Increased Cardiac Arrhythmia After Pregnancy-Induced Hypertension: A South Korean Nationwide Database Study

• Published in: Journal of the American Heart Association Vol. 11; no. 2; p. e023013
• Main Authors: Park, Yoonjee, Cho, Geum Joon, Roh, Seung-Young, Na, Jin Oh, Oh, Min-Jeong
• Format: Journal Article
• Language: English
• Published: England John Wiley and Sons Inc 18.01.2022; Wiley
• Subjects: Arrhythmias, Cardiac - complications; Arrhythmias, Cardiac - epidemiology; atrial fibrillation; cardiac arrhythmia; Cesarean Section; Female; Humans; Hypertension - epidemiology; Hypertension, Pregnancy-Induced - epidemiology; hypertensive disorders of pregnancy; JAHA Spotlight on Pregnancy and its Impact on Maternal and Offspring Cardiovascular Health; Magnesium Sulfate; Original Research; preeclampsia; Pregnancy; Risk Factors; atrial fibrillation; preeclampsia; cardiac arrhythmia; hypertensive disorders of pregnancy
• DOI: 10.1161/JAHA.121.023013
• ISSN: 2047-9980

Background Although pregnancy-induced hypertension (PIH) is associated with an elevated cardiovascular risk, long-term studies or prepregnancy baseline data are scarce. Therefore, using a large nationwide cohort with prepregnancy periodic health screening data, we investigated whether clinically significant arrhythmia incidence increases after PIH. Methods and Results Data were extracted from the Korea National Health Insurance database and combined with the National Health Screening Examination database; women who gave birth between 2007 and 2015 and underwent the national health screening test within a year before pregnancy were followed up until 2016. We excluded women who had a diagnosis of arrhythmia within 1 year before pregnancy. The primary outcome was significant arrhythmia during the year after delivery. Secondary analysis included only specific diagnostic codes of arrhythmia with clinical significance. Additionally, the risk of arrhythmia was stratified by the use of magnesium sulfate. Of 2 035 684 women (PIH; n=37 297 versus normotensive pregnancy; n=1 998 387), the PIH group had a higher prepregnancy risk profile and showed a higher incidence of arrhythmia than women with normotensive pregnancies within 1 year. Women with PIH had a significantly higher risk of atrial flutter/fibrillation and atrioventricular block, but not lethal arrhythmias. Other predictors of arrhythmia development included advanced maternal age and cesarean section. Stratified analysis showed a higher risk of arrhythmia with magnesium sulfate use. Conclusions PIH was significantly associated with the development of arrhythmia within 1 year after delivery. Nevertheless, the incidence of lethal arrhythmias was not increased by PIH. Arrhythmia, especially atrial fibrillation, may largely contribute to increasing the future cardiovascular risk in women with a PIH history.