Hi @sistertwo. Noticed your concern about your husband's heart and wanted to give you something to work with in answer to your question. I have a personal interest as a person with hypertension and atrial fibrillation, but I guess my situation is not so uncertain that an Electrophysiology (EP) Study is necessary so far. I found a good basic article on the Mayo Clinic web site, and I thought you'd benefit from a little initial research: https://www.mayoclinic.org/tests-procedures/ep-study/about/pac-20384999. There is more on that web site if, when you are there, you search for "electrophysiology study." There also are some linked articles on the web site included here. How is your husband doing now (eight weeks after your earlier experience with his conditions)?