Abstract
A 64-year-old male reported worsening dyspnea four months after right-sided pneumonectomy, due to lung cancer. Platypneu-or-thodeoxie syndrome was suspected due to a decrease in oxygen-saturation while the patient was in upright position. The shift of the right hemidiaphragm and liver caused compression of the right atrium and a shunt over a persistent foramen ovale. The right-to-left shunt was proven during right heart catheter. Interventional closure of the shunt resulted in immediate improvement of arterial oxygenation and a decrease in dyspnea.
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