The appropriate volume of stored autologous blood required for postpartum hemorrhage

• Published in: Journal of Japan Society of Perinatal and Neonatal Medicine Vol. 58; no. 3; pp. 486 - 491
• Main Authors: Yamanouchi, Keiko, Watanabe, Norikazu, Watanabe, Mariko, Fukase, Mika, Nagase, Satoru, Ito, Tomomichi, Idei, Urara
• Format: Journal Article
• Language: Japanese
• Published: Japan Society of Perinatal and Neonatal Medicine 2022; 一般社団法人 日本周産期・新生児医学会
• Subjects: autologous transfusion; placenta accreta; placenta previa; postpartum hemorrhage
• ISSN: 1348-964X; 2435-4996
• DOI: 10.34456/jjspnm.58.3_486

【Objective】This study aimed to determine the appropriate volume of stored blood required for autologous transfusion in patients with postpartum hemorrhage. 【Method】We retrospectively collected data from mothers who stored autologous blood and delivered at our hospital from January 2015 to March 2019. We developed model protocols to determine the appropriate volume of stored autologous blood and estimated the volume required for autologous and allogenic transfusions based on each model protocol. 【Results】There were 55 cases, and the reasons for storing autologous blood were placenta previa（51%）, rare blood type（27%）, placenta accreta（11%）, low lying placenta（9%）, and leiomyoma（9%）. The average volume of stored blood was 757mL（300–1,400mL）, and the average volume for autologous transfusion was 486mL（0–1,200mL）. Six cases also used the stored blood for allogenic blood transfusion（average 1,440mL, 280－3,600mL）. According to the simulation by model protocols, the appropriate volume of stored autologous blood was 400mL at baseline and 800mL for cases with placental abnormalities（including placenta previa, accrete, and low-lying placenta）. For cases with placental lacunae in ultrasonographic findings, >400mL of stored blood was used. 【conclusion】The results of this study suggested that we can optimize the volume of stored autologous blood based on the reason for utilization and ultrasonographic placental findings in each case.