In their recently published article, Krishnamoorthy and coworkers describe a case of an asymptomatic hypoxia due to atrial septal defect in a pregnant woman. However, before accepting their conclusion, some issues require further clarification: (a) What were the patient's haemodynamic findings in cath-angio before the closure of ASD? (b) What was the final arterial saturation after device closure of the ASD?