Chest pain during pregnancy is defined as chest pain that occurs during pregnancy. Most of the chest pains that occur during pregnancy have anterior cardiac pain or angina pectoris as the clinical manifestation. It is caused by gestational myocardial infarction. Myocardial infarction of pregnancy is a rare complication of pregnancy. It is rarely reported in China. This type of myocardial infarction is different from other types of myocardial infarction because it not only endangers the life of the pregnant woman, but also poses a threat to the fetus. The clinical manifestations of myocardial infarction in pregnancy are very important for the diagnosis and reference. What are the symptoms that can be easily confused with chest pain in pregnancy? 1. Differentiation from chest pain or angina pectoris during pregnancy When persistent and gradually worsening chest pain occurs during pregnancy, it is accompanied by sweating, tightness in the chest and heartburn, and the possibility of myocardial infarction should be highly suspected if it cannot be relieved by treatment. If chest pain occurs during pregnancy, we should exclude gastrointestinal pathologies, such as heartburn caused by hyperacidity and pyloric spasm, as well as diaphragmatic hernia caused by increased abdominal pressure in late pregnancy, which leads to episodes of chest pain. Of course, it is also necessary to differentiate from X syndrome, variant angina pectoris, cardiovascular spasm syndrome causing episodic chest pain. 2. Differentiation with certain clinical symptoms and signs in pregnancy When pregnant women in pregnancy develop jugular vein angina, sweating, pale face, wet and cold limbs, or other symptoms such as bradycardia, hypotension, arrhythmia, especially patients with chest pain, they should think of the possibility of this disease. At this time, it needs to be differentiated from heart failure and other comorbidities caused by certain heart diseases. 3. ECG differentiation of myocardial infarction in pregnancy is the most convenient and easy way to diagnose myocardial infarction in pregnancy. However, when reading and evaluating the ECG, attention should be paid to the physiological Q wave and T wave inversions in normal pregnancy due to diaphragmatic elevation and change in heart position, which may occur in QIII and T wave inversions, which are more common in late pregnancy. QIII accounts for about 5% of normal pregnant women and TV4 inversions account for about 8%, which are not caused by myocardial lesions. In China, Zhang Guofen reported that deeper QIII, inverted TV3 and leftward shift of the electrical axis can occur in pregnancy. In addition, pregnancy predisposes to functional arrhythmias, mainly anterior contractions and supraventricular paroxysmal tachycardia, which should be differentiated in the diagnosis. The ECG changes in myocardial infarction in pregnancy are a series of QRS-ST-T evolution, so they should be clinically differentiated from the ECG changes in normal pregnancy. 4. Diagnosis and differentiation of serum enzymatic changes in myocardial infarction in pregnancy Serum enzymatic diagnosis of myocardial infarction in pregnancy should pay attention to the following points. (1) Elevated G0T activity during pregnancy and puerperium can help in the diagnosis of myocardial infarction. However, this enzyme activity is also increased in gestational toxicities, indicating that it is useful in the differential diagnosis of pre-eclampsia with hypertension or early nephropathy, as the latter two are not combined in pregnancy. (2) Increased CK-MB activity has a sensitive diagnostic value. However, during delivery, the elevated level of CK-MB activity varies depending on the mode of delivery, with higher CK-MB activity in cesarean delivery compared to vaginal delivery. (3) Tests for other enzymes can also help in the diagnosis of myocardial infarction. The clinical manifestations of myocardial infarction in pregnancy are of great reference and diagnostic value for diagnosis. Myocardial infarction in pregnancy has the following main clinical manifestations.