18 Pillarisetti Pillarisetti J J Reddy Reddy N N Biria Biria M M Ryschon Ryschon K K Nagarajan Nagarajan D D Murray Murray C C Elevated Brain Natriuretic Peptide Level in Patients Undergoing Atrial Fibrillation Ablation: Is it a Predictor of Failed Ablation or a Mere Function of Atrial Rhythm and Rate at a Point in Time? The gene discussed is NPPB; the disease is atrial fibrillation.