Everyone's response is different, and
I found that Lexapro and
Paxil increased my anxiety, and
thus were not appropriate for me.
Xanax, of course, is a fine medication that helps most people get over the hump while the SSRI builds up in the system.
When the heart is found through repeated testing to be healthy, and anxiety is thought to be a likely contributor to rhythm problems, I really believe that a good trial of one of the SSRIs is an excellent idea.