Temporal and age-related trends in risk factors for development of atrial fibrillation in peripartum patients

Abstract Background Incidence of atrial fibrillation (AF) in pregnancy has steadily increased over the past two decades and may be related to changes in rates of AF risk factors. Objective To characterize trends in the prevalence of AF risk factors among patients with peripartum AF. Methods TrinetX, a large national healthcare database, was used to identify patients with peripartum AF from 2017-2022. Inclusion criteria were female patients aged >18 years old who received a diagnosis of AF within one month prior to and one year after a diagnosis of pregnancy. Annual prevalence of pre-existing AF risk factors, including diabetes, chronic kidney disease (CKD), obesity, and hypertension, were obtained, normalized to the annual number of peripartum AF cases, and followed. In a second analysis, student’s t-test and standardized mean difference were used to compare the rates of AF risk factors between patients with peripartum AF and pregnant patients with no history of AF within the same time frame. Comparisons were performed across age ranges. Results From 2017-2022, there were 6,465 patients with peripartum AF and 2,852,348 pregnant patients with no AF. There was an increase in the proportion of peripartum AF patients with pre-existing obesity (16.7% to 18.5%) and hypertension (28.9% to 33.7%). In comparing pregnant patients with no AF history with peripartum AF patients, the standardized mean difference for rates of all risk factors increased with age group. The peripartum AF group had significantly higher rates of all risk factors across all age groups (p < 0.0001 for all groups). Conclusion Rates of pre-existing obesity and hypertension increased among patients with peripartum AF, which could be a factor in increasing rates of peripartum AF. Differences in rates of AF risk factors between peripartum AF patients and pregnant patients with no AF were more pronounced at older age groups.