Tenet Healthcare Corp., the nation's third largest publicly traded hospital system, reported narrower losses and stronger foot traffic through its doors during the fourth quarter. For the fourth quarter that ended Dec. 31, Dallas-based Tenet reported losses of $33 million, or 7 cents per share, compared with losses of $75 million, or 16 cents per share, during the fourth quarter a year ago. For the quarter, Tenet reported revenue of $2.2 billion, up from $2 billion in the previous fourth quarter.