Pulse-width Modulation During Pedicle Screw Stimulation
Objective: The aim of this project is to modulate the pulse-width (PWM) during stimulation of pedicle screws, and record the response thresholds associated with each PWM setting. The relationship between pulse-width and threshold will then be analyzed Methods: Upon completion of the pedicle screw placements, each screw will be stimulated utilizing three different pulse-width settings, 0.4 milliseconds, 0.2 milliseconds, and 0.05 milliseconds. The stimulation intensity required to elicit a compound muscle action potential (CMAP) will be recorded for each pulse-width parameter.
