In the sixth month of pregnancy, dyspnea occurs, which needs to be observed for its severity. In the middle and late stages of pregnancy, the blood circulation increases, and the effective blood volume required for circulation increases due to the increase of the fetus, which leads to myocardial ischemia and hypoxia and can lead to dyspnea, which requires oxygen to improve the dyspnea caused by the lack of oxygen in the body. However, in some people, myocardial ischemia and hypoxia can lead to heart disease, and an electrocardiogram is needed in time. If it affects the normal function of the heart muscle, it also needs to be treated, regulated and improved with medication in time. During this period, if the myocardial ischemia is more serious, it will easily lead to brain hypoxia, or fetal ischemia and hypoxia in the uterus, affecting the healthy development of the fetus, and in serious cases, it can also lead to intrauterine distress of the fetus.