Risk Factors of Oya et al for Peripartum Blood Transfusion for a Woman with Placenta Previa

Overvie:

Oya et al identified risk factors associated with maternal blood transfusion in the peripartum period associated with placenta previa. These can help to identify a woman who may benefit from extra precautions during delivery, including the availability of blood for transfusion (i.e., no home delivery).

 

Patient selection: pregnant woman with placenta previa (partial or complete)

 

Parameters:

(1) maternal age

(2) history of dilatation and curettage (D & C)

(3)type of placenta previa (complete previa = complete coverage of the internal os by the placenta)

 

Parameter	Finding	Points
age of the mother	<= 34 years	0
	> 34 years ("advanced")	1
number of D & Cs in the past	0 or 1	0
	2 or more	1
placenta previa	none or partial previa	0
	complete previa	1

 

number of risk factors =

= SUM(points for all 3 parameters)

 

Interpretation:

• minimum score: 0

• maximum score: 3

• The risk of bleeding that requires blood transfusion increases with the number of risk factors.