Annual report of Subcommittee for Examination of Causes of Maternal Death and their Prevention in Perinatology Committee, Japan Society of Obstetrics and Gynecology, 2013.

The article discusses the result of studies which examined the causes of maternal death. It analyzes the pathology of atonic bleeding and amniotic fluid embolism to determine ways to prevent maternal death. The findings reveal that fibrinogen level decreases earlier than antithrombin and platelet during atonic bleeding.