Consequences of preconception bariatric surgery for fetal size and pathological growth restriction: a linked population registry study.

In Canada, 20-30% of reproductive-aged women suffer from obesity, which increases the chances that they will experience pregnancy complications. Preconception treatment of obesity with bariatric surgery reduces the risks of most pregnancy complications, but it increases the risk of having a baby measured in the smallest 10% (small-for-gestational-age, SGA). However, SGA is a poor indicator of fetal growth restriction (FGR), a condition where growth is impeded by a disease process. This distinction is important as FGR is associated with increased risks of neonatal complications, while most SGA infants are healthy. Whether preconception treatment with bariatric surgery is associated with increased odds of FGR is still unclear.
In this study, we will use a population database to evaluate the association between preconception bariatric surgery and the risk of FGR. Results of this study will be important to examine the balance between risks and benefits of preconception bariatric surgery in clinical care. Results will be diffused through scientific publications and presentations. Educational material, including infographic summaries and courses, will be created to disseminate findings to clinicians and patients.