This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Shock index (HR/SBP) can be used to know the severity of the bleeding in cases of hemorrhage. Which of the following is most indicative for significant PPH 
Select and explain. 
A. 0.3-0.5, B. 0.5-0.7, C. 0.7-0.9, D. 0.9-1.1
D: 0.9-1.1
Answer: D: 0.9-1.1 
Explanation: Ans. d. 0.9-1.1 elevated shock index (hea rate/systolic blood pressure >0.9) maybe signs of tissue hypoperfusion Shock Index Shock index (SI), defined as the ratio of hea rate (HR) to systolic blood pressure (SBP). Shock index >0.9: Sign of tissue hypoperfusionQ Shock index (SI) = Hea rate (HR)/ Systolic blood pressure (SBP)