Effect of adenomyosis on placenta-related obstetric complications

Research question: What is the relationship between sonographic diagnosis of isolated adenomyosis and placenta-associated obstetric outcomes? Design: In this 12-year retrospective cohort study (2010–2022), patients presenting with adenomyosis-related symptoms were assessed via ultrasound. The study included 59 women diagnosed with adenomyosis and 62 controls, leading to 203 births (90 in the adenomyosis group and 113 in the control group). Patients with endometriosis, uterine fibroids and anomalies, and those using assisted reproductive technology were excluded. The primary outcome focused on a composite of placenta-associated adverse outcomes, including preterm birth, small-for-gestational-age fetuses, hypertensive disorders of pregnancy, placental abruption and post-partum haemorrhage. Results: No clinically significant differences in demographic characteristics were noted between the two groups. However, the adenomyosis group showed a significantly higher rate of adverse placental function outcomes (27%) compared with the control group (11%, P = 0.005). Adjusted analyses for maternal age, parity and aspirin usage revealed increased risk of hypertensive disorders (adjusted OR 5.91, 95% CI 1.50–30.0; P = 0.017) and adverse placental function outcomes (adjusted OR 3.44, 95% CI 1.53–8.09; P = 0.003) in the adenomyosis group. Conclusion: Adenomyosis is significantly associated with increased risk of adverse placental function outcomes and hypertensive disorders of pregnancy. These findings suggest that adenomyosis may have a distinct impact on pregnancy, underscoring the need for further research to elucidate specific sonographic characteristics of adenomyosis and their effects on placental function.