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. 2023 Feb 22;12(5):1753. doi: 10.3390/jcm12051753

Figure 3.

Figure 3

Case example of a reversible mTc-MEP warning for both surface and subcutaneous needle recording electrodes. A case example of patient 19 of Table 4. mTc-MEPs are recorded for the left and right TA with both surface and subcutaneous needle recording electrodes. The 15-year-old patient underwent scoliosis correction surgery by an anterior retroperitoneal approach due to a congenital hemivertebrae of S1. Preoperative left and right TA strength was intact (MRC 5). The left TA amplitudes disappeared at the same time for both recording electrodes. A warning was communicated to the surgeon. Traction on the frame was removed, and the blood pressure was raised after which the mTc-MEP amplitudes returned to normal. The patient woke up with a transient paresis (MRC 4) of the left TA which improved in a couple of days to an MRC 5. TA, tibialis anterior; BP, blood pressure.