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Schematic drawing showing various hypotheses and proposals concerning the mechanisms of atrial fibrillation. a Multiple wavelets hypothesis. b Rapidly discharging automatic foci. c Single reentrant circuit with fibrillatory conduction. d Functional reentry resulting from rotors or spiral waves. e AF maintenance resulting from dissociation between epicardial and endocardial layers, with mutual interaction producing multiplying activity that maintains the arrhythmia
