Fig. 6
From: The role of spinal cord neuroanatomy in the variances of epidural spinal recordings
Medio-lateral movement of the stimulation lead may lead to extra muscle recruitment. Representative data from subject S1. A Diagram of implanted epidural leads before and after a minimal medial to lateral shift of approximately ~2.9 mm. Contact 11 (white square) on the second lead indicates the recording channel for reported ESR waveforms. Circular markers on the epidural stimulation lead indicate electrode contacts as either anode (yellow) or cathode (red). B Recorded ESRs with responses detected in ECAP window (1-2.5 ms) and EMG window (3-13 ms) and, C intramuscular EMG (IM) recordings were represented as 300 individual traces with a median trace overlay at motor threshold at the medial lead position, 2.0 mA. EMG window for intramuscular recording is also 3-13 ms. RMS was calculated for ECAP window and EMG window of the recorded ESRs and intramuscular recordings in evaluating changes in evoked responses