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Figure 1 A 12-lead electrocardiogram showing P-wave morphology during atrial tachycardia in a patient with adenosine-induced atrioventricular block. The P waves are inverted in II, III, and avF. The precordial leads show positive P-wave in V1, inverted in V6, with a transition at V4. Lead avL shows an initial positive component followed by a negative component.
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