The most common clinical manifestations of digitalis poisoning are as follows: 1. Cardiotoxicity: mainly manifested by different types of arrhythmias. The type and severity of arrhythmias are related to the original disease of the heart. Toxic doses of cardiac glycosides mainly cause slow arrhythmias in healthy hearts, such as sinus bradycardia, atrioventricular block, and less frequently pre-term contractions or rapid arrhythmias. The most common is ventricular precontraction, the most serious is ventricular tachycardia, ventricular flutter and ventricular fibrillation. 2, mental and nervous system symptoms: mainly manifested as headache, insomnia, apprehension, vertigo, abnormal sense of direction, mental confusion, easily agitated, blurred vision, tiredness, weakness, sometimes can appear similar to the performance of trigeminal neuralgia. In severe cases, neurosis may occur. Some patients can appear “color vision”, feel the peripheral vision flash, yellow vision, green vision and other specific symptoms. 3, gastrointestinal reactions: this is the most common symptom of the early adverse reactions of cardiac glycosides, can cause nausea, vomiting, lack of appetite, anorexia, diarrhea, abdominal pain and other gastrointestinal reactions. 4, transient hyperkalemia: digitalis in the role of inhibiting Na + – K + – ATP enzyme, if poisoning The change is more obvious when it is poisoned, so digitalis poisoning can occur when the transient hyperkalemia.