Yang et al reported a nomogram for predicting placenta accreta in a woman with a scarred uterus. The authors are from Shengjing Hospital of China Medical University, Key Laboratory of Maternal-Fetal Medicine of Liaoning Province and Key Laboratory of Obstetrics and Gynecology of Higher Education of Liaoning Province in China.
Patient selection: pregnant woman with a history of previous uterine surgery
Parameters:
(1) placenta previa
(2) number of previous cesarean sections (CS)
(3) number of episodes of vaginal bleeding (presumably during the current pregnancy)
(4) medications taken during the pregnancy (antihypertensive, hypoglycemic, hormones, NSAIDs, etc)
Parameter
Finding
Points
placenta previa
no
0
yes
10
number of previous CS
0
0
1
2.62
>= 2
3.93
vaginal bleeding number
0
0
1
1
>= 2
1.54
medications during pregnancy
no
0
yes
1.95
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 17.42
value of X =
= (0.4785 * (score)) - 6.27
probability of placenta accreta =
= 1 / (1 + EXP((-1) * X))
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