Palpitation is a common clinical symptom, which is a feeling of discomfort or palpitations of the heart. Normal healthy people only have palpitations when they are doing strenuous exercise, being excessively nervous or highly excited. However, if often appear palpitations, and accompanied by palpitations, shortness of breath, chest tightness symptoms, it may be a harbinger of some diseases, should be to the hospital to do a detailed examination.

　　Electrocardiogram (ecg) refers to the heart in each cardiac cycle, excited by pacemaker, atrium, ventricle, accompanied by ecg changes in bioelectricity, electrocardiograph from the body surface leads to a variety of forms of potential changes of the figure. Ecg can analyze and identify various arrhythmias. It can also reflect the extent and development process of myocardial damage, as well as the functional structure of atria and ventricles. However, electrocardiogram (ecg) is not an essential indicator of cardiac function, because sometimes, although the ecg is normal, the cardiac function may not be normal. Therefore, ecg examination must be combined with a variety of indicators and clinical data, comprehensive analysis, to make a correct judgment of the function and structure of the heart.

　　Cardiac color doppler ultrasound (cdus) is an examination method that generates hd and color images of the heart after computer calculation through the combined action of B ultrasound and doppler ultrasound. Cardiac color doppler ultrasound is the only instrument that can visually display valvular lesions.

　　Cardiomyopathy is a disease with increasing incidence in recent years.

　　For coronary heart disease, color doppler ultrasound can intuitively display the movement status and cardiac function of myocardium and suggest the site of myocardial ischemia to clinicians. In short, almost all heart diseases can be diagnosed by cardiac ultrasound.

　　Cardiomyase cardiomyase is the general name of various enzymes that exist in myocardium, including aspartate aminotransferase, lactate dehydrogenase and isoenzyme, alpha-hydroxybutyrate dehydrogenase and creatine kinase and isoenzyme. At present, this group of enzymes related to myocardial injury are often referred to as myocardial enzyme spectrum in China, which has certain value in the diagnosis of myocardial infarction.