| http://www.w3.org/ns/prov#value | - In atrial fibrillation, the atria ???quiver??? chaotically and the ventricles beat irregularly, causing such symptoms as a fluttering feeling in the chest, a racing pulse, low energy, a faint or dizzy feeling, chest pressure or discomfort, shortness of breath and anxiety, and in Clark???s case, an unusual symptom of tunnel vision when her heart was out of rhythm.
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