@sistertwo I have all those tests done yearly at Mayo in Rochester; I’ll be there next week. The Holter Monitor is an ekg that you wear for 24 hours. During this time you cannot shower or get the leads wet in any way. They give you a little portable monitor attached to the leads that you will need to carry around. They put it in a little pouch that you can carry either around your neck or shoulder. Then you just go about all your daily activities as usual. In 24 hours you take the leads off and return the monitor for evaluation. They do give you a small journal asking that you take notes on your activities and any symptoms you may feel. You turn that in with the monitor.
I have pretty sensitive skin and always develop an itchy red rash from the heart monitor patches so I always bring along hydrocortisone cream for that after the patches are removed.
Hopefully this is helpful to you. Feel free to ask any further questions. Best wishes for good results.