A Correlational Study to Analyze the Effect of Decrease in Mean Arterial Pressure on Cerebral Oxygen Saturation in Hypertensive Patients during Hypotensive Anesthesia for Transsphenoidal Surgery - Keerthana Vijayakumar; Neerja Bharti; Shiv Lal Soni (Journal of Neuroanaesthesiology and Critical Care, 2025)