Maternity HESI 1,2 1. A 38-week primigravida who works as a secretary and sits at a computer for 8 hours each day tells the nurse that her feet have begun to swell. Which instruction would be most effective in preventing pooling of blood in the lower extremities? Move about every hour Pooling of blood in the lower extremities results from the enlarged uterus exerting pressure on the pelvic veins. Moving about every hour will straighten out the pelvic veins and increase venous return. ...