NPPB and atrial fibrillation: A negative correlation exists between plasma NT-proBNP level and rLMC score (r = −0.156, P = 0.022), but a positive correlation exists between plasma NT-proBNP level and both CTP ischemic volume and CTP infarct core volume (r = 0.148, P = 0.003) in the AF group, but not in the non-AF group.