Placement of a central venous catheter (CVC) is a common critical care procedure performed by emergency physicians in the Emergency Department (ED.) Numerous studies have shown that physicians are able to reduce the time required, the complication rates, and the number of attempts, and to increase the overall success of CVC placement with the use of ultrasound guidance. Thus, ultrasound guided CVC placement is being increasingly utilized in the ED. The investigators propose a study to investigate the utility of ultrasound guidance for placement of subclavian CVC (SCVC) in the ED.