Impact of vaginism on mode of delivery and obstetrical outcomes

Introduction

According to ICD 10, vaginism is defined as the presence of spasm of the pelvic floor muscles surrounding the vagina, causing occlusion of the vaginal opening. Intromission is impossible or painful. Vaginism, whose prevalence is estimated at 1%, is often diagnosed during pregnancy follow-up, when clinical examination is difficult or impossible. However, few studies report obstetrical complications and pregnancy outcomes associated with this pathology.

Objective

Evaluate the impact of vaginism on mode of delivery and obstetrical complications.

Materials and methods

Comparative, monocentric, retrospective study at the Montreuil maternity hospital between January 2019 and January 2024 that included all singleton deliveries in cephalic presentation at term. Vaginism was defined as an involuntary contraction of the pelvic muscles that made clinical examination during pregnancy impossible. Mode of delivery (caesarean section during labour, operative delivery, spontaneous vaginal delivery) and obstetric complications (episiotomy, OASIS, complex tear, Postpartum haemorrhage (PPH) due to tear) were compared between patients with vaginism and a control group, in univariate analysis and multivariate logistic regression with adjustment for maternal age, BMI, maternal origin, gestational age, high obstetrical and medical risk level, diabetes with or without insulin use, pregnancy complications, Robson group and birthweight. A propensity score adjustment with matching 1 case to 3 controls was conducted.

Results

During the study period, 13,469 patients were included, among which 440 patients had vaginism. In univariate analysis, patients with vaginism had a higher rate of caesarean section (16,8% versus 9,4%, p < 0.001), operative delivery (29,3% versus 13,3%, p < 0.001), episiotomy (12,5% versus 5.3 %, p < 0.001), OASIS (3.4 % versus 1.0 %, p < 0.001), complex tear (17,5% versus 7,7%) and PPH due to tear (2,5% versus 1,1%, p = 0,009).

After adjustment, vaginism appeared to be an independant risk factor for cesarean section with a psaOR of 1.38 [1.02–1.85], operative delivery psaOR 2.39 [1.83–3,10], OASIS psaOR 2,19 [1.10–4,27], and complex tear psaOR 1,39 [1,02–1,87]

Conclusion

Vaginism appears to be an independent risk factor for cesarean section, operative delivery, OASIS, and complex tear. Further studies should evaluate the impact of early and appropriate follow-up during pregnancy on adverse obstetrical outcomes.