The morning after President Obama had been re-elected, investors gobbled up shares of hospital chains, including the four headquartered in Middle Tennessee. But HCA, Community Health Systems, LifePoint and Vanguard Health have since been nothing but a source of indigestion. Market leader HCA is down more than 11 percent, and the three other companies have lost more ground than the S&P 500 since the end of the day Nov. 7. Word that one prominent hedge fund dumped its HCA holdings in the third quarter won't do much to help short-term investor sentiment — even if the consensus remains that the implementation of health reform will be a positive for these companies over the long haul.