What atrial dysrhythmia has lowercase "f" waves, chaotic atrial electrical activity, and irregular R-R intervals?

Question

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Atrial fibrillation is characterized by chaotic atrial electrical activity, irregular R-R intervals, and lowercase "f" waves. Atrial flutter has regular R-R intervals and distinct "sawtooth" pattern on ECG. Wandering atrial pacemaker and multifocal atrial tachycardia both have multiple P wave morphologies on ECG, but they have regular R-R intervals.

What Atrial Dysrhythmia Has Lowercase "F" Waves, Chaotic Atrial Electrical