has participant quality atrial fibrillation AE WEB: http://medical-dictionary.thefreedictionary.com/atrial+fibrillation NCIt: C50466 AF MedDRA: 10003658 SS, YH MedDRA ID: 10003658 Atrial fibrillation (AF or A-fib) is the most common cardiac arrhythmia (abnormal heart rhythm), and involves the two upper chambers (atria) of the heart. Its name comes from the fibrillating (i.e., quivering) of the heart muscles of the atria, instead of a coordinated contraction. 房颤 WEB: http://en.wikipedia.org/wiki/Atrial_fibrillation HPO: HP_0005110 SIDER: C0004238 an arrhythmia AE that involves the two upper chambers (atria) of the heart CTCAE: E10081 arrhythmia AE AE severity G1 AE severity G2 AE severity G3 AE severity G4 AE severity G5