The causes of premature atrial contraction are many and can be broadly summarized as the following six points: 1, organic heart disease, such as coronary heart disease, wind heart disease, pulmonary heart disease, myocarditis, cardiomyopathy, heart failure, acute infarction, mitral valve prolapse, etc.; 2, endocrine diseases, such as hyperthyroidism, adrenal diseases; 3, various drugs, such as digitalis, quinidine, epinephrine, the application of various anesthetics, etc.; 4, acid-base imbalance, electrolyte disorders, such as low 5, sympathetic or vagal hyperactivity can also be caused, as well as with tension, excitement, sudden rise in blood pressure, fatigue, insomnia, sudden change in position, etc.; 6, direct mechanical stimulation, such as cardiac surgery or cardiac catheterization, etc. The mechanism of the disease is most common with abnormal increase in atrial autoregulation, which can occur in both normal and patients, and is more common in middle-aged and elderly people in normal people. Premature atrial beats occur in patients with organic heart disease and are often a precursor to tachyarrhythmias.