Arterial lines stop working

I’ve had a case recently we’re my radial art line stopped working mid case. Attending thought I punctured at too steep an angle, but I’ve always used about 45 degree angle and then flattened. I generally use the arrow radial kits. Anyone have an idea about why arterial lines stop working, or am I actually going too steep?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums