Federal regulators are reviewing the preliminary findings of a crucial government survey of Parkland Memorial Hospital after inspectors spent only five days at the Dallas County public facility. The team of 17 government surveyors had been expected to spend two consecutive weeks reviewing upgrades to Parkland, which has been under intense pressure to improve patient safety measures. The changes have consumed the past 18 months and cost the hospital an estimated $75 million. Although previous government surveys at Parkland have been continuous, the latest inspection apparently will be spread over more than one visit, officials said. The surveyors arrived at Parkland on June 17 to determine whether the hospital changes were extensive enough to allow it to retain its government funding.