Abstract
Objective: This study aims to evaluate obstetric and neonatal outcomes in pregnancies complicated by RDs and to identify hemogram-derived biomarkers associated with adverse perinatal events. Methods: This retrospective cohort study analyzed 360 pregnancies in individuals diagnosed with rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), systemic sclerosis (SSc), ankylosing spondylitis (AS), Sjögren's disease, sarcoidosis, undifferentiated connective tissue disease (UCTD), and other autoimmune conditions, followed up at the Department of Obstetrics and Gynecology, Ankara University Faculty of Medicine, between 2013 and 2018. Data on disease activity, maternal complications, neonatal outcomes, and inflammatory markers were extracted from electronic medical records. Results: Patients with SSc had the highest rates of preterm birth (57.1%) and fetal growth restriction (FGR) (42.9%), whereas those with SLE (50%) and AS (25%) exhibited the highest disease flare rates. Neonates born to mothers with SSc, SLE, and Sjögren's disease had significantly lower Apgar scores, suggesting increased neonatal distress. NICU admission was associated with elevated neutrophil-to-lymphocyte ratio (NLR) and eosinophil-to-lymphocyte ratio (ELR), with higher NLR and ELR also predicting spontaneous abortion. Monocyte-to-lymphocyte ratio (MLR) and ELR demonstrated the highest predictive value for composite adverse perinatal outcomes. Additionally, RA patients experiencing disease flares had an 87.5% cesarean section (CS) rate, significantly exceeding the general population rate. Conclusions: This study underscores the increased risk of preterm birth, FGR, and neonatal complications in RD pregnancies, particularly in SSc and SLE patients. The findings suggest that early risk assessment using hemogram-based inflammatory markers may improve perinatal management and patient stratification.