atrial fibrillation , atrial fibrillation atrial fibrillation atrial fibrillation atrial fibrillation http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001236/ atrial fibrillation http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001236/ a-fib a-fib A-Fib Information