"The decrease is much greater than that observed with historical smoke and dust exposure and appeared to permanently reduce lung function," said Dr. Mark Gladwin, chief of Pulmonary, Allergy and Critical Care Medicine at the University of Pittsburgh Medical Center. "There was an expectation that this would improve in the overall cohort, but this did not happen."
However, doctors pointed out that the study did have a silver lining. Although the firefighters and EMTs did not recover during the study period, they didn't get worse after the first year.
"While recovery does not appear to have occurred to any significant degree, the good news is that after the original damage to lung function the rate of lung function loss returned to the normal range," said Dr. Neil Schachter, the medical director at the Respiratory Care Department at Mount Sinai Hospital in New York City.
"The event had not caused an accelerating loss of lung function, as has been the case with some exposures," he said.