Effect of posture on formation and evacuation of lymph

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Abstract
In the anesthetized dog, tilting of the whole animal, hindlimbs downward, first stops or markedly decreases the thoraic duct lymph flow which then returns toward or above control level. On return of the dog to the horizontal position, the thoraic duct lymph flow rises above control and tilting levels, reaching immediately its maximal value then returning toward control progressively. It is concluded that during tilting, gravity interferes with the evacuation of lymph and interstitial fluid. The present work indicates that gravity is an important factor in the pathogenesis of dependent edema not only because it increases capillary filtrate formation and hence lymph formation but also because it interferes with the evacuation of tissue fluids and lymph, and it corroborates that the evacuation of tissue fluids and lymph and its determinants are an important factor in the lymph circulation.

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