What is the cause of a newborn heart murmur?

A heart murmur in a newborn may be a normal physiological phenomenon, or it may indicate the presence of heart disease. Further examination is needed to determine the cause. A heart murmur in a newborn may be a normal physiological phenomenon, or it may indicate the presence of heart disease. The following are some possible causes: 1. Physiological factors: development of circulatory structure during fetal period: During fetal life, the circulation of the heart is different from that after birth. Special structures and channels gradually close after birth. During this process, murmurs may occur, but they usually disappear over time. Heart valves are not fully mature: newborn heart valves may not be fully mature, and the valves may not open and close tightly enough, resulting in murmurs. 2. Disease factors: cardiac structural abnormalities: such as atrial septal defect, ventricular septal defect, patent ductus arteriosus, etc., these abnormalities will lead to blood shunt or reflux in the heart, resulting in murmurs. Heart infections: such as myocarditis, endocarditis, etc., may lead to changes in cardiac structure and function, resulting in murmurs. Other diseases: Heart murmurs may also be caused by congenital heart disease, cardiomyopathy, or arrhythmia. It should be noted that heart murmurs do not necessarily mean heart disease, but they cannot be ignored. If a newborn has a heart murmur, doctors usually perform further tests, such as echocardiography, to determine the nature and cause of the murmur. If there is heart disease, the doctor will make appropriate treatment plan according to the specific situation. Parents should not be overly nervous about the situation of newborn heart murmur, but they should not be taken lightly. It is important to consult the doctor promptly and follow the doctor's advice for examination and treatment. At the same time, parents should also pay attention to the newborn's physical condition, such as shortness of breath, cyanosis, syncope and other abnormal conditions, should seek medical advice in a timely manner. In addition, for high-risk newborns, such as premature infants, newborns with a family history of congenital heart disease, doctors may pay closer attention to heart conditions and conduct early screening and intervention. In short, heart murmur in newborns may be normal or a manifestation of disease. Timely medical attention, detailed examination and evaluation can help detect and deal with potential heart problems early and ensure the health of newborns.