Apelin is an endogenous ligand associated with angiotensin Ⅱ type 1 receptor protein in cardiomyocytes,vascular smooth muscle cells and endothelial cells. It is involved in the occurrence and development of hypertension,coronary heart disease, heart failure, atrial fibrillation and other cardiovascular diseases. Electrical activity of cardiomy-ocytes is the foundation to myocardial function. Apelin increases the excitability and conduction to modulates cardiac function through Na+, K+and Ca2+channel. This p...