During my AFib episodes, my heart rate is so wildly erratic, that it’s hard to take a count. At times felt like 300 BPM, but my wife, a retired RN, took it a couple of times at about 120 BPM. It’s the galloping irregularity that is so unsettling rather than the pace of the pulse for me. It is actually the CHADS2 scoring that prompted my doc to recommend no blood thinner. My score was a 1/2 with the only condition in favor of the med my age. Speaking of confusion, though, I have heard a great variety of conditions that would be more and less likely to result in stroke. For example, I have heard on one hand that the first hiccup in an AFib attack can cause stroke while on the other hand you have to be in AFib for hours or even days before the stroke threat becomes meaningful. Lots of question marks about all this stuff, for sure. No, I can think of nothing that caused me to suddenly go into AFib so late in my life. ..thanks for the tip about sitting up quickly and taking something like gas-ex. I have always thought that my PVCs and tachycardia were often brought on by a gassy stomach…?