Monitoring of motor and somatosensory systems in a 26-week pregnant woman.

INTRODUCTION: We report the case of a 34-year-old woman who was 26 weeks pregnant and needed a brain surgery. METHODS: We performed intraoperative neurophysiological monitoring (IONM) with motor-evoked potentials (MEP) elicited by transcranial electrical stimulation and somatosensory-evoked potentials (SSEP). Additionally, uterine myometric tone from the mother and fetal heart rate were also monitored. Forty-three MEP and 35 SSEP trains were applied (energy delivered, 2.35 and 0.45 J, respectively). FINDINGS: No changes related to electrical stimulation in either uterine muscle tone or fetal heart rate were observed. No motor or new somatosensory deficits appeared. CONCLUSION: Our findings suggest that IONM can be safely applied in pregnant women.