It doesn't have to be a long note, something short and to the point works.
Medicine IS a team sport, and I'm thankful for that every day. No way in hell I could survive inpatient medicine without great nurses. Usually, if a nurse raises a concern, I give them some sort of plan, that either ends with a medication or parameters for him/her to monitor and assess, or what parameters would need a call back. If they lead the question with "Do you mind taking a look at him?", that triggers to me that they are concerned about potentially crashing, so I usually take the time to head at bedside to at least ease the fear or confirm the suspicion they have. Of course, it can't always be immediate, but if they request a physician at bedside, letting them know an estimate helps.
IMO, rapids are helpful if nursing staff needs someone to make a decision ASAP but the doctor is off-site or busy in a procedure or in the midst of another crashing patient, but can be abused if used incorrectly.