Uterine Artery Embolization for Primary Postpartum Hemorrhage.

Postpartum hemorrhage (PPH) is a common source of morbidity and mortality for delivering mothers worldwide, resulting in greater than 100,000 deaths per annum. Pathologic postpartum hemorrhage is defined as blood loss greater than 500 mL for vaginal deliveries and 1,000 mL for caesarean births, which occurs in up to 10% of deliveries. Severe postpartum hemorrhage can progress to shock, disseminated intravascular coagulation (DIC) and death. PPH is further characterized by time of onset; primary PPH occurs within 24 hours of parturition, and secondary PPH beyond that. Secondary hemorrhage is discussed in a separate article in this issue, this article will exclusively explore primary postpartum hemorrhage. PPH arises from a number of etiologies, including uterine atony, birth canal/perineal lacerations and intrapelvic arterial injuries. PPH is primarily managed by standard medical obstetric maneuvers including uterotonics, fundal massage, intrauterine (Bakri) balloon tamponade and direct control of hemorrhage where applicable. Definitive control with hysterectomy is preserved for hemorrhage refractory to conservative and minimally-invasive management. First described in 1979, angiography and trans-catheter embolization represent valuable tools in the control of postpartum hemorrhage of most etiologies. Embolization is an acceptable, effective alternative to hysterectomy, particularly in patients who desire future fertility. It has high clinical success rates and a body of literature supporting preserved post-embolization fertility.