Arizona ranks No. 34 in the nation on a hospital safety report card issued by the Leapfrog Group. The ranking, released May 15, comes as Leapfrog found 161,000 avoidable deaths occur in hospitals nationwide each year. The report doesn't break out the number of avoidable hospital deaths by state, said Erica Mobley, director of operations for Leapfrog, a Washington, D.C.-based nonprofit representing the nation's largest and most influential employers and purchasers of health care. Mayo Clinic Hospital…