title: Thin-section CT in patients with severe acute respiratory syndrome following hospital discharge: preliminary experience.
abstract: OBJECTIVE
  To report the initial experience regarding thin-section computed tomographic (CT) findings in patients with severe acute respiratory syndrome (SARS) who improved clinically after treatment.
  
  
  METHODS
  Twenty-four patients (10 men, 14 women; mean age, 39 years; age range, 23-70 years) with confirmed SARS underwent follow-up thin-section CT of the thorax. The scans were obtained on average 36.5 days after hospital admission and were analyzed for parenchymal abnormality (ground-glass opacification, consolidation, or interstitial thickening) and evidence of fibrosis (parenchymal band, traction bronchiectasis, irregular interfaces). Patients were assigned to group 1 (with CT evidence of fibrosis) and group 2 (without CT evidence of fibrosis) for analysis. Patient demographics, length of hospital stay, rate of intensive care unit admission, peak lactate dehydrogenase level, pulsed intravenous methylprednisolone therapy, and peak opacification on chest radiographs were compared between the two groups.
  
  
  RESULTS
  Parenchymal abnormality was found in 96% (23 of 24) of patients and ranged from residual ground-glass opacification and interstitial thickening in group 2 (nine of 24, 38%) to fibrosis in group 1 (15 of 24, 62%). Patients in group 1 were older (mean age, 45 vs 30.3 years), had a higher rate of intensive care unit admission (27% [four of 15] vs 11% [one of nine]), more requirement for pulsed intravenous methylprednisolone (87%, [13 of 15] vs 67% [six of nine]), higher peak lactate dehydrogenase level (438.9 vs 355.6 U/L), and higher peak opacification on chest radiographs (estimated area, 14% vs 11%) than patients in group 2.
  
  
  CONCLUSIONS
  Pulmonary fibrosis may develop early in patients with SARS who have been discharged after treatment. Patients who are older and have more severe disease during treatment are more likely to develop thin-section CT findings of fibrosis.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Chinese University of Hong Kong, 30-32 Ngan Shing St, Shatin, Hong Kong SAR.
authors.forename: Gregory E
authors.initials: GE
authors.lastname: Antonio
authors.forename: K T
authors.initials: KT
authors.lastname: Wong
authors.forename: David S C
authors.initials: DS
authors.lastname: Hui
authors.forename: Alan
authors.initials: A
authors.lastname: Wu
authors.forename: Nelson
authors.initials: N
authors.lastname: Lee
authors.forename: Edmund H Y
authors.initials: EH
authors.lastname: Yuen
authors.forename: C B
authors.initials: CB
authors.lastname: Leung
authors.forename: T H
authors.initials: TH
authors.lastname: Rainer
authors.forename: Peter
authors.initials: P
authors.lastname: Cameron
authors.forename: Sydney S C
authors.initials: SS
authors.lastname: Chung
authors.forename: Joseph J Y
authors.initials: JJ
authors.lastname: Sung
authors.forename: Anil T
authors.initials: AT
authors.lastname: Ahuja
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007362:Intensive Care Units; D007770:L-Lactate Dehydrogenase / Q000097:blood; D007902:Length of Stay; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D008775:Methylprednisolone / Q000008:administration & dosage; D008875:Middle Aged; D010351:Patient Discharge; D011658:Pulmonary Fibrosis / Q000000981:diagnostic imaging; D045169:Severe Acute Respiratory Syndrome / Q000532:radiotherapy*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D007770:L-Lactate Dehydrogenase; D008775:Methylprednisolone