Retroverted Uterus in the First Trimester and Associated Pregnancy Outcomes.

Area of Science:

• Obstetrics and Gynecology
• Reproductive Medicine
• Fetal Ultrasound

Background:

• The association between a retroverted uterus identified during nuchal translucency (NT) ultrasound and pregnancy outcomes is not well-established.
• Understanding these associations is crucial for accurate patient counseling and management.

Purpose of the Study:

• To investigate the relationship between a retroverted (RV) uterus detected on NT ultrasound and second-trimester pregnancy loss.
• To explore other adverse pregnancy outcomes associated with a retroverted uterus.

Main Methods:

• Retrospective cohort study comparing patients with a retroverted uterus (RV) to those with an anteverted (AV) uterus.
• Exclusion criteria included multiple gestation, Mullerian anomalies, and fetal aneuploidy.
• Statistical analysis used Fisher's exact test, Mann-Whitney test, and multivariable logistic regression.

Main Results:

• No significant difference in second-trimester pregnancy loss was observed between RV and AV groups (0% vs. 1.2%, p=0.55).
• Patients with a retroverted uterus were four times more likely to experience first-trimester vaginal bleeding (16.9% vs. 4.2%, OR=4.1, p=0.0056) after adjusting for race and IVF.
• A significantly higher proportion of RV patients conceived via in vitro fertilization (IVF) (11% vs. 3%, p=0.018).

Conclusions:

• A persistent retroverted uterus in the first trimester is associated with an increased risk of first-trimester vaginal bleeding.
• Despite the increased bleeding risk, pregnancy loss rates were similar, offering valuable information for patient counseling.
• The higher incidence of IVF conception in the RV group warrants further investigation.