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 SR; Sinha S; Hd AK; Podder S; Shetty D; Mathew S (AANA journal, 2026)