they seem to change the icp bolts if they have been in for longer than a week because they found the reading/trace becomes unreliable/inaccurate. however we seldom have to do this as it is rare for...
Our practice is much the same as RoxanRN2003. We also zero ICP transducers as well as A lines and CVPs at the beginning of each shift. The bolts occassionally get inserted by the Registrar...