Atrial Fibrillation (AFib) Support Group
Atrial fibrillation (AF or afib) is an abnormal heart rhythm (cardiac arrhythmia) which involves the two small, upper heart chambers (the atria). Heart beats in a normal heart begin after electricity generated in the atria by the sinoatrial node spread through the heart and cause contraction of the heart muscle and pumping of blood.

I forgot how I initially ran across the following piece, but it kind of resembles how my days go sometimes when I'm working. Needless to say, it makes one rather cautious.
http://web.mit.edu/2.75/resources/random/How%20Complex%20Systems%20Fail.pdf
My PCP said I should get a shot for future prevention. My dermatologist says it's not necessary?
Re: the flu shot. I have hip replacements. I had pain walking for some time after a flu shot 2 years ago. Maybe it was just a coincidence. Currently I skip the flu shot. Apparently this year it's not too effective anyway.
I've had no AF reaction for either shot.
For me at least, the risk of upsetting the apple cart and triggering afib seems much greater if I get sick with shingles or flu.
BTW...many people think the flu shot is for stomach flu type illneses. Influenza is a respiratory illness with a cough, body aches, and a fever. It can be really miserable, and sometimes deadly.
Shingles starts in the spine. A good Chiro can adjust you to be rid of them in days. For supplements, Lysine 2000mg and 6000mg of Vit C, and applying tea tree oil works great. Theres also many foods that provoke it. Peanuts #1, tomatoes, wheat and sugar are a few.
The vaccine. Shingles is related to herpes. The vaccine has a whopping .26%, yes, less than 1. success rate. In one study, 3.3% on placebos vs 1.7% with the shot, got shingles.
So why the push by the PCPs for a .26% success rate? Cost per shot $219.
Can't say it was a bad case and when I heard it was related to herpes treated it like the herpes virus. It had no affect on afib. Thought about shot and decided against, as the thought of live virus just not acceptable yo me.
Now if it was a bad case and close to the eyes I may mthink differently. It is the only shot I ever considered.