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Edward C. Rosenow

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date: 16 May 2022

Platypnea: dyspnea in upright position

Orthodeoxia: hypoxemia in upright position

Both conditions occur with normal right heart pressures

Right pneumonectomy is most common predisposing factor

Pulmonary embolus is next most common predisposing factor

Theory: after right pneumonectomy, gradual rotation of heart toward the horizontal position and torsion when patient is in the upright position open a patent foramen ovale (PFO). Blood flow from the inferior vena cava goes directly to and through the PFO...

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