Conduction block generally refers to cardiac nerve conduction block, which is caused by nerve conduction dysfunction due to certain reasons, most commonly caused by heart disease, electrolyte balance disorders, drug factors and other reasons. 1. Heart disease: for example, acute rheumatic myocarditis, cardiomyopathy, heart valve disease, etc. will affect the cardiac nerve conduction function and lead to nerve conduction block. 2. Electrolyte balance disorders: for example, changes in blood potassium and calcium levels can affect the heart’s conduction function, which may cause atrioventricular block. 3. Drug factors: e.g. blind use of potassium chloride injection, betalactam, etc. Atrioventricular block can cause arrhythmia, and patients may experience a variety of symptoms such as weakness, dizziness and palpitations (rapid heartbeat, often accompanied by panic). If heart nerve conduction block occurs, do not use medication by yourself, you need to clarify the cause of the disease with the help of a doctor, and carry out targeted treatment or therapy.