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These findings supported the further exploration of Gentianae Radix et Rhizoma as effective phytotherapy to prevent and treat ALD. The electrophysiology algorithm for localizing left or right origins of outflow tract ventricular arrhythmias (OT-VAs) with lead V transition still needs further investigation in clinical practice. Lead I R-wave amplitude is effective in distinguishing the left or right origin of OT-VAs with lead V transition. We measured lead I R-wave amplitude in 82 OT-VA patients with lead V transition and a positive compl