NCLEX Emergency Nursing Practice Test

Trendelenburg positioning increases venous return to the heart by using gravity to push blood from the legs toward the central circulation. In hypovolemic shock, circulating blood volume is reduced, so boosting preload can transiently improve cardiac output and blood pressure as a short-term measure while fluids and definitive treatment are started. It isn’t beneficial for other shock types, because in cardiogenic shock a stronger preload can worsen heart failure and pulmonary edema, while in septic or neurogenic shock the primary issue is maldistribution of blood flow or loss of vascular tone, which this maneuver does not fix. So this position is typically used to support perfusion in low-volume states, as a temporary aid rather than a lasting solution.