Assertion: atrial fibrillation's heart rate | /r/CapableOf | exacerbate underlying heart condition
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Source sentences:
text: Some people who have atrial fibrillation have significant problems with their heart and with exercise, the heart rate can race tremendously during atrial fibrillation, thereby exacerbating the underlying heart condition and may lead to problems such as very low blood pressure, heart failure or a loss of consciousness.