How many times have you had a patient that needs IV access, but none can be obtained by traditional visualization or even blind technique, even by the most experienced operators (i.e. the IV team)?
What do you do next? Attempt a central line instead? Not necessarily! Instead, much like arterial lines, you can use ultrasound (US) to help with venous cannulation.
Please watch this screencast on US guided peripheral IV insertion (done by Dr. Vince Lau).