In this prospective randomized observational study, investigators aim to compare the efficacy and procedural outcomes of real-time ultrasound guided parasagittal oblique (RTU-PO) and real-time ultrasound guided paramedian transverse (RTU-PT) approaches in elderly patients undergoing elective surgery under spinal anesthesia.
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Incidence of successful Dural puncture on the first needle insertion attempt
Timeframe: At the begining of the procedure (during the needle insertion)