The most common manifestation of digitalis toxicity is premature heart beats, especially solid premature beats, which can be monogenic or multi-source ventricular premature beats, and in severe cases, frequent ventricular premature beats with duplex and triplex rhythms. In addition, if digitalis toxicity is not corrected in time, atrial flutter, atrial fibrillation, supraventricular tachycardia, non-paroxysmal junctional tachycardia and bidirectional tachycardia may occur, and conduction block may occur in the most severe cases, with atrioventricular block being the most common, and changes may be incomplete atrioventricular block.