There was machinery-like murmur of the heart and doctors said that connection between aorta pulmonary artery is still openWhat structure this?

The structure that is most likely causing the machinery-like murmur of the heart and the persistent connection between the aorta and pulmonary artery is a patent ductus arteriosus (PDA).

The ductus arteriosus is a small blood vessel that connects the aorta (the main artery carrying oxygenated blood from the heart to the body) and the pulmonary artery (the artery carrying deoxygenated blood from the heart to the lungs). It is normally present in fetuses and plays a crucial role in fetal circulation, allowing oxygenated blood from the placenta to bypass the lungs.

After birth, the ductus arteriosus usually closes naturally within the first few days or weeks of life. However, in some cases, the ductus arteriosus remains open, leading to a condition known as a patent ductus arteriosus (PDA). A PDA can cause a characteristic machinery-like heart murmur, as the blood flows back and forth between the aorta and pulmonary artery. It can also lead to increased pulmonary blood flow, which can put extra strain on the heart and lungs.

Treatment for a PDA typically involves surgical or interventional closure to prevent potential complications.