Abstract:

Severe postpartum hemorrhage is a necessary"window phrase"during which patients progress toward critical illness or even death.Besides the amount of blood loss reaches a severe level，this phase triggers activation of compensatory mechanisms，leading to a cascade of clinical manifestations.If medical staff could observe carefully and survey these abnormal signs，correct diagnosis can be made and appropriate treatment can be initiated as early as possible.This proactive approach minimizes physical dysfunction and death caused by postpartum hemorrhage to the greatest extent.

Key words: Severe postpartum hemorrhage, compensatory, shock index