CARDIAC PLATYPNEA-ORTHODEOXIA SYNDROME: A RARE CAUSE OF HYPOXEMIA

Platypnea-Orthodeoxia Syndrome (POS) is a relatively rare condition, characterized by dyspnea that is exacerbated in the upright position due to transient arterial desaturation caused by the shunting of blood, usually through a patent foramen ovale (PFO), from the right to the left atrium. Symptoms