Increased inflammatory cell infiltration in the atrial myocardium of patients with atrial fibrillation

The American Journal of Cardiology
Mien-Cheng ChenKuo-Li Pan

Abstract

Atrial fibrillation (AF) may be caused by structural and electrophysiological changes in the atria induced by inflammation. This study analyzed 35 adult patients with symptomatic severe mitral valve disease and moderate-to-severe tricuspid valve disease and without coronary artery disease who underwent valve operations for congestive heart failure; 18 patients had persistent AF and 17 patients had no history or electrocardiogram examination of AF before surgery. Atrial appendageal tissues obtained during surgery were evaluated for histopathological changes. The number of inflammatory cells identified as CD45-positive cells in the right atrial myocardium in the AF group (7.5 +/- 7.5 cells per high power field) was significantly higher than that of normal controls (2.7 +/- 1.5 cells per high power field, p = 0.0018). The number of inflammatory cells in the right atrial myocardium did not differ between the sinus group and normal controls (2.7 +/- 1.5 vs 2.6 +/- 2.2 cells per high power field, p >0.05). Additionally, the number of inflammatory cells in the atrial myocardium did not differ between the right and left atria in patients with AF (7.5 +/- 7.5 cells per high power field for right atria vs 7.1 +/- 4.2 cells per high power...Continue Reading

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