Ultrasonographic Evaluation of Inferior Vena Cava: Aorta Index with a Cut-off Value of 1.0 as a Predictor for Hypotension after Induction of General Anesthesia; An observational study. Kathmandu Univ. Med. J. 2022;20(2):171-177. doi:10.3126/kumj.v20i2.51174