The first step in management of uterine atony is uterine massage. Used in postpartum hemorrhage caused by uterine atony not controlled by other methods. Santonin also was used in a lesser extent in treatment of atony of the bladder. It can be associated with uterine atony. Retained placental tissue and infection may contribute to uterine atony. Other risk factors include uterine atony, placenta previa, and connective tissue disorders. Clinically, 75-80% of postpartum hemorrhages are due to uterine atony. Uterine atony is a loss of tone in the uterine musculature. Uterine atony may result from muscular exhaustion after unusually strong and rapid labor.