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Neurology. 2013 May 14;80(20):1834-40. doi: 10.1212/WNL.0b013e318292a330. Epub 2013 Apr 17.

Newly diagnosed atrial fibrillation linked to wake-up stroke and TIA: hypothetical implications.

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1
Stroke Center at the Institute of Neurosciences, University Hospital, Favaloro Foundation, Buenos Aires, Argentina.

Abstract

BACKGROUND:

Based on the higher frequency of paroxysmal atrial fibrillation during night and early morning hours, we sought to analyze the association between newly diagnosed atrial fibrillation and wake-up ischemic cerebrovascular events.

METHODS:

We prospectively assessed every acute ischemic stroke and TIA patient admitted to our hospital between 2008 and 2011. We used a forward step-by-step multiple logistic regression analysis to assess the relationship between newly diagnosed atrial fibrillation and wake-up ischemic stroke or TIA, after adjusting for significant covariates.

RESULTS:

The study population comprised 356 patients, 274 (77.0%) with a diagnosis of acute ischemic stroke and 82 (23.0%) with TIA. A total of 41 (11.5%) of these events occurred during night sleep. A newly diagnosed atrial fibrillation was detected in 27 patients of 272 without known atrial fibrillation (9.9%). We found an independent association between newly diagnosed atrial fibrillation and wake-up ischemic stroke and TIA (odds ratio 3.6, 95% confidence interval 1.2-7.7, p = 0.019).

CONCLUSIONS:

The odds of detecting a newly diagnosed atrial fibrillation were 3-fold higher among wake-up cerebrovascular events than among non-wake-up events. The significance of this independent association between newly diagnosed atrial fibrillation and wake-up ischemic stroke and TIA and the role of other comorbidities should be investigated in future studies.

PMID:
23596075
DOI:
10.1212/WNL.0b013e318292a330
[Indexed for MEDLINE]
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