Comparison of Ultrasound-Guided Infraclavicular Block and Ultrasound-Guided Axillary Block

Ultrasound-guided single injection infraclavicular block: using an in-plane technique, 30 mL of mepivacaine 1.5% is injected at the posterior aspect of the artery.

Ultrasound-guided double injection axillary block: using an in-plane technique, 25 mL of mepivacaine 1.5% is injected postero-medial to the artery. During needle withdrawal, 5 mL of the same solution is injected close to the musculocutaneous nerve.