👉 Eustacy is a type of congenital heart defect, also known as a ventricular septal defect (VSD). It occurs when the left side of the heart does not close properly and allows fluid to leak out through the left atrium. This causes pressure to build up in the right ventricle, leading to a condition called mitral regurgitation. Eustacy can be caused by various factors such as genetic disorders or environmental factors that affect blood flow between the heart chambers.
