Abstract Background European guidelines on AF management recommend a systolic blood pressure (SBP) target of 120–129 mmHg as this level is associated with the lowest risk of poor outcomes. Elevated blood pressure and AF both negatively affect renal function, but the interactions between SBP and renal function in patients with AF remains unclear. In the UK extension of the EURObservational Research Programme (EORP) Long-term Registry of patients with atrial fibrillation (AF) [AF-GEN-UK study], we assessed the combined impact of BP levels and renal (dys)function on mortality, thromboembolic and haemorrhagic events. Methods 1580 patients (60.1% males, mean (SD) age 70.6 (11.2) years) from the AF-GEN-UK registry had SBP available at baseline and were stratified into groups based on SBP: 120–129 mmHg (reference group, n=289), <100 mmHg (n=165), 110–119 mmHg, (n=254), 130–139 mmHg (n=321), 140–159 mmHg (n=385), and ≥160 mmHg (n=166). Impact of SBP, renal function and their interaction on 1-year outcomes were assessed using Cox regression analysis, adjusted for age, oral anticoagulation (OAC) use and CHA2DS2-VASc score. SBP groups were compared by ANOVA (continuous data) and Chi-square test (categories) with two tailed p<0.05 deemed significant (STATA Corp, version 13). Results Overall OAC use was 84% and was similar between all SBP groups. Renal function (eGFR), was preserved across SBP groups; those with SBP 110–119 mmHg had the lowest level. Prevalence of heart failure was highest in those with SBP <110 mmHg. Patients with uncontrolled SBP (>140 mmHg) were older, more likely female and higher rates of hypertension, with correspondingly higher CHA2DS2VASc scores. SBP <100 mmHg (Hazard Ratio (HR) 2.36; 95% confidence intervals (CI) 1.20–4.64) and lower eGFR (HR 0.99; 95% CI 0.98–0.996) were associated with all cause-death in univariate analyses. Adjusted Cox regression revealed that SBP <100 mmHg and OAC use were independent predictors of all-cause death (Table). No interaction between BP groups and eGFR was evident. OAC use (aHR 0.31; 95% CI 0.11–0.92) was associated with a reduced risk of thromboembolic events. Conclusion In anticoagulated patients with AF, SBP <110 mmHg was independently predicted of all-cause death, with no interaction with kidney function. No independent association of SBP groups with haemorrhagic and thromboembolic events was evident. OAC therapy was associated with a significant reduction in all-cause death and thromboembolic events. Funding Acknowledgement Type of funding sources: Private company. Main funding source(s): This project was supported by the BMS/Pfizer European Thrombosis Investigator Initiated Research Program
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