I’m very interested in replies to this because I had my first ever bout with a fib (except immediate post surgery) after my second Pfizer vaccine shot. After the first shot I got very sick with flu-like symptoms and had to go into the hospital two weeks after the second shot. I asked my dr and he said it was possible, but they don’t know because of not enough information or research.

I got afib after Moderna vaccine. Wish I had waited for the Norvasc vaccine which is the traditional type of vaccine.

Had a bear faitnt episode three hours later.

I got the Prizer double jab. Until then, total heart health! Low blood pressure. Physically fit and very active since I was an industrial grunt (blue collar worker) in automotive for over two decades.

Now? A-fib and the attendant blood clots.

If I'd known then what I know now.

Oh, just as serious, my strictly cutaneous mastocytosis has escalated to GI MCAS (mast cell activation syndrome).

I think it triggered it, I also think the vac pushes ederly into dementia or early dementia and death, but those are things we will never hear about or anyone will admit to. I have long covid even with vaccine and I can tell you not only did i get afib but have lung issues and memorable issues as well. I have always been able to remember numbers after looking at them one time. Now it takes me weeks to remember phone and credit card numbers.

Not sure what to think: About two months ago, Google implemented its Afib algorithm (Afib/irregular heart beat detection & tracking) for all premium FitBit users. I activated it.

On October 9th, I received the new Moderna bivalent COVID-19 booster (fifth dose of the Moderna COVID-19 vaccine: 2 originals; two WT boosters; new bivalent booster). I had no adverse reactions of any kind after the 4 preceding vaccinations.

On October 14th, the Friday following the bivalent booster dose, I experienced a very distressing/stressful incident (that really activated sympathetic nervous system). I note this because I really had a stressful meltdown that wiped me out physically & mentally.

I went to bed that night & awoke the next morning, October 15th, to a flurry of FitBIT Afib notifications. Firwst ever. One was recorded as early as 10:21 p.m. while the majority recorded events that occurred in the very early hours of the next morning.

Apart from being alarmed--& puzzled, by the Afib notifications, I felt fine.

Note: According to FitBit, which has been collecting health- & specifically heart-related health & fitness data (on me) since 2015, my cardio fitness ranks at the 99th percentile (within my age group; I am 64). I do extreme fitness workouts (Insanity, TapOut XT, P90X, P90X2, P90X3) 4-5 times each week, I average about 12,000 steps per day (even though I am an office worker). My BMI is 18. My resting heart rate is 46. I have NO history of cardiovascular disease whatsoever. I take no medications.

So I was profoundly disturbed by the FitBit/Google AFib notificaitons. Btw: The Google/FitBit AFib algorithm is an FDA-approved medical device & a clinical trial confirmed its accuracy (corresponding to a medical-grade EKG) at 98%.

More information: I consume a plant-based diet that I supplement with Bulletproof Brain Octane, which is a an MCT-based (distilled & concentrated caprylic acid, C8) Keto supplement. I do this primarily for the brain-nutrient benefits. However, Keto supplementation, like a Keto diet, drives depletion of essential electrolytes, especially magnesium & potassium. I have not been supplementing with either magnesium or potassium (though I do take a multi-vitamin with both in small amounts, far, far below the minimum daily requirements) .

Well, we know how important both potassium & magnesium are to heart function.

My reading of some literature (both of a scientific & non-scientific variety) on Keto/Keto supplementation & the essential roles that magnesium & potassium play in electrocardio function lead me to wonder...whether the combination of the recent bivalent Moderna booster (creating the expected immunological activation & inflammation) & my three-times daily Bulletproof supplementation (I put it in a plant-based protein shake; once a day I make a shake with my blender that includes 6-7 cups of fresh baby spinach, which should provide me with a healthy dose of magnesium)...

...did not precipitate/cause these bouts of arrythmia (which the Google algorithm terms "irregular heart beats")?

Since October 15th, I have had two other series of FitBit 'Afib' notifications, recorded once again during my sleep...in the early morning hours.

Note: I have ordered high-quality magnesium taurate & potassium citrate supplements (& am anxiously awaiting their delivery).

Would very much appreciate reading other people thoughts & feedback.

Anticipatory thanks, Shoshin