Thanks for the post.
Q:" ... I believe you suggested an alternative medication - what was it and how does it differ from metoprolol?"
Some of the medications that may be helpful (without any proof to demonstrate effectiveness) would be acebutolol or hyoscamine. Acebutolol is a beta-blocker with instrinsic sympathomimetic activity, so it tends to not slow the heart rate as much. Hyoscamine is a vagolytic, and is often used to treat nasuea. The drug has some side effects, however, like dry mouth and constipation.
A small minoroty of persons have what some refer to as "vagally-induced afib". Some well-respected EPs don't think that it is a real condition (I am not in this camp). The most likely story is that an extremely small minority of persons have pure vagally-induced afib, and a much larger minority have exacerbation of their afib due to vagal input.
Talk to your doctor about these meds before considering them further.
Hope that helps.
I was on the long acting version, Toprol XL, for about 6 months and it caused me nothing but trouble. Regular version is Lopressor...possibly other brand names I'm not aware of.
Toprol caused me intense gastric distress (severe bloating) and took 3 to 4 hours to cope with my tach episodes. One of the worst meds I ever took.
Somewhere in this forum, one of the good doctors made reference to adequate hydration and beta blockers in connection with certain kinds of irregular heartbeats. Can't locate it just now, but I vaguely recall that a connection is possible. Maybe the Doc will cover that in his reply to you.
Take care and Good Luck.