Original sentence: It is the opposite of platypnoea.Orthopnea or orthopnoea (Greek from ortho, straight + pnoia, breath) is dyspnea which occurs when lying flat, causing the person to have to sleep propped up in bed or sitting in a chair
Edited sentence: It is the opposite of platypnea.Orthopnea or orthopnoea (Greek from ortho, straight + pnoia, breath) is shortness of breath (or dyspnea) which occurs when lying flat, causing the person to have to sleep propped up in bed or sitting in a chair