Mode of conception does not appear to affect placental volume in the first trimester.

OBJECTIVE

To study whether infertility treatments, including IVF and non-IVF fertility treatments, are associated with diseases of placental insufficiency in early gestation. First trimester placental volumes by ultrasound and chorionic villi weight during sampling (CVS) were performed to detect differences between pregnancies conceived spontaneously versus with fertility treatments.

DESIGN

Retrospective cohort.

SETTING

Academic tertiary center.

PATIENT(S): Women with singleton pregnancies undergoing CVS and first trimester ultrasound from April 2007 to November 2015.

INTERVENTION(S): Estimated placental volume (EPV) was calculated from ultrasound images using a validated computation and CVS estimated tissue weight was performed using a validated visual analogue scale.

MAIN OUTCOME MEASURE(S): Adjusted linear regression was used to compare EPV and CVS weight based on mode of conception.

RESULT(S): A total of 1,977 spontaneous and 334 conceived with fertility treatments (133 non-IVF and 201 IVF) pregnancies were included. Significant differences in maternal age, gravidity, hypertension, and smoking status were identified. EPV and CVS weight were correlated with maternal age, gestational age, and maternal hypertension. Adjusted linear regression showed no difference in EPV in pregnancies conceived with fertility treatments versus spontaneously. The CVS weight was significantly lower in the IVF conceptions in unadjusted univariate analyses. However, after adjusted regression, this was no longer significant.

CONCLUSION(S): Mode of conception does not appear to affect first trimester placental size. As differences in maternal age, hypertension, and smoking status differ among the groups and are correlated to placental size, it may be the underlying patient population leading to abnormal placentation and insufficiency, not the fertility treatments used.