PICC line pulled back in (?)

[99nicu.org]

There was an interesting discussion in the 99nicu Slack channel, we'd like to share here, posted by @rehman_naveed

Quote

 

a PICC inserted and secured, good position. After 3 days CXR done for pulmonary reasons and surprisingly PICC pulled in cross the heart, liver and went down in IVC quite lower down. Pulled back and again over night pulled in.

Do you have ever such experience? Any thoughts why it pulled in, what force drive it in. 
I never seen such a phenomenon that PICC pulled in to such an extent?

 

The following comments reported a similar episode with a UVC, but alternative explanations were the human factor (was the PICC really backed as intended) and the possibility of material stretching (could the PICC line plastic be stretched while backing?) Also, the possibility of PICC line displacement with arm position was also raised (see https://www.ncbi.nlm.nih.gov/pubmed/16758187)

If you have further comments to this episode, please share here!