There was a study published on the Journal of Critical Care Medicine in July 2011 comparing US guided vs landmark approach to subclavian vein central line placement. In the study, “subclavian vein cannulation was achieved in 100% of patients in the ultrasound group as compared with 87.5% in the landmark one.” The ultrasound group also resulted in decreased access time and complications such as pneumothorax, aterial puncture, hematoma, and hemothorax. The authors concluded “that ultrasound-guided cannulation of the subclavian vein in critical care patients is superior to the landmark method and should be the method of choice in these patients.”
A recent study published in the Annals of the American Thoracic Society reports using a micro-convex pediatric probe to attain a better ultrasound guided approach to subclavian catherization given the difficulty in attaining a great view in this anatomical region.
Please see link below:
Fraqou M et al., Real-time ultrasound-guided subclavian vein cannulation versus the landmark method in critical care patients: a prospective randomized study., Crit. Care. Med. 2011 July;39(7):1607-1612.
Lanspa et. al., Ultrasound-guided Subclavian Vein Cannulation Using a Micro-Convex Ultrasound Prob., Ann Am Thorac Soc. 2014 May;11(4)583-586.