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Platypnea orthodeoxia syndrome etiology [1,27]. * Patent foramen ovale, atrial septal defect, atrial septal aneurysm with associated septal defect, partial anomalous pulmonary venous return, unroofed coronary sinus, and other possible mechanisms of shunting. Black arrows represent mechanisms of shunting in current case. Orange arrow represents other possible causes in COVID patients. Created using Microsoft Word, Washington, USA and macOs Big Sur operating system Version 11.4.
