One of pur vascular nurse placed a PICC line the other day and had a good 3cg or ECG reading. The redaing looked perfect. However, we got a call yesterday that CXR done for a different reason was showing that PICC needs to be retracted about 7 cm. We retracted it and had another CXR taken and it showed that it was the tip was at the SVC. What do you think caused this contrasting result between the ECG and CXR? We use the ECG at work to minimize the use of cXR post PICC placement.