1) Breathing abnormality 
In medicine, platypnea (sometimes referred to as Platypnea-Orthodeoxia syndrome)refers to shortness of breath (dyspnea) that is relieved when lying down, and worsens when sitting or standing up. It is the opposite of orthopnea. The word is derived from the Greek platus (= flat) and pnoia (=breath). ==Causes== Platypnea is due to either hepatopulmo...
Difficulty in breathing when erect, relieved by recumbency. ... Compare: orthopnea. ... Origin: platy-+ G. Pnoe, a breathing ... (05 Mar 2000) ... 
(plә-tip´ne-ә) dyspnea that is relieved when the patient is lying flat; see also orthopnea.
Type: Term Pronunciation: plă-tip-nē′ă Definitions: 1. Difficulty in breathing when upright, which is relieved by recumbency.
platypnea Difficulty in breathing when erect, relieved by recumbency (in other words, by lying flat).