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Prognostic impact of hs-CRP and IL-6 in patients with persistent atrial fibrillation treated with electrical cardioversion

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OBJECTIVE: The aim of this study was to assess the role of inflammatory processes in the development of atrial fibrillation (AF) and the prognostic impact of inflammatory markers in predicting long-term risk of AF recurrence after electrical cardioversion (CV).

METHODS: High-sensitivity C-reactive protein (hs-CRP) and interleukin-6 (IL-6) were measured in 56 patients with persistent AF (lasting mean 128 days (range 14-960), mean age 65 years (34-84)), 19 healthy volunteers and 19 patients with permanent AF. Patients with persistent AF underwent CV. Blood samples were taken prior to CV and after 1, 30 and 180 days.

RESULTS: The immediate success rate of CV was 88%, while the total recurrence rate after 180 days was 68%. Patients with permanent AF had significantly higher levels of hs-CRP and IL-6 than patients with persistent AF (p = 0.0011, p<0.001). Patients in sinus rhythm (SR) after 180 days had significantly lower baseline hs-CRP (1.25 mg/L (0.5-2.4) versus 2.0 mg/L (0.9-3.3), p<0.001) and IL-6 (1.96 pg/mL (1.35-2.7) versus 2.75 pg/mL (1.55-3.62), p<0.001) than patients with recurrent AF. Baseline IL-6 was the only independent predictor of recurrent AF (p = 0.04) in a multivariate Cox analysis. Patients in the lowest hs-CRP quartile (<0.8 mg/L) had significantly lower AF recurrence rates after 180 days (50% versus 74% in the other three quartiles combined; p = 0.0069).

CONCLUSION: Patients with AF had elevated levels of inflammatory markers. Low hs-CRP and IL-6 prior to CV are associated with a lower risk of AF recurrence after CV.

OriginalsprogEngelsk
TidsskriftScandinavian Journal of Clinical and Laboratory Investigation
Vol/bind69
Udgave nummer3
Sider (fra-til)425-32
Antal sider8
ISSN0036-5513
DOI
StatusUdgivet - 2009

ID: 51560572