Joshi G, Gandhi K, Shah N, et al : Peripheral nerve blocks in the management of postoperative pain : challenges and opportunities. J Clin Anesth 2016 ; 35 : 524-29
Riazi S, Carmichael N, Awad I, et al : Effect of local anaesthetic volume (20 vs 5 mL) on the efficacy and respiratory consequences of ultrasound-guided interscalene brachial plexus block. Br J Anaesth 2008 ; 101 : 549-56
Lee JH, Cho SH, Kim SH, et al : Ropivacaine for ultrasound-guided interscalene block : 5 ml provides similar analgesia but less phrenic nerve paralysis than 10 ml. Can J Anaesth 2011 ; 58 : 1001-6