A DOSE-RESPONSE STUDY COMPARING TWO DOSAGES OF HYPOBARIC BUPIVACAINE (WITH FENTANYL 25 MCG) FOR UNILATERAL SPINAL AN ANAESTHESIA IN HIP FRACTURE SURGERY. A RANDOMIZED DOUBLE BLIND PROSPECTIVE COMPARATIVE STUDY OF 5 MG VERSUS 7.5 MG. Journal of Pharmaceutical Negative Results, [S. l.], p. 2312–2319, 2022. Disponível em: https://pnrjournal.com/index.php/home/article/view/5789.. Acesso em: 8 jun. 2026.