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Abstract

Autoimmune response in mothers of children with congenital and postnatally diagnosed isolated heart block: a population based study.

Heikki Julkunen, Aaro Miettinen, Timo K Walle, Edward K L Chan and Marianne Eronen
The Journal of Rheumatology January 2004, 31 (1) 183-189;
Heikki Julkunen
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Aaro Miettinen
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Timo K Walle
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Edward K L Chan
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Marianne Eronen
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Abstract

OBJECTIVE: To study the autoimmune response in mothers of children with isolated congenital heart block (CHB) and heart block (HB) diagnosed postnatally. METHODS: We reviewed the Finnish hospital registries for patients born between 1950 and 2000 and diagnosed with isolated HB before the age of 16 years. Clinical data and sera for the determination of autoantibodies were available from 67 mothers of children with CHB and from 37 mothers of children with postnatally diagnosed HB 9.9 years and 22.6 years (mean) after the index delivery, respectively. Maternal antibodies to 52 kDa and 60 kDa SSA and 48 kDa SSB were determined by time-resolved fluoroimmunoassay (TR-FIA) and by immunoblotting. Other marker antibodies for connective tissue diseases (CTD) were determined by immunoblot and/or by immunofluorescence. The control group comprised 136 mothers with primary Sjögren's syndrome (SS), systemic lupus erythematosus (SLE), or other CTD with healthy children. RESULTS: Sixty of our 67 mothers (90%) of children with CHB had antibodies to SSA or SSB by the methods initially used in this study. When retests and tests performed previously were taken into account, only 3 (4%) of the 67 mothers did not have any autoantibodies. Two (3%) of the 67 mothers had antibodies to dsDNA and one (1%) each to Jo-1/HRS, RNP-70 kDa, and histone proteins. Of 37 mothers of children with postnatally diagnosed HB, only 3 (8%) had any autoantibodies. Increased risk of having a child with CHB was indicated by maternal primary SS and high levels of anti-SSA and anti-SSB by all assays, whereas low risk was indicated by maternal SLE or other CTD and undetectable or low levels of the antibodies. No single anti-SSA or anti-SSB test was clearly superior to others, but in general, immunoblots were more specific than TR-FIA. CONCLUSION: Maternal autoimmune disorder is almost always associated with CHB but only rarely with postnatally diagnosed HB. Anti-SSA and anti-SSB are marker antibodies for mothers of children with CHB, and an increased risk of having an affected child is indicated by maternal primary SS and high titer antibodies to SSA and SSB.

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The Journal of Rheumatology
Vol. 31, Issue 1
1 Jan 2004
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Autoimmune response in mothers of children with congenital and postnatally diagnosed isolated heart block: a population based study.
Heikki Julkunen, Aaro Miettinen, Timo K Walle, Edward K L Chan, Marianne Eronen
The Journal of Rheumatology Jan 2004, 31 (1) 183-189;

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Autoimmune response in mothers of children with congenital and postnatally diagnosed isolated heart block: a population based study.
Heikki Julkunen, Aaro Miettinen, Timo K Walle, Edward K L Chan, Marianne Eronen
The Journal of Rheumatology Jan 2004, 31 (1) 183-189;
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