I share in the frustrations of having an art line that won't pull back and won't transduce a good arterial wave form/pressure. It is hospital policy where I work that all arterial lines must be transduced on the monitor regardless of how well they work. This is a hassle sometimes because a patient may have three arterial lines (one radial for BP and blood draw, one IABP arterial line in the L fem, and maybe one arterial sheath from the cath lab in the R fem). This can make it frustrating have to deal with the alarms of 3 art lines. Getting back to your original point, yes I think it is bad to have taken the arterial line off the monitor. In any case, an arterial line that isn't working should be removed in my opinion.