Assertion: atrial fibrillation's heart rate | /r/CapableOf | exercise intolerance
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Source sentences:
text: Rapid and irregular heart rates may be perceived as the sensation of the heart beating too fast, irregularly, or skipping beats (palpitations) or exercise intolerance and occasionally may produce anginal chest pain (if the high heart rate causes the heart's demand for oxygen to increase beyond the supply of available oxygen (ischemia)).