Being able to run 2 kilometers usually does not indicate the absence of heart problems, such as coronary stable angina, atrial septal defect, small ventricular septal defect, and arterial ductus arteriosus.
Usually, people with stable angina pectoris, early atrial septal defects, small ventricular septal defects, mild arterial ductus arteriosus, mild pulmonary artery stenosis, and patent foramen ovale, etc., in the early or stable stage of the disease, do not have obvious symptoms, and will not lead to the symptoms of cardiac insufficiency, so you can usually run for about 2 kilometers.
Secondly, the above diseases may cause ischemia, hypoxia, or organic changes in cardiomyocytes when they are in advanced stages or acute episodes, resulting in discomfort such as chest tightness, chest pain, and exertional dyspnea, and therefore, it is usually not possible to run for 2 kilometers.
If you experience cardiac symptoms after running 2 kilometers, such as chest tightness, chest pain, dyspnea, etc., it is recommended to go to the hospital in time, under the guidance of the doctor to improve the electrocardiogram, dynamic cardiogram, cardiac ultrasound and other tests to clarify the diagnosis, and then early standardized treatment.