Dahl et al reported a model for predicting successful external cephalic version. The authors are from Northwestern University and Yale University.
Patient selection: pregnant woman with fetal malpresentation
Goal of external cephalic version: manually rotate the fetus so that the head has a cephalic presentation
Parameters:
(1) body mass index (BMI) in kg per square meter
(2) parity
(3) placental location
(4) type of fetal malpresentation
|
Parameter
|
Finding
|
Points
|
|
BMI
|
|
-0.0314 * (BMI)
|
|
parity
|
nulli
|
-0.9288
|
|
|
multi
|
0
|
|
placental location
|
anterior
|
-0.5113
|
|
|
other
|
0
|
|
fetal malpresentation
|
transverse or oblique
|
1.0218
|
|
|
other
|
0
|
value of X =
= SUM(points for all of the parameters) + 1.1726
probability of successful external cephalic version =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.67.
