Endocrine Characteristics and Obstetric Outcomes of PCOS Patients with Successful IVF and Non-IVF Pregnancies

<b>Background/Objective:</b> Infertility affects an estimated 40-50% of women with polycystic ovary syndrome (PCOS), the leading cause of anovulatory infertility, but only a small proportion of the patients require in vitro fertilization (IVF) therapy. Both PCOS and IVF are associated with an increased risk of obstetric complications. To compare preconception endocrine profiles and symptoms, as well as obstetric outcomes of PCOS patients who achieved successful pregnancies with and without IVF treatment. <b>Methods:</b> A single-center retrospective cohort study was conducted. Data spanning from 2012 to 2019 were compiled from patients with PCOS who visited the Gynecologic Endocrinology Unit and the Infertility Unit at the Department of Obstetrics and Gynecology, University of Debrecen. Patients diagnosed with PCOS who had had at least one successful delivery beyond the 23rd gestational week at the department were eligible for inclusion in the study. <b>Results:</b> Fifteen percent of the 206 pregnancies leading to successful deliveries of 232 newborns in our cohort conceived with IVF. A one year increase in the maternal age increased the odds of being in the IVF group by 22% (OR: 1.222, 95% confidence interval, CI: 1.11-1.35, <i>p</i> < 0.001). Baseline DHEAS and androstenedione levels were significantly lower in the IVF group as compared to the non-IVF group: 1 μmol/L increase in the DHEAS level decreased the odds of being in the IVF group by 18% (OR: 0.82, 95% CI: 0.66-1.01, <i>p</i> = 0.06), and 1 μg/L increase in the serum androstenedione concentration decreased the same odds by 42% (OR: 0.58, 95% CI: 0.33-1.02, <i>p</i> = 0.056). DHEAS levels <6.5 μmol/L had an OR 3.86 (95% CI 1.10-13.50, <i>p</i> = 0.04) and LH/FSH ratio <1.3 had an OR 3.58 (95% CI 1.18-10.81, <i>p</i> = 0.03) for being in the IVF group. The birth weight (3069 ± 683 g vs. 3362 ± 638 g, <i>p</i> = 0.02) and the gestational age (37.23 ± 2.55 vs. 38.54 ± 2.28 weeks, <i>p</i> = 0.004) were significantly lower in the IVF group, but in the singleton subgroups, no significant differences could be found. Birth weight percentiles showed no significant difference in either subgroup. In the IVF group, both preterm delivery (29% vs. 8.3%, OR 4.53, 95% CI 1.75-11.70, <i>p</i> = 0.002; singleton subgroup: 17.4% vs. 6.3%, OR 3.12, 95% CI 0.89-10.92, <i>p</i> = 0.07) and cesarean section (71% vs. 43.2%, OR 3.22, 95% CI 1.40-7.40, <i>p</i> = 0.006; singleton subgroup: 65.2% vs. 42.4%, OR 2.55, 95% CI 1.02-6.35, <i>p</i> = 0.04) were more frequent than in the non-IVF group. Gestational diabetes and preeclampsia were not significantly different in the IVF and non-IVF groups. <b>Conclusions:</b> In PCOS patients with successful pregnancies, those who conceive with IVF seem to be different in their baseline hormone levels and symptoms from the non-IVF group. Adverse obstetric outcomes are more common in the IVF group, and some of these differences persist when adjusting for singleton pregnancies and maternal age, too.