Myocardial perfusion is impaired and relates to cardiac dysfunction in patients with atrial fibrillation both before and after successful catheter ablation by Wijesurendra, R, Liu, A, Notaristefano, F, Ntusi, N, Karamitsos, T, Bashir, Y, Ginks, M, Rajappan, K, Betts, T, Jerosch-Herold, M, Ferreira, V, Neubauer, S, Casadei, B