Firstly, let me state that a one off result is not significantly relevant and so please don’t draw any definitive conclusions from my personal experience.
To compound the above, my circumstances are not straight forward and there are lots of variables that could impact instances of me either having or not having an episode of AF.
So, some background: I previously had A Flutter, probably as a result of a period of endurance training and an underlying propensity as both my parents had AF. This was resolved after a 2nd ablation 2 yrs ago. Then came AF which recently has been almost exclusively triggered during running, if I let my HR get over 140. My EP believes it is emanating from the pulmonary vein and he is confident he can zap it with another ablation (or 2 if stubborn). I take 50 mg Flecainide BiD (twice daily) but after consultation with my EP, dropped the Beta Blockers recommended with it as they made running absolutely missable and soul destroying.
So over the last few weeks, I’ve had AF each Sat morning part way (30 to 40 mins in) on my long run with the club - it’s so hard to run slower than your natural pace and a slight hill is enough to make my HR spike. Normal routine is to stop running (I’m pretty asymptomatic and only know I’m in AF as my Garmin shows my HR has spiked to 215), walk home, take 2 x 50 mg Flec PIP and await NSR - normally with 5-6 hrs. Once it did revert on the walk home, only to come back of it’s own accord later that day. So, to some extent it’s largely predictable.
This morning (Sat), usual run but with a slower group and slower pace (ave HR 126, max 140) 8 miles no AF. An hour after, and skipping breakfast, had Covid + Flu jab, went home and then had breakfast, including 50:50 decaf / full caf coffee ( I just can’t do the full decaf - no flavour). Added complication, with the change in routine, I inadvertently forgot to take my morning 50mg Flec
It gets to 5:00pm and I realise I’m in AF. I’m generally asymptomatic and have no idea when it started. 100mg of Flec and 3 hrs later I’m back in NSR.
So, read into that what you will. Unfortunately so many variables that there’s no clear cause / effect. I’ve had 3 Covid jabs before and none of them resulted in unusual AF episodes. Was this episode as a result of mornings run / not taking my morning Flecainide / the sneaky coffee or even the Covid jab / Flu jab or maybe the cumulative effect of many / some smaller contributors? Would I have avoided an episode if I had not had the jab? I’m certainly none the wiser and have not been put off future jabs. Though maybe next time I’ll try to reduce the variables and see what happens….