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Figure 2 (A) Effects of sinus node artery perfusion with 1 to 2, 10, and 100 µmol/l (µmol/l) catecholamines at a flow rate of 1.2 ml/min for 3 min (left) and 9 ml/min for 1 min (right) on heart rate. "n" indicates the number of perfusions. All curves differ substantially from baseline. p < 0.05 for all individual comparisons. (B) Percentage of perfusions that induced at least one atrial tachyarrhythmia. *p < 0.05 vs. Tyrode's solution. **p < 0.05 vs. 1.2 ml/min.