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Figure 3 (A) Effective refractory period (ERP) measured in the right atrium during sinus rhythm (SR) and at various cycle lengths in the control, aorto-pulmonary artery shunt (APS), and aorto-pulmonary artery shunt reversion (APSR) states in six G3 animals. (B) Example of repetitive atrial firing and of (C) a sustained episode of atrial fibrillation triggered by a single extra beat in the APS state. A1 (paced) and A2 (premature) atrial electrograms. RAA1 and RAA2 = right atrial electrograms recorded with the quadripolar electrode.