title: Alteration of lung diffusion capacity in IgA nephropathy.
abstract: OBJECTIVE
  To establish whether changes of lung transfer for carbon monoxide (TLCO) are related to the phase of IgA nephropathy.
  
  
  METHODS
  Respiratory function was tested in 12 children with IgA nephropathy assessed by percutaneous renal biopsy. This was done during acute exacerbations or haematuria-free phases of the disease.
  
  
  RESULTS
  TLCO was low in 12/13 measurements made in the haematuric phase of IgA nephropathy or during the month following gross haematuria (mean TLCO 64% of expected values). Lung volumes and blood gas values were normal and only minor radiological signs of interstial lung involvement were observed in 11/12 patients. When respiratory tests were performed more than three months after gross haematuria, TLCO was low in 4/9 patients, with no relation to the significance of residual proteinuria or severity of findings at renal biopsy. There was a significant difference between tests performed when haematuria was present or recent and those performed more than three months after an episode of gross haematuria (p < 0.01).
  
  
  CONCLUSIONS
  The decrease of TLCO in the acute phases of the disease is probably related to alterations of the lung alveolarcapillary membrane by immune complexes containing IgA. This non-invasive technique, easy to perform and repeat, could be of value in the diagnosis of IgA nephropathy in haematuric children.
authors.affiliation: Department of Paediatrics, Hôpital Saint Vincent de Paul, Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Ravilly
authors.forename: M
authors.initials: M
authors.lastname: Chaussain
authors.forename: J L
authors.initials: JL
authors.lastname: Iniguez
authors.forename: A
authors.initials: A
authors.lastname: Lenhert
authors.forename: G
authors.initials: G
authors.lastname: Kalifa
authors.forename: P
authors.initials: P
authors.lastname: Brun
authors.forename: P
authors.initials: P
authors.lastname: Niaudet
authors.forename: D
authors.initials: D
authors.lastname: Gendrel
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D002248:Carbon Monoxide / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005652:Functional Residual Capacity; D005922:Glomerulonephritis, IGA / Q000150:complications / Q000175:diagnosis / Q000378:metabolism*; D006417:Hematuria / Q000209:etiology / Q000378:metabolism; D006801:Humans; D008168:Lung / Q000378:metabolism*; D008297:Male; D011446:Prospective Studies
chemical_list: D002248:Carbon Monoxide