Learning points
The patient had dyspnea on exertion from 8 months ago, however, during many visits; no one carefully auscultated the heart. Even after COVID-19 infection she did not undergo echocardiography to evaluate the other causes of dyspnea.
After successful RSVA closure, the symptoms of the patient were carefully noticed and POS was diagnosed by basic physical examinations. This syndrome is one of the indications of PFO closure[10].