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4. 1 and 3
Ventricular septal defects with a left to right shunt have a step up in the blood oxygen in the right ventricle which results from the mixing of the oxygenated left ventricular blood with the normally deoxygenated right ventricular blood. The results of the right heart catheterization are shown in Figure 4.
Figure 4. Right ventricular oxygen saturations and pressures.
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