HYPOBARIC BUPIVACAINE (WITH FENTANYL 25 MCG) FOR UNILATERAL SPINAL AN ANAESTHESIA IN HIP FRACTURE SURGERY: A DOSE-RESPONSE STUDY COMPARING TWO DOSAGES. 5 MG VERSUS 7.5 MG. Journal of Pharmaceutical Negative Results. Published online December 30, 2022:2302-2311. doi:10.47750/pnr.2022.13.S04.284