Registered nurses, members of the National Nurses Organizing Committee-Texas/National Nurses United -- the largest professional association and union of registered nurses in the country, with 170,000 members -- will hold a press conference outside Bay Area Medical Center/The Heart Hospital on Thursday, October 6th from Noon-1p to call attention to staffing issues and patient care protection at Corpus Christi Medical Center (CCMC). There are 520 RNs on staff at CCMC.