Ultrasound-guided supraclavicular brachial plexus block: single versus triple injection technique for upper limb arteriovenous access surgery.

Background: Although ultrasound-guided supraclavicular block has a good success rate, it remains unclear whether multiple injections are superior to single injection (SI). We compared the sensory block success rate of SI versus triple injection (TI).

Methods: In this randomized double-blind study, 96 end-stage renal disease patients undergoing arteriovenous fistula creation or superficialization were randomly allocated to receive either SI or TI.

Some epidurographic explanations for incomplete epidural analgesia coverage in the absence of a catheter.

Study Objective: To determine the impact of the plica mediana dorsalis (PMD) on injected contrast media spread in the epidural space.

Design: Prospective interventional study.

Setting: Academic medical center.