Reflux occurs when the heart valves (including the mitral valve, tricuspid valve, aortic valve, and pulmonary valve) do not close properly, causing some blood to flow back out of the heart when blood is ejected because the heart valves do not close properly.
Under normal circumstances, the heart does not experience backflow of blood because the heart valves, like doors, can open and close normally and completely, preventing backflow of blood. If the mitral valve is not closed properly, some of the blood from the left ventricle will flow back into the left atrium; if the tricuspid valve is not closed properly, some of the blood from the right ventricle will flow back into the right atrium; and not only that, but also the aortic and pulmonary valves can cause the heart to regurgitate if they do. The degree of regurgitation can be determined by ultrasound of the heart.
Once heart blood reflux occurs, it is necessary to go to a regular medical institution for further detailed examination to clarify the cause and then carry out standardized treatment.