関連ワード:  is atrial flutter an arrhythmia    is a flutter an arrhythmia    is atrial fibrillation an arrhythmia    is a fibrillation an arrhythmia    is atrial fibrillation an irregular heartbeat    is atrial flutter afib    is a flutter afib    is atrial fibrillation and arrhythmia the same    is atrial flutter and afib the same    what type of arrhythmia is atrial flutter