Pirotesak, S., Neti, W., Weerapong, P., Teeravidja, B., Pangthipampai , P. and Sirivanasandha, B. 2024. Risk Factors for Intraoperative Hypotension in Elderly Patients Undergoing Fast Track Hip Fracture Surgery under Spinal Anesthesia: A Retrospective Observational Study. Siriraj Medical Journal. 76, 7 (Jul. 2024), 454–464. DOI:https://doi.org/10.33192/smj.v76i7.269205.