CANTON — Keeping up with rising demand is on the docket for three of the county’s major health systems. NORTHSIDE HOSPITAL-CHEROKEE For 2012, Northside Hospital-Cherokee plans to complete its renovations and expansions of its emergency department. The hospital is adding more observational beds on the first floor of its ER to keep up with increased volume, said Russ Davis, Northside Hospital’s director of marketing and public relations. Davis also said the hospital will observe its 50th anniversary in April and will soon begin planning the celebrations. In 2011, the Canton hospital received 94,750 patients, had 34,600 ER visits,...