TUCSON, Arizona, Oct. 28 (TNSjou) -- The University of Arizona issued the following news release: * * * University of Arizona engineers lead a research team that is developing a new kind of pacemaker, which envelops the heart and uses precise targeting capabilities to bypass pain receptors and reduce patient discomfort. * * * Atrial fibrillation - a form of irregular heartbeat, or arrhythmia - leads to more than 454,000 hospitalizations and nearly 160,000 deaths in the United States each yea  more