Oxygen step up in right atrium – MCQ – Answer

Oxygen step up in right atrium – MCQ – Answer

Step up in oxygen saturation on cardiac catheterization in the right atrium is suggestive of – Correct answer: a) Atrial septal defect

In ventricular septal defect oxygen step up is seen at ventricular level. For example, if the oxygen saturation is 64% in the right atrium, it becomes 82% in the right ventricle due to entry of oxygenated blood from the left ventricle across the ventricular septal defect. In patent ductus arteriosus, oxygen step up is noted at the level of the pulmonary artery.

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