NY -- Standard&Poor's CreditWire 7/29/98 – Standard&Poor's today assigned its single-'A'-plus rating to North Carolina Medical Care Commission's $85 million revenue bonds series 1998, issued for Gaston Health Care Inc. The bonds are scheduled to sell Aug. 11, 1998. In addition, Standard&Poor's affirmed its single-'A'-plus rating to the commission's $59 million revenue bonds series 1995, also issued for Gaston Health Care Inc. The outlook has been revised to positive from stable. The rating reflects a dominant market position in the hospital's primary market, strong financial performance and liquidity, and historically good utilization. In addition, new service lines and cooperative strategies underscore management's ability to sustain strong financial performance in a changing market. The hospital