TY - JOUR T1 - Hypoxemia Secondary to Right-to-Left Interatrial Shunt Through a Patent Foramen Ovale in a Patient With an Elevated Right Hemidiaphragm JF - Respiratory Care SP - 462 LP - 465 VL - 53 IS - 4 AU - Linda A Perkins AU - Steven M Costa AU - Carl D Boethel AU - Mark E Lawrence Y1 - 2008/04/01 UR - http://rc.rcjournal.com/content/53/4/462.abstract N2 - Though uncommon, right-to-left shunt through a patent foramen ovale with normal right-side pressure and with a normal interatrial pressure gradient has been reported. The speculated pathophysiology is attributed to directional blood flow streaming from the vena cava to the left atrium. Hypoxemia secondary to right-to-left shunt with normal pulmonary artery pressure has been extensively documented after right pneumonectomy. Five prior cases have documented hypoxemia secondary to a right-to-left shunt through a patent foramen ovale in the presence of an elevated right hemidiaphragm. This is the sixth documented case of right-to-left shunt through a patent foramen ovale in the presence of an elevated right hemidiaphragm with a similar presentation in which closure of the patent foramen ovale resulted in resolution of hypoxemia. ER -