Matilda Gunderson,a 55-Year-Old Woman with Uterine Cancer,is Scheduled for an Open

Matilda Gunderson,a 55-year-old woman with uterine cancer,is scheduled for an open panhysterectomy.She is positioned in low lithotomy with her legs symmetrically arranged in padded cradle stirrups.After the incision is made and primary dissection accomplished,she will be positioned in Trendelenburg position to facilitate exposure of the lower pelvis and displacement of the small bowel from the operative area.Matilda is at risk for compromise and injury related to prolonged Trendelenburg tilt,which promotes:

A) decreased pulmonary compliance and functional residual capacity.
B) increased popliteal congestion and peripheral vascular collapse.
C) shearing force injury from sliding toward the head of the OR bed.
D) avascular ischemic changes to the lower leg and feet from gravitational devascularization.