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Atrial Fibrillation
Cardiovascular System • Atrial fibrillation is the most common sustained cardiac arrhythmia, characterized by disorganized atrial activity, irregularly irregular rhythm, and increased stroke risk.
Atrial Flutter
Cardiovascular System • Atrial flutter is a reentrant supraventricular tachycardia with regular atrial activity at 250–350 bpm, typically with 2:1 or 4:1 AV block.