Does anyone use a symptoms sheet or flow chart so multiple caregivers (family) stay in the loop?

There's a free website called Caring Bridge (caringbridgedotorg) that enables you to email multiple family members and keep everyone up-to-date. I'm not sure what all of the features of the website include, but you might start there.

I used CaringBridge to keep interested parties updated on my husband's dementia. My niece is using it right now to keep family and friends updated on her husband's recovery from an accident. It is free, easy to use, and a great way to communicate to lots of people at once.

If you mean caregivers coming into the house to help, keeping everyone in the loop is a good idea. I only had one PCA and we both made notes in a spiral notebook. It was good to have this record so I could look back and say, "Oh, this has happened 3 times in the last week." Notes would be things like didn't want breakfast, more confused than usual today, slept 3 hours in afternoon, etc.

Every hospital ward, rehab centre, care home and home care agency I've come across uses either white boards or communication books.

Well, I say "uses." These things are made available. In reality, day to day, almost nobody uses them. I've sometimes been tempted to put in ghost writing "Is There Anybody There..?" - just to see if anyone notices.

Gosh I wish I had known about CaringBridge for family use. It sounds perfect.

When Dad was still in his home, I kept a spreadsheet that showed all meds, dosages and times, in a report cover on the fridge door. That way if I got sick or just couldn't make it over for some reason, someone else could fill his weekly pill box. To keep things straight when he lived with me, I put everything into my smart phone and set reminders.