Comparison of Three Different Sitting Positions for Performing Combined Spinal-Epidural Anesthesia

Patients in groups will be positioned according to the study groups for performing combined spinal epidural anesthesia.

After positioning, a combined spinal epidural anesthesia (CSE) will be applied using a CSE Tuohy Needle (18 G) and 27 G Whitacre spinal needle via needle - through needle technique. The epidural space will be located with loss of resistance to saline. 3 ml hyperbaric bupivacaine 0.5% (15 mg) will be given for spinal anesthesia after identification of subarachnoidal space.