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Right to left shunt 20 years after sinus venous atrial septal defect closure
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A 29 year old woman with hypoxia of unknown aetiology, which was found one day after she underwent a knee joint operation, was admitted to our hospital. She had undergone an atrial septal defect (ASD) closure 20 years previously. Arterial Po2 (Pao2) was 74 mm Hg despite administration of 10 ml/min of oxygen (Pao2 was 58 mm Hg in room air). She had no symptoms and was not cyanotic. Chest x ray was normal and there were no ECG abnormalities. …