Pregnancy outcome after cervical conisation: a retrospective cohort study in the Leuven University Hospital.

OBJECTIVE

To assess pregnancy outcome after conisation.

DESIGN

Retrospective cohort study.

SETTING

Belgium, data from a university hospital.

POPULATION

Fifty-five pregnancies in 34 women after conisation, and 55 pregnancies in 54 women without a history of conisation or cervical intraepithelial neoplasia (CIN).

METHODS

Hospital data were reviewed and questionnaires were collected from 599 women who had a conisation in a 5-year period, among whom subsequent pregnancies were identified. The control group consisted of matched pregnancies of women without a history of conisation.

MAIN OUTCOME MEASURES

Gestational age at delivery, neonatal biometry, neonatal condition at birth.

RESULTS

Numbers of sexual partners (4.6 +/- 3.4 SD versus 2.5 +/- 2.5 SD) and ex-smokers were significantly higher in the study group compared with the control group. Gestational age at delivery (266 +/- 2 days versus 274 +/- 9 days), neonatal head circumference (33.9 +/- 2.5 cm, versus 34.6 +/- 2.5 cm) and birthweight (3088 +/- 754 g versus 3381 +/- 430 g) were significantly lower in the study group compared with the control group. Numbers of preterm [<37 weeks; 14/55 (25%) versus 2/55 (4%); P = 0.002] and severe preterm (<34 weeks; 6/55 (11%) versus 0/55 (0%); P = 0.031] deliveries in the study group were significantly higher. There were no cases of perinatal mortality.

CONCLUSIONS

Conisation affects obstetrical outcome after conisation for CIN. Babies tend to be born earlier and are smaller. It is not clear whether this is related to the procedure or to factors linked with CIN.