Heart specialists have filed suit against Secretary of Health and Human Services Kathleen Sebelius in an effort to stave off steep Medicare fee cuts for routine office-based procedures. The lawsuit, filed in U.S. District Court for the Southern District of Florida, charges that the government's planned cutbacks will deal a major blow to medical care and force thousands of cardiologists to shutter their offices, sell diagnostic equipment and work for hospitals, which charge more for the same procedures.