A rare complication of pneumonectomy: diagnosis made by a literature search.

This case describes platypnoea-orthodeoxia syndrome in a patient 2 months after a right pneumonectomy for adenocarcinoma of the lung. The patient complained of platypnoea (breathlessness in the upright position) and was noted to have orthodeoxia (arterial desaturation on standing) on clinical examination. This was due to anatomical changes after the pneumonectomy that resulted in direct blood flow from the inferior vena cava through a previously unrecognised atrial septal defect into the left atrium. The closure of this right to left shunt with an Amplatzer occluder produced immediate and striking symptomatic relief in the patient. The authors had no previous experience of this very rare complication of pneumonectomy. The diagnosis was made after a literature search using PubMed/Medline, underlining the direct clinical benefit provided by these databases.