This prospective randomized controlled study will be conducted to compare the effect of fractionated SA using isobaric and hyperbaric bupivacaine with fractionated SA using hyperbaric bupivacaine and the conventional SA on hemodynamic instability in orthogeriatric patients undergoing hip fracture surgeries.
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Incidence of intraoperative hypotension
Timeframe: MAP will be measured intraoperatively before spinal anesthesia (SA), immediately after administering SA and subsequently at regular intervals 5, 10, 20, 30, 60, 75, 90 minutes, and then every 30 minutes till the end of surgery.