At one point, my wife had a resting heart rate of ~120. She always felt tired, and even light exercise would drive it up to 180-200. She went to doctors, and they all said nothing was wrong, she was just not in good cardiovascular shape, etc. (She was 5'7, 110 lbs, very little fat).
Finally, they discovered that she had an electrical anomaly (sort of a "loop") in her heart that would cause it to beat twice for each time it received a "beat" signal. She had a cardiac ablation via a heart catheter, her heart rate dropped to half of what it had been, and many of her health problems immediately began to disappear.
Maybe relevant, maybe not.
Cut the tiny testicles off of both of these rich, out-of-touch sumbiches, crush kill and destroy the Electoral College, wipe clean from the Earth the stain of our corrupt politicians, and elect me as the new president. --Vash