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Pulmonary Edema in dogs

Description
In normal lungs, fluid passes from the blood vessels to the lung tissue itself and then returns to the circulating blood via the lymphatic system. This process is continuous, and this cycle is how oxygen is transported from the lungs to the heart, to all body tissues, and then returns to the lungs again for re-oxygenation. But when the formation of fluid exceeds the fluid removal, pulmonary edema, or excess fluid in the lungs, occurs. Pulmonary edema is an important problem because it interferes with exchange of oxygen at the lung-airway junction.



Additional information


Definition
An accumulation of extravascular fluid in the pulmonary interstitial and alveolar spaces.

Pathophysiology
In normal lungs, fluid exudes from the pulmonary capillaries into the interstitial space and is returned to the circulation via the pulmonary lymphatic vessels. This dynamic process is dependent upon capillary and interstitial hydrostatic and oncotic pressures and upon capillary and alveolar epithelial permeability. When fluid formation exceeds fluid removal by the lymphatic vessels, pulmonary edema results. When edema becomes clinically important, pulmonary gas exchange is impaired and clinical signs develop.

Systems affected
Pulmonary Cardiovascular
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