“…Hence, the rate of success was limited, and it was somewhat like an art of the skilled hands. However, as a result of the advance of ultrasound machine technology (Asakura, et al, 2008b), the anesthesiologists come to perform peripheral nerve block with more than 90% rate of success virtually without any complications. As such, ultrasound-guided peripheral nerve block has come to gain popularity recently worldwide (Marhofer et al 2007).…”