Higher success rate with transcranial electrical stimulation of motor evoked potentials using constant-voltage stimulation compared with constant-current stimulation in patients undergoing spinal surgery

During spine surgery, the spinal cord is electrophysiologically monitored via transcranial electrical stimulation motor evoked potentials (TES-MEP) to prevent injury. TES-MEP involves the use of either constant-current or constant-voltage stimulation; however, there are few comparative data available regarding their ability to adequately elicit compound motor action potentials (CMAPs). We hypothesized that the success rates of TES-MEP recordings would be similar between constant-current and constant-voltage stimulation in patients undergoing spine surgery.

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