S19-295 Antibody-Based Delivery of Imaging Probe or Small Molecule Drug to Cardiac Conduction System Heart rhythm disorders are difficult to treat with conventional drug therapy and intraoperative injury to the cardiac conduction system (CCS) complicates heart-related surgeries and is a major cause of morbidity and mortality. Sean Wu Eben Rosenthal William Goodyer Benjamin Beyersdorf Nynke Sjoerdtje van den Berg