At my hospital we can run 3 rooms at a time. This can mean different things: 2 hearts and a tavr room. 2 hearts and a robot room Or 3 heart rooms. We have 1 circulator, 1 main scrub (CST or rn scrub) and a 2nd scrub as we call it. Also there is a PA. Tavrs have 1 scrub and 1 RN, and lungs/robots only need 1 and 1 also. Nurses average 8 days on call. 1st scrubs average 15 days on call and the 2nd scrubs average 6-8. So the skill mix isn't equal among those that are the 1st scrub hence the increased call. We have done this forever and that main scrubs are tired of all the call. Would you make the others learn and take 1st scrub call? Docs want either 1 of 2 scrubs to stay home on call or have just 1 scrub and 1 circulator for cases. We also work 8 hr shifts and typically work 10+ hrs. So for that reason they want to move to 10 hr shifts.