Objective: To investigate the impact of atrial fibrillation (AF) on clinical outcomes in patients with acute ischemic stroke undergoing thrombolytic therapy.
Methods: The clinical data of 330 patients with acute ischemic stroke who received intravenous recombinant tissue plasminogen activator (rt-PA) therapy in the Second Affiliated Hospital, Zhejiang University School of Medicine between June 2009 and August 2013 were reviewed. Clinical outcomes in AF and non-AF groups were evaluated by univariate and multivariate analysis. Favorable outcome was defined as a modified Rankin Scale (mRS) 0-2 on day 90. Hemorrhagic transformation (HT) was classified as hemorrhagic infarction (HI) and parenchymal hematoma (PH) within the first 24h according to ECASS II criteria. Hypoperfusion and severe hypoperfusion were defined as Tmax >6 s and >8 s, respectively. The rate of reperfusion was compared between AF and non-AF groups.
Results: Among 330 patients, 137(41.5%) had AF. Compared with non-AF patients, patients with AF were older [(71.7±11.5)y vs (63.4±13.2)y, P<0.001], had higher baseline National Institutes of Health Stroke Scale [IQR, 13(8-16) vs 9(5-15), P<0.001], higher rate of HT(HI: 28.5% vs 17.1%, P=0.015; PH: 13.9% vs 4.1%, P=0.002), and lower rate of favorable outcome (41.5% vs 58.0%, P=0.005) at d 90. After adjustment, AF was not a risk factor for favorable outcome (OR=0.920, 95%CI:0.533-1.586; P=0.763) and mortality (OR=1.381, 95%CI:1.096-1.242; P=0.466) on day 90. AF was also not associated with HI (OR=1.676, 95%CI: 0.972-3.031; P=0.088), but it increased the rate of PH (OR=3.621, 95%CI: 1.403-9.344; P=0.008). Among 94 patients with pre- and post-thrombolytic perfusion-weighted image, AF was not associated with increased rate of reperfusion for hypoperfusion (Tmax >6 s, OR=1.12, 95%CI: 0.35-3.63, P=0.849), but was correlated with increased rate of reperfusion for severe hypoperfusion (Tmax>8 s, OR=10.57, 95%CI:1.16-96.50, P=0.037).
Conclusion: The presence of AF has no independent impact on neurological outcome in thrombolytic patients with acute ischemic stroke. It is associated with increased reperfusion rate of more severe hypoperfusion area and higher frequency of PH.
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| http://dx.doi.org/10.3785/j.issn.1008-9292.2014.01.020 | DOI Listing |
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