AI Article Synopsis
- The study examines whether patients with atrial fibrillation known before ischemic stroke (KAF) have a higher recurrence risk compared to those diagnosed after stroke (AFDAS), considering factors like previous anticoagulation treatment.
- Data from 4,357 patients showed that pre-existing anticoagulation significantly influenced stroke recurrence risk, while KAF did not demonstrate an independent association with risk.
- The results suggest that KAF and AFDAS may not be as distinct in terms of stroke recurrence risk as previously thought, emphasizing the need for future research on stroke causes despite anticoagulation.
Article Abstract
Background: Atrial fibrillation (AF) known before ischemic stroke (KAF) has been postulated to be an independent category with a recurrence risk higher than that of AF detected after stroke (AFDAS). However, it is unknown whether this risk difference is confounded by pre-existing anticoagulation, which is most common in KAF and also indicates a high ischemic stroke recurrence risk.
Methods: Individual patient data analysis from 5 prospective cohorts of anticoagulated patients following AF-associated ischemic stroke. We compared the primary (ischemic stroke recurrence) and secondary outcome (all-cause death) among patients with AFDAS versus KAF and among anticoagulation-naïve versus previously anticoagulated patients using multivariable Cox, Fine-Gray models, and goodness-of-fit statistics to investigate the relative independent prognostic importance of AF-category and pre-existing anticoagulation.
Results: Of 4,357 patients, 1,889 (43%) had AFDAS and 2,468 (57%) had KAF, while 3,105 (71%) were anticoagulation-naïve before stroke and 1,252 (29%) were previously anticoagulated. During 6,071 patient-years of follow-up, we observed 244 recurrent strokes and 661 deaths. Only pre-existing anticoagulation (but not KAF) was independently associated with a higher hazard for stroke recurrence in both Cox and Fine-Gray models. Models incorporating pre-existing anticoagulation showed better fit than those with AF category; adding AF-category did not result in better model fit. Neither pre-existing anticoagulation nor KAF were independently associated with death.
Conclusion: Our findings challenge the notion that KAF and AFDAS are clinically relevant and distinct prognostic entities. Instead of attributing an independently high stroke recurrence risk to KAF, future research should focus on the causes of stroke despite anticoagulation to develop improved preventive treatments. ANN NEUROL 2023;94:43-54.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10953352 | PMC |
| http://dx.doi.org/10.1002/ana.26654 | DOI Listing |
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