John McCabe, Katie Harris, Sarah Gorey, Cathal Walsh, Markus Arnold, Gian Marco De Marchis, Pablo Hervella, Ramón Iglesias‐Rey, Christina Jern, Mira Katan, Linxin Li, Nobukazu Miyamoto, Joan Montaner, Francisco Purroy, Peter M. Rothwell, Tara M Stanne, Cathie L.M. Sudlow, Yuji UENO, Mikel Vicente-Pascual, Will N. Whiteley, Mark Woodward, P A Kelly
BACKGROUND AND OBJECTIVES: The residual recurrence risk after atrial fibrillation (AF)-related stroke is high despite anticoagulation, thereby necessitating new therapies. The importance of inflammation in AF is increasingly recognized. However, patients with AF-related stroke were excluded from recent trials of anti-inflammatory therapies. It is uncertain whether associations between IL-6/high-sensitivity C-reactive protein (hsCRP) and poststroke recurrence are modified by AF status. In this study, we aimed to analyze the association between IL-6/hsCRP and recurrence according to AF history. METHODS: We leveraged individual participant data from studies identified by systematic review. We analyzed associations between IL-6/hsCRP and recurrent stroke/major adverse cardiovascular events (MACEs) (defined as fatal or nonfatal recurrent stroke or major coronary events) using multivariable Cox regression analyses (conditional logistic regression for 1 study) adjusted for age, sex, index event, cardiovascular risk factors, and medication use, stratified by AF status. RESULTS: unit for MACE was 1.17 (1.07-1.27) in patients without AF and 1.10 (0.91-1.34) in those with AF. The corresponding aRR for recurrent stroke was 1.15 (1.05-1.25) and 1.12 (0.91-1.37) in patients without and with AF, respectively. DISCUSSION: These data highlight the importance of inflammatory mechanisms in vascular recurrence irrespective of AF, provide rationale for the inclusion of patients with AF in trials of anti-inflammatory therapy, and support a selection approach in future trials based on elevated inflammatory marker levels, rather than stroke etiology alone.