Atrial fibrillation is atrial fibrillation is uncoordinated beating of the atria rapid, uncoordinated ventricular contractions strong, rhythmic atrial contractions slow, strong ventricular contractions

I think the Atrial fibrillation is the uncoordinated beating of the atria rapid. These are rhythm in which all the atrial activity is depicted as chaotic undulations of the base line. Atrial rhythms include; atrial fibrillation, atrial flutter, premature atrial contraction, wandering pacemaker. Atrial fibrillation can cause an increased risk of stroke, heart failure and other heart related complications.