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Value of routine ultrasound examination at 35–37 weeks' gestation in diagnosis of non-cephalic presentation

Ultrasound in Obstetrics & Gynecology Nov 06, 2019

De Castro H, et al. - Researchers conducted a retrospective analysis of prospectively collected data in 45,847 singleton pregnancies in order to assess the incidence of non-cephalic presentation at a routine scan at 35+0 - 36+6 weeks' gestation. Further, they reported on subsequent management of such pregnancies. At 35+0 - 36+6 weeks, cephalic fetal presentation was reported in 43,416 (94.7%) pregnancies; presentation was breech in 1,987 (4.3%) and transverse or oblique in 444 (1.0%). As per multivariable analysis, chance of non-cephalic presentation increased with increasing maternal age and weight, decreasing height, earlier gestational age at scan; the chance was higher in the presence of placenta previa, oligohydramnios and polyhydramnios, in nulliparous than parous women and lower in women of South Asian and mixed racial origin than in White women. Analysis suggests that a routine ultrasound examination at 35+0 - 36+6 weeks' gestation can aid in overcoming the problem of unexpected non-cephalic presentation in labor to a great extent. In about 40% of cases with a non-cephalic presentation at the 35+0 - 36+6 weeks, the presentation at birth was cephalic; this was mainly due to subsequent spontaneous rotation and to a lesser extent as a consequence of successful ECV.
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