Amniotic fluid embolism is a rare but extremely dangerous gynecological complication, with a mortality rate of up to 80%. Currently, amniotic fluid embolism cannot be prevented and there is no effective treatment.

Pituitary necrosis in Sheehan's syndrome is a rare but life-threatening endocrine disease. Early recognition of the signs of the disease will help detect and avoid life-threatening complications.

Postpartum hemorrhage is the leading cause of death in obstetrics. Postpartum hemorrhage occurs in more than 10% of births, and 25% of maternal deaths are due to severe postpartum hemorrhage.