The clinical manifestations of cediran poisoning are as follows: 1. Cardiotoxicity: mainly manifested by different types of arrhythmia. Poisoned people may have arrhythmia, and the type and severity of arrhythmia caused by it are related to the original disease of heart. Poisonous amounts of cardiac glycosides mainly cause slow arrhythmias, such as sinus bradycardia and atrioventricular block, but less often pre-systole or tachyarrhythmia in the healthy heart. For serious organic heart disease, it is easy to cause tachyarrhythmia, the most common is ventricular pre-systole, the most serious is ventricular tachycardia, ventricular flutter and ventricular fibrillation. 2, mental and nervous system symptoms: the main manifestations of headache, insomnia, anxiety, dizziness, abnormal sense of direction, mental confusion, easy to excitement, blurred vision, lethargy, malaise, and other symptoms, sometimes similar to the trigeminal neuralgia manifestations, severe cases of neurologic confusion. In severe cases, neurological disorders may occur. Some patients may have “color vision”, feel the flash of peripheral vision, yellow vision, green vision and other specific symptoms.3, gastrointestinal reaction: this is the most common symptom in the early stage of cardiac glycosides adverse reactions, which can cause nausea, vomiting, lack of appetite, anorexia, diarrhea, abdominal pain and other gastrointestinal reactions.4, transient hyperkalemia: digitalis inhibits the Na+-K+-ATP enzyme when it plays a role, and its change is more obvious when it is poisoned. The change is more obvious when it is poisoned, so transient hyperkalemia can occur when digitalis is poisoned.