Case reportPlatypnea-Orthodeoxia Diagnosed by Sitting Transesophageal Echocardiography
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Comment
The symptoms of POS disappear when the patient is recumbent; therefore, POS is difficult to recognize and is rarely diagnosed. The mechanism is thought to be a paradoxical interatrial shunt through a PFO with distortion of the atrial septum, triggered by postural change [1]. Because a PFO is a common cardiac condition found in nearly a quarter of the healthy population, POS might occur more frequently than recognized, although most cases may remain subclinical.
Aortic root dilatation appears to
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Hypovolemia Resulting in Platypnea-Orthodeoxia Syndrome
2016, Journal of Emergency MedicineCitation Excerpt :The former has been documented to occur with a pericardial effusion, postpneumonectomy, or right ventricular ischemia (3,4). The latter can occur with an aortic aneurysm, right atrial myoxoma, abnormal anatomy of the superior vena cava, tricuspid regurgitation, kyphosis, or a prominent Eustachian valve, which is the inferior vena caval valve that helps direct blood through the foramen ovale in fetal circulation (3,4,9,10). Patients with POS are often elderly, which is likely caused in part by right atrial chamber anatomic distortion, which then facilitates blood flow through the interatrial shunt (11).
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