I have it too. Mine is tachychardia with occasional missed beats. My ecg looks like I've had a heart attack but it is due to a traumatic injury to my heart muscle (ragdolled 1000 feet, went over a cliff, and broke all the bones in the left side of my body, lacerating my heart). I noticed it during a particularly stressful work period and went to a cardiologist. He gave me two nuclear stress tests at age 47 in which I ran the inclined treadmill for 30 minutes at 209 with bp no higher than 130/90. Finally he just shook his head and said I was abnormal but my condition is not dangerous. So I avoided the beta blockers. Mine is brought on by a number of factors. A full stomach puts pressure on my vegas nerve and that affects my heart rate. Zinc supplements cause it to go through the roof, so I don't take them. Alcohol does it as well. Caffeine seems to be ok.
I boiled my thermometer, and sure enough, this spot, which purported to be two thousand feet higher than the locality of the hotel, turned out to be nine thousand feet LOWER. Thus the fact was clearly demonstrated that, ABOVE A CERTAIN POINT, THE HIGHER A POINT SEEMS TO BE, THE LOWER IT ACTUALLY IS. Our ascent itself was a great achievement, but this contribution to science was an inconceivably greater matter.
--MT--
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