Faculty Opinions recommendation of Preoperative assessment of optic nerve sheath diameter and heart rate variability to predict intraoperative brain condition in patients with supratentorial tumors: a prospective observational study.

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Abstract
This novel prospective observational study shows that noninvasive tests like computed tomography (CT) grade more than 2, optic nerve sheath diameter measured with ultrasound of greater than 0.63 centimeters and ratio of low frequency to high ratio (LF/HF) of more than 1.8 with heart rate variability monitor can be good predictors of intraoperative brain bulge. This indirectly predicts raised ICP and brain odema that an anesthesiologist may face intraoperatively in elective supratentorial tumour surgery. These noninvasive methods could help anaesthesiologists predict and prepare for tight brain situations that they may encounter intraoperatively in supratentorial elective surgeries.