ArticleCureus2026
Platypnea-Orthodeoxia Syndrome Caused by a Patent Foramen Ovale and Interatrial Septal Aneurysm: A Case Report.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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3 authors.
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Abstract
Platypnea-orthodeoxia syndrome (POS) is a rare condition characterized by positional hypoxemia, often due to right-to-left shunting across a patent foramen ovale (PFO) despite normal right-sided pressures. Early recognition is essential as symptoms may be subtle and imaging is often unrevealing. A 78-year-old female patient with a known PFO presented with one week of lower abdominal pain and mild exertional dyspnea without chest pain. She was profoundly hypoxic to 76% on room air, with improvement when supine and worsening when upright. Initial labs were unremarkable, and arterial blood gas revealed primary respiratory alkalosis with severe hypoxemia. Despite unremarkable chest radiography, CT angiography, and ECG, oxygen via high-flow nasal cannula at 100% FiO
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