Comment on

• Interscalene perineural catheter placement using an ultrasound-guided posterior approach.

  Mariano ER, Loland VJ, Ilfeld BM. Mariano ER, et al. Reg Anesth Pain Med. 2009 Jan-Feb;34(1):60-3. doi: 10.1097/AAP.0b013e3181933af7. Reg Anesth Pain Med. 2009. PMID: 19258989 Free PMC article.
• Ultrasound-guided posterior approach for the placement of a continuous interscalene catheter.

  Antonakakis JG, Sites BD, Shiffrin J. Antonakakis JG, et al. Reg Anesth Pain Med. 2009 Jan-Feb;34(1):64-8. doi: 10.1016/AAP.0b013e3181933a53. Reg Anesth Pain Med. 2009. PMID: 19258990