
Either it leads to oxygenated blood going back to the lungs along with unoxygenated blood (what I have I think) or it leads to unoxygenated blood being pumped throughout the body along with oxygenated blood. The latter is much worse, though the former can also cause complications. There’s also a third type called a circular shunt that’s life-threatening since it causes some blood to stay in the heart and not go out to the rest of the body, but that one’s super uncommon