That's a little better information about what you want to know. I work on the east coast in a mixed medical/surgical ICU.
We have respiratory therapists who manage ventilators/respiratory treatments for the patient. However we (RN's) are ultimately responsible. Some ICU's also have techs or aides that help, such as getting blood products/equipment, delivering specimens to lab, re-positioning, toileting, etc.
I work primarily at night, so this is what my work flow is like.
I arrive about 15 minutes prior to the start of my shift, figure out what patient's are assigned to me and analyze their strips, see what they were trending like during the day and grab some flowsheets. I then take comprehensive report from the day nurse, once complete we go over to the bedside and conduct a quick bedside report where we greet the patient and go over their drips (make sure they are correct, confirm IV pump settings, etc), we also will look at pertinent issues together; for example if the patient is there for a craniotomy we will do a neuro exam together, if it was a whipple we will look at the dressings and drains together. Once this is done, I go over to the computer and review their latest labs, xrays, see if they have any medications due, etc. Once this is done I go in and do my head to toe assessments (at this point its approx 1930-1945) I will change central line dressings/a line dressings at this time if they are gnarly as well as other dressings. At around 2100-2130 I start giving meds, at 00:00 I will change IV tubing that is due to be changed, at 0200 I will draw labs, at 0400 replace electrolytes and such and bathe intubated patients, last med pass at 0600, get them ready for CXR/CT Scan, and at 0700 give report.
Sprinkled in between obviously there are re-positioning and glucose checks. The residents do a night time round at around 2100, but it is just 2 of them and not the whole team so it is very informal. We use an electrolyte replacement protocol, which works rather nicely. This is a pretty much straight forward night.