A patient recovering from surgery exhibits localized edema despite normal kidney function. Why does impaired lymphatic drainage contribute to this fluid accumulation?

💡 Explanation

Impaired lymphatic drainage obstructs interstitial fluid removal because the lymphatic system is responsible for returning excess fluid and proteins to the bloodstream; therefore, fluid accumulates in the interstitial space, leading to edema, rather than being effectively cleared. Changes in oncotic or hydrostatic pressure, or vascular permeability do not directly explain this specific drainage issue.

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