患者，男，56岁。心悸、气促1天。脉搏135次/min,听诊心率160次/min,不规则，心音强弱不等。心电图:P波消失，代之以450次/min左右的f波，QRS波群时限0.11秒，R-R间期绝对不等。该例的诊断是

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