This is the first of a special podcast series on obstetric critical care.  I am joined on this series by Dr. Elizabeth Garchar, MD, FACOG.  She is an OB/GYN and Maternal Fetal Medicine (MFM) specialist who has a special interest in obstetric critical care.  She is also unique in that she flies regularly with our critical care transport teams and acts as one of our Assistant Medical Directors for the flight program.  So, Dr. Garchar has unique insight into managing this population in transport. This podcast focuses on severe postpartum hemorrhage.  We discuss the epidemiology and risk factors as well as the nuances of diagnosis, specifically how blood loss is actually quantified in this setting.  We also go through the importance of point-of-care ultrasound to help identify and manage the causes of postpartum hemorrhage.  Then, we transition to the discussion of management, focusing on the medical management of uterine atony, and also go over advanced interventions such as uterine packing, balloon tamponade devices, and REBOA.  Finally, Dr. Garchar discusses the indication and procedure for emergent hysterectomy as well as the post-procedure management critical care transport crews may have to perform.   References   Practice Bulletin No. 183: Postpartum Hemorrhage. Obstet Gynecol. Oct 2017;130(4):e168-e186. doi:10.1097/aog.0000000000002351 Abdel-Aleem H, Singata M, Abdel-Aleem M, Mshweshwe N, Williams X, Hofmeyr GJ. Uterine massage to reduce postpartum hemorrhage after vaginal delivery. Int J Gynaecol Obstet. Oct 2010;111(1):32-6. doi:10.1016/j.ijgo.2010.04.036 Abul A, Al-Naseem A, Althuwaini A, Al-Muhanna A, Clement NS. Safety and efficacy of intrauterine balloon tamponade vs uterine gauze packing in managing postpartum hemorrhage: A systematic review and meta-analysis. AJOG Glob Rep. Feb 2023;3(1):100135. doi:10.1016/j.xagr.2022.100135 Aibar L, Aguilar MT, Puertas A, Valverde M. Bakri balloon for the management of postpartum hemorrhage. Acta Obstet Gynecol Scand. Apr 2013;92(4):465-7. doi:10.1111/j.1600-0412.2012.01497.x Bagga R, Jain V, Kalra J, Chopra S, Gopalan S. Uterovaginal packing with rolled gauze in postpartum hemorrhage. MedGenMed. Feb 13 2004;6(1):50. Borger van der Burg BLS, van Dongen T, Morrison JJ, et al. A systematic review and meta-analysis of the use of resuscitative endovascular balloon occlusion of the aorta in the management of major exsanguination. Eur J Trauma Emerg Surg. Aug 2018;44(4):535-550. doi:10.1007/s00068-018-0959-y Castellini G, Gianola S, Biffi A, et al. Resuscitative endovascular balloon occlusion of the aorta (REBOA) in patients with major trauma and uncontrolled haemorrhagic shock: a systematic review with meta-analysis. World J Emerg Surg. Aug 12 2021;16(1):41. doi:10.1186/s13017-021-00386-9 Collaborators WT. Effect of early tranexamic acid administration on mortality, hysterectomy, and other morbidities in women with post-partum haemorrhage (WOMAN): an international, randomised, double-blind, placebo-controlled trial. Lancet. May 27 2017;389(10084):2105-2116. doi:10.1016/S0140-6736(17)30638-4 Cunningham FG, Nelson DB. Disseminated Intravascular Coagulation Syndromes in Obstetrics. Obstet Gynecol. Nov 2015;126(5):999-1011. doi:10.1097/AOG.0000000000001110 D'Alton M, Rood K, Simhan H, Goffman D. Profile of the Jada(R) System: the vacuum-induced hemorrhage control device for treating abnormal postpartum uterine bleeding and postpartum hemorrhage. Expert Rev Med Devices. Sep 2021;18(9):849-853. doi:10.1080/17434440.2021.1962288 Dildy GA, 3rd. Postpartum hemorrhage: new management options. Clin Obstet Gynecol. Jun 2002;45(2):330-44. doi:10.1097/00003081-200206000-00005 Dueckelmann AM, Hinkson L, Nonnenmacher A, et al. Uterine packing with chitosan-covered gauze compared to balloon tamponade for managing postpartum hemorrhage. Eur J Obstet Gynecol Reprod Biol. Sep 2019;240:151-155. doi:10.1016/j.ejogrb.2019.06.003 Erez O. Disseminated intravascular coagulation in pregnancy: