Chest pain in pregnancy is defined as chest pain with clinical manifestations of precordial pain or angina during pregnancy. It is caused by gestational myocardial infarction. Gestational myocardial infarction is a rare complication of pregnancy. It is rarely reported in China. This kind of myocardial infarction is different from other kinds of myocardial infarction because it not only jeopardizes the life of the pregnant woman, but also threatens the fetus. What are the examination methods of myocardial infarction in pregnancy? 1.Electrocardiogram (ECG) The heart is excited by the pacing point, atrium and ventricle successively in each cardiac cycle, accompanied by bioelectrical changes, and the graphs of potential changes in various forms are called electrocardiograms (abbreviated as ECG) which are induced from the surface of the body through electrocardiographic tracers. The ECG is an objective indicator of the process of onset, propagation, and recovery of cardiac excitation. ECG is an important means to help determine whether the electrical activity of the heart is normal or not, and it is the earliest, most commonly used and most basic diagnostic method in the diagnosis of coronary heart disease. Chest radiograph Chest radiograph, also known as chest radiography. The X-ray image obtained by radiography is much clearer than that of fluoroscopy, and its advantages include: the image of the examined part is permanently retained on the film, which can be used for analysis, discussion and review and control; it can be used as a scientific research material for preservation; and radiography can show the microstructure, such as the early source of the disease of more than 2mm, which is clearer than that of fluoroscopy. Film can check the thicker parts of the human body, and make the patient receive less X-ray. 3, dynamic electrocardiogram dynamic electrocardiogram: is a long time continuous recording and compilation analysis of the heart in the activity and quiet state of the electrocardiogram changes. Also known as Holter monitoring. Dynamic electrocardiogram (DCG) can record all the abnormal waves, can detect all kinds of arrhythmia and patients in various states within 24h with or without symptoms of myocardial ischemia, for a variety of heart disease diagnosis to provide a precise and reliable basis. In clinical application, especially for early coronary heart disease has a high detection rate. Myocardial scintigraphy and some modern auxiliary diagnostic tests are helpful in the diagnosis of myocardial infarction in pregnancy. Myocardial infarction in pregnancy, due to the number and location of infarcted myocardial injuries, can be found in the clinically observed symptoms and physical examination of many symptoms and signs that may be similar to those in normal pregnancy, and need to be differentiated.