm. Neuropraxia will be detected based on abnormalities developing in received SSEP signals.