critical care medicine
How To Do Radial Artery Cannulation, Ultrasound Guided
Warnings and Common Errors for US Guided Radial Artery Cannulation
Once the needle punctures the skin, it is no longer helpful to inspect the wrist. Instead, look at the ultrasound screen and move the probe to look for the needle tip. During cardiopulmonary arrest or other conditions of low blood pressure and hypoxia, arterial blood may be dark and not pulsatile and may be mistaken for venous blood. 