In medicine, platypnea refers to shortness of breath (dyspnea) that worsens when sitting or standing up. It is the opposite of orthopnea. The word is derived from the Greek "platus" (= flat) and "pnoia" (=breath).

Platypnea is due to either hepatopulmonary syndrome or an anatomical cardiovascular defect increasing positional right-to-left shunting (bloodflow from the right to the left part of the circulatory system). These defects include rare syndromes in which the venous blood from the liver does not pass through the lungs, or if venous blood from the portal circulation reaches the inferior vena cava without passing through the liver (Abernethy malformation, type 1).

Insuficiency of abdominal muscles causes lower diafragm position and dyspnea. In clinostatism, abdominal organs push the diafragm in his normal, upper position, reducing the respiratory effort.Fact|date=May 2008

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