Aims There are a paucity of data on the association of duration of hypertension and blood pressure (BP) level with risk of ischaemic stroke in patients with atrial fibrillation (AF). Our objective was to investigate the association between duration of hypertension and secondly, BP levels with risk of ischaemic stroke among patients with AF. Methods and results A total of 246 459 oral anticoagulant-naïve non-valvular AF patients were enrolled from Korea National Health Insurance Service (NHIS) database (2005-2015). The risk of ischaemic stroke according to the duration of hypertension and systolic BP (SBP) levels were assessed. One-year increase of hypertension duration continuously increased the adjusted risk of ischaemic stroke (95% confidence interval 1.07-1.09) until 7 years, and reached a plateau with adjusted hazard ratio of 1.6. Risk of ischaemic stroke increased linearly with the increase of hypertension duration in patients younger than 65 years of age, whereas the risk reached a plateau in patients aged 65 years or older. In all baseline and pre-AF average SBP subgroups, longer duration of hypertension before AF was associated with higher ischaemic stroke risk than shorter duration of hypertension (all P-values for trends <0.01). However, the effect of long-term hypertension was not observed in patients with strictly well-controlled pre-AF average SBP of less than 120 mmHg. Conclusion The increase of hypertension duration was associated with the increased risk of ischaemic stroke. However, this long-term effect of hypertension duration can be attenuated by long-term strict SBP control throughout the entire duration of hypertension.
Bibliographical noteFunding Information:
This study was supported by a research grant from the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (NRF-2017R1A2B3003303), research grant from Development of Fundamental Technology Program through the National Research Foundation of Korea funded by Ministry of Science, Information and Communications Technology (ICT), & Future Planning (MSIP) (NRF-2017M3A9E8029724), and grants from the Korean Healthcare Technology Research and Development project funded by the Ministry of Health & Welfare (HI16C0058, HI15C1200). This research was supported by a grant from Abbott Laboratories.
All Science Journal Classification (ASJC) codes
- Cardiology and Cardiovascular Medicine