%0 Journal Article %T A comparison of longitudinal and transverse approaches to ultrasound-guided axillary vein cannulation by experienced operators %A Du-Ming Zhu %A Jie-Qiong Song %A Ming Zhong %A Wei Wu %A Yi-Zhou He %J SCIE-indexed Journal %D 2017 %R 10.21037/jtd.2017.03.137 %X Central vein cannulation is very important in critical care unit. A variety of situations need central venous access include the need to administer medications and to monitor hemodynamic status. In many cases, such as obesity, thoracic deformity, and emergency status, the landmark method is a challenge and has a high incidence of complications (1,2). In the central line placement with the application of ultrasound, the puncture under direct vision, can significantly reduce complications, including pneumothorax, arterial injury and nerve damage, significantly improve patient safety (3-5). In previous studies, ultrasound method had a superior advantage in the jugular vein and femoral vein cannula compared to the landmark method (6,7). However, each venipuncture method has its own limitations. The internal jugular vein is difficult to insert in patients with tracheotomy. Moreover, due to tracheotomy, patients have a high infection rate. The femoral method is the easiest and most time saving, can be used for emergency rescue. However, due to the anatomical location of the factors, patients are particularly vulnerable to infection (8-10). The subclavian method has many advantages, including ease of care, low infection rate, especially for patients with severe. Because of the clavicle effect, subclavian vein cannot be seen easily, so most operators still use the landmark method. However, landmark method has many drawbacks, including pneumothorax, arterial injury, hematoma (11). The complications of pneumothorax and arterial injury are very common and serious and endanger the lives of patients. Ultrasound-guided cannulation is a novel option to the axillary veins (12). The aim of this study is to find out which transducer orientation, longitudinal or transverse, is better for imaging the axillary vein with ultrasound %U http://jtd.amegroups.com/article/view/12958/html