The supraclavicular block can provide effective surgical anesthesia of the forearm and hand.
There have been many different approaches to ultrasound-guided supraclavicular brachial
plexus block (US-SCBPB) according to the needle injection site (e.g. corner pocket approach,
cluster approach) or number of needling (single or double injection). Numerous studies
demonstrates good results (e.g. faster onset time) when using double injections rather than
single injection. But double injection does not guarantee complete sensory block because
ulnar nerve tends to be spared by its anatomical location.