A prominent Fort Lauderdale cardiologist at the center of a federal investigation into alleged Medicare and Medicaid fraud at Broward Health has signed a new contract featuring a hefty pay cut and an unfamiliar requirement that he treat poor people. Dr. Michael Chizner, chief medical director of tax-supported Broward Health's Heart Center of Excellence, signed the deal in December — weeks ahead of what was to be his scheduled termination date. The doctor ultimately signed, although his lawyer objected to the hospital's handling of his client. Broward Health previously announced Chizner would be dismissed on Jan. 2 for refusing to accept changes to his 10-year contract "in light of changes in the application or interpretation of laws and regulations…which now render your employment agreement illegal or unenforceable."