Soon after an uncomplicated delivery at 38 weeks gestation, a mother develops respiratory difficulties and uncontrolled vaginal bleeding progressing to shock, multiorgan failure and death. At autopsy, masses of debris and epithelial squamous cells are apparent in the pulmonary microcirculation. Which of the following was the likely cause of death?
Sheehan syndrome Chorioamnionitis Abruptio placentae Amniotic fluid embolism