What is the expected O2 saturation change in the right ventricle during a ventricular septal rupture?

In the case of a ventricular septal rupture (VSR), there is a defect in the septum that separates the left and right ventricles. This allows blood to flow from the left ventricle, where the oxygenated blood is under higher pressure, into the right ventricle, which normally contains deoxygenated blood. As a result of this left-to-right shunt, the right ventricle receives a mixture of oxygenated and deoxygenated blood, leading to an increase in oxygen saturation levels within the right ventricle.

Normally, the oxygen saturation in the right ventricle is lower than that in the left ventricle because it receives blood from the systemic circulation, which is oxygen-poor. When a VSR occurs, the introduction of oxygen-rich blood increases the overall saturation in the right ventricle. Therefore, the expected change in oxygen saturation during a ventricular septal rupture is indeed an increased saturation.