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Platypnea-Orthodeoxia 

Platypnea-Orthodeoxia
Chapter:
Platypnea-Orthodeoxia
Author(s):

Edward C. Rosenow

DOI:
10.1093/med/9780199756926.003.0021
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date: 22 April 2021

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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