Cardiac units vary by facility in what acuity of patients they care for, what kind of monitoring and drips they do, and their staffing level. Some will pull sheaths, titrate multiple meds, etc.
In my hospital our unit was called a PCU, but the name has changed to CVU. We do not pull sheaths, and titrate Cardizem and Insulin gtts only. We will administer IV NTG, dopamine, dobutamine and milrinone with a set dose only. We take 4-5 patients with aides.
Our hospital just started a stepdown unit that is staffed 3:1. It is staffed with ICU RNs and takes mainly respiratory pts. needing cont. BiPAP and HF patients with Swans.
ICU is staffed 2:1, 1:1 or 1:2.