Q. A 30-year-old primigravida undergoes a spontaneous vaginal delivery and delivers a healthy baby boy weighing 2.9 kg. The placenta has been expelled and the uterus remains atonic and flaccid with a blood loss of > 600 ml. The bleeding has been controlled with continuous oxytocin infusion and transfusion of 4 units of packed red blood cells. On the second day of delivery, she complains of extreme tiredness. Her temperature is 98.4°F (36.9°C), pulse is 100/min, blood pressure is 98/60 mmHg, and respirations are 14/min. This patient is at increased immediate risk of which of the following condition?