In plain words
Dependent edema is swelling that gathers in the lowest parts of the body because of gravity. It is most often seen in the feet, ankles, and lower legs. In pregnancy, blood and fluid volumes rise, and the growing uterus presses on the veins that return blood from the legs. Standing or sitting still for long periods makes the swelling worse. It is often worse by the end of the day and better after rest or lying on the side. Most dependent edema is ordinary and does not harm the baby. Swelling that is sudden, that is in the face or hands, or that comes with headache, vision changes, or upper belly pain needs same-day care, because those can be signs of . A provider can help sort the cause.
The deeper version
Plasma volume rises by about 45 percent and cardiac output by 30 to 50 percent across pregnancy, with peripheral vasodilation and increased venous compliance (Hytten, Clinical Haematology, 1985; Robson and colleagues, American Journal of Physiology, 1989). The gravid uterus compresses the inferior vena cava and iliac veins, so prolonged motionless standing reduces venous return and pools blood in the legs. This predisposes to dependent edema, , and varicosities. Generalized or rapidly progressive edema, particularly facial and hand edema, raises the question of preeclampsia rather than dependent edema, and unilateral leg edema raises the question of . Guidance on edema as a diagnostic criterion has been revised, and its weight in diagnosing preeclampsia is now limited.
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Sources
- Hytten F — Blood volume changes in normal pregnancy. Clinics in Haematology, 1985
- Robson SC, Hunter S, Boys RJ, Dunlop W — Serial study of factors influencing changes in cardiac output during human pregnancy. American Journal of Physiology, 1989