The heart is an organ of the circulatory system that has the most important role in the human body, helping to pump oxygen and nutrient-rich blood throughout the body to maintain life. In the human body, the heart contracts continuously up to 100,000 times per day and pumps 5-6 liters of blood per minute. Therefore, the assessment of cardiac indicators helps doctors find abnormal diseases of the circulatory system or related structures for timely diagnosis and treatment.