Ohopnea in hea failure develops due to:
Ohopnea is shoness of breath that occurs when a person is supine. Gravitational forces cause fluid to become sequestrated in the lower legs and feet when the person is standing or sitting. When the person assumes a recumbent position fluid from the legs (leg veins) and dependent pas of the body is mobilized and redistributed to an already distended pulmonary circulation. Ref: Hea failure: a clinician's guide to ambulatory diagnosis and treatment By Mariell L. Jessup, Evan Loh, Page 28
Reservoir function of pulmonary veins
Reservoir function of leg veins
Reservoir function of pulmonary aeries
Reservoir function of leg aeries