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Platypnoea–orthodeoxia syndrome
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    Platypnoea-orthodeoxia syndrome: is it so rare?
    Dear Editor:

    We read with interest the article by Kubler et al[1] concerning 3 patients with platypnoea-orthodeoxia syndrome. As reported, this syndrome is infrequent and the diagnosis can be difficult. It is characterised by dyspnoea and arterial hypoxaemia induced by upright position that resolved by recumbency. This is usually the consequence of right-to-left shunt at the atrial level. Such shunting is frequent in...

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    Conflict of Interest:
    None declared.