Estimating the Usefulness of Inferior Vena Cava Collapsibility Index as a Predictor for Post-Spinal Hypotension in Orthopedic Patients Undergoing Elective Surgery in a Tertiary Care Hospital. - Nandyal, Sitara Raghavan; Sinha, Shweta; Kumar, Arun; Podder, Suvajit; Shetty, Deepali; Mathew, Shaji (AANA Journal, 2026)