Comparison of spinal block characteristics and intraoperative haemodynamic parameters in ten degree reverse Trendelenburg position and supine position in patients undergoing lower limb arthroscopic surgery.

This study is a prospective, interventional, comparative randomized study To compare the spinal block characteristics and intraoperative haemodynamic parameters in ten degree reverse Trendelenburg position and supine position in patients undergoing lower limb arthroscopic surgery. In supine (S) group, immediately after the administration of drug into the subarachnoid space the patient will be put into supine position with the operating table parallel to the floor. In reverse Trendelenburg (RT) group, immediately after the administration of drug into the subarachnoid space the patient will be put into supine position with the operating table tilted ten degrees upwards with respect to the floor. The level of spinal block will be assessed bilaterally in the midclavicular line using the cold touch method with an alcohol swab every 30 seconds until onset of sensory block. Maximal level of sensory block defined as number of spinal segments blocked above T12 at 20 min after administration of drug into subarachnoid space. Surgical intervention will begin after adequate level of sensory block is achieved for the surgical procedure. Patients will be monitored throughout the surgery and readings of heart rate, systolic, diastolic and mean arterial pressure and oxygen saturation will be noted at time of spinal block, at 2 mins, 5 mins ,10 mins, 20 mins and 30 mins, thereafter every 15 mins till the end of surgery. Any episode of bradycardia or hypotension will be noted and managed accordingly. Intra operative blood loss, requirement of IV fluids

and blood products will be monitored.