Continuous Spinal Anesthesia Versus Epidural Anesthesia in Geriatric

The Catheter will be then fed over the needle into the intrathecal space and Inserted 3cm cephalad into the subarachnoid space.The spinal needle and the modified Tuohy needle will be then removed, and a Luer connector and A filter previously filled with the anesthetic solution will be attached to the Catheter (priming volume 0.6ml). Plain bupivacaine 0.5% in 20ml vials will Be used CSA group received 1 ml(5 mg) of plain bupivacaine (0.5%) Together with fentanyl l25μg injected via the catheter at a rate of 0.2ml/15s. The level of the resulting sensory blockade will be tested using pin prick.

The needle is advanced until the epidural space is identified by the loss-of-resistance technique, and then a 20G catheter is inserted 3 cm cephalad into the epidural space. a test dose of 3ml of 2% lignocaine with adrenaline (1:200000) will be injected into the catheter. Three minutes later, 10 ml of plain bupivacaine (0.5%) together with fentanyl l50μg will be injected via the catheter.