“COMPARISON OF THE PLETH VARIABILITY INDEX, PERFUSION INDEX, AND PULSE PRESSURE VARIABILITY FOR FORECASTING HYPOTENSION DURING LARGE ABDOMINAL OPERATIONS UNDER GENERAL ANAESTHESIA” (2021) International Research Journal of Pharmacy, 12(2), pp. 27–31. Available at: https://irjponline.org/index.php/irjp/article/view/3053 (Accessed: 25 May 2026).