Randomized Controlled Trial
A prospective, randomized, double-blind comparison of ultrasound-guided axillary brachial plexus blocks using 2 versus 4 injections.
Anesth. Analg. 2010 Apr 1;110(4):1222-6.
Randomized Controlled Trial
Decreasing the local anesthetic volume from 20 to 10 mL for ultrasound-guided interscalene block at the cricoid level does not reduce the incidence of hemidiaphragmatic paresis.
Reg Anesth Pain Med. 2011 Jan 1; 36 (1): 17-20.
Comparative Study
Effects of age on minimum effective volume of local anesthetic for ultrasound-guided supraclavicular brachial plexus block.
Acta Anaesthesiol Scand. 2013 Jul 1;57(6):761-6.