For many critically ill patients, the insertion of central venous catheters (CVCs) is necessary to provide routine clinical care. Yet CVC placement comes with appreciable risk: complications such as inadvertent arterial puncture, pneumothorax, bleeding, and bloodstream infections can occur in up to 5-25% of insertions (1, 2). Because the frequency of these complications varies depending on anatomic location of the CVC (internal jugular vein [IJV], subclavian vein [SCV], and the femoral vein [FV]) (1), clinicians weigh the risk profile of each candidate site and select the one best suited to their patients' needs.The SCV was historically a popular choice among acute care physicians for several reasons. Anatomic landmarks that guide SCV cannulation remain prominent regardless of body habitus (3). Furthermore, the SCV is accessible when patients are placed in a cervical spine collar or when the head of the bed is occupied for other resuscitative interventions (such as securing the airway). We cannot deny that SCV cannulation, when compared with the IJV or FV cannulation, carries a higher risk of pneumothorax (2). However, the bold clinician who bears this upfront risk is rewarded with a central line that is more comfortable for patients, easy to care for, and associated with reduced rates of thrombosis and catheter-associated bloodstream infections (4). For these reasons, SCV catheters were granted tenancy in ICUs and emergency rooms.The advent of ultrasound brought about a paradigm shift in CVC insertions. Real-time visualization of the needle as it traverses critical anatomic structures meant fewer complications for critically ill patients with little tolerance for iatrogenic misadventures. For certain anatomical sites such as the IJV and FV, ultrasound guidance streamlined well-established landmark-based insertion techniques. For the SCV, ultrasound guidance was seen as an encumbrance. The clavicle, while a critical landmark for "blind" SCV CVC insertion, obscures the ultrasonographic waves and makes imaging guidance more challenging (5). To visualize the needle, vessel penetration needed to occur at a steeper angle and at a more lateral insertion site near the axillary vein (5). For clinicians, using ultrasound to guide SCV catheterization required an overhaul of previously established practices. In addition, the nuances of image acquisition mandated a higher level of competency and expertise in ultrasound. With ultrasound adoption still in its infancy and operator expertise lacking, the enthusiasm for performing ultrasound-guided SCV catheterization waned.In contrast to SCV CVC insertion, the widespread adoption of ultrasoundguided IJV and FV CVC insertion generated more scientific evidence undergirding its use. Clinical practice guidelines recommended the routine use of ultrasound to guide the insertion of IJV and FV over the SCV (6), further