Comment on

• Ultrasonographic guidance improves the success rate of interscalene brachial plexus blockade.

  Kapral S, Greher M, Huber G, Willschke H, Kettner S, Kdolsky R, Marhofer P. Kapral S, et al. Reg Anesth Pain Med. 2008 May-Jun;33(3):253-8. doi: 10.1016/j.rapm.2007.10.011. Reg Anesth Pain Med. 2008. PMID: 18433677 Clinical Trial.