Association between preeclampsia and long-term risk of arrhythmias

Abstract Background Preeclampsia (PE), a pregnancy-induced hypertensive disorder, affects 4-5% of pregnancies worldwide. It is well known that hypertension is associated with increased risk of arrhythmias; however, data on the association between PE and arrhythmias are sparse and there is a lack of knowledge on the long-term risk of arrhythmias. Purpose To compare the incidence of arrhythmias following preeclamptic and normotensive pregnancies. Methods In this observational cohort study, we identified all primiparous women without history of arrhythmias who gave birth in Denmark from 1997 to 2016 using Danish nationwide registries. The women were stratified on whether they developed PE during their primiparous pregnancy and were followed from primiparous pregnancy to incident arrhythmia, emigration, death, or end of study (December 31, 2018). The comparative risks of arrhythmias were assessed in cause-specific Cox regression analyses adjusted for known arrhythmogenic risk factors including obesity, smoking, hypertension, coronary artery disease, cardiomyopathy, congenital heart disease, thyroid disease, diabetes, and alcohol abuse. Results A total of 521,517 primiparous women with a median age of 28 years were included and 23,523 (4.5%) were diagnosed with PE. Women with versus without PE were of similar age but had a higher burden of comorbidities. During a median follow-up period of 10.2 years, women with PE were associated with higher absolute incidences of arrhythmias (Figure 1). No statistically significant association was found for the composite of cardiac arrest, ventricular arrhythmias, or ICD-implantation nor for the composite of advanced 2nd or 3rd degree atrioventricular block, sinoatrial dysfunction, or pacemaker-implantation. However, women with PE were associated with a significant increased risk of the composite of supraventricular tachyarrhythmias and extrasystoles (p<0.01) and the composite of all included arrhythmias (p<0.01). Factors associated with arrhythmias among women with PE included obesity (HR 1.40 (95%CI 1.03-1.91), coronary artery disease (HR 2.39 (95%CI 1.14-5.00), cardiomyopathy (HR 9.65 (95%CI 3.46-26.92), and congenital heart disease (HR 5.86 (95%CI 2.59-13.28). Conclusion Preeclamptic women were associated with a significantly higher rate of arrhythmias - mainly driven by supraventricular tachyarrhythmias and extrasystoles - than normotensive women. For the purpose of primary and secondary prevention, this finding suggests that women with a history of PE may benefit from evaluation of cardiovascular risk factors, screening of and education in prevention of cardiovascular disease.Figure 1