Childhood idiopathic thrombocytopenic purpura in the Nordic countries: epidemiology and predictors of chronic disease
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Jonsson, Olafur G
Henter, Jan Inge
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CitationActa Paediatr. 2005, 94(2):178-84
AbstractAIM: To describe the epidemiology of idiopathic thrombocytopenic purpura (ITP) in the Nordic countries, to define clinical subgroups and to investigate factors predicting chronic disease. METHODS: A prospective registration was done from 1998 to 2000, including all children with newly diagnosed ITP aged 0-14 y and at least one platelet count <30 x 10(9)/l. RESULTS: 506 children were registered and 423 followed for 6 mo. The incidence was 4.8/10(5) per year. Most children were aged 0-7 y (78%), with a predominance of boys, while patients aged 8-14 y had equal representation of the two sexes. There were seasonal variations determined by variations in postinfectious cases with sudden onset. The platelet count was <10 x 10(9)/l in 58%, but bleeding manifestations were mild or moderate in 97%. The insidious form (symptoms for more than 2 wk) was more frequent in older children and girls, showed little seasonal variation, had milder manifestations and ran a chronic course in more than half the cases. Intracranial haemorrhages did not occur in the first 6 mo after diagnosis. Chronic ITP developed in 25%. The strongest predictor of chronic disease was insidious onset of symptoms (OR 5.97). CONCLUSION: In the Nordic countries, ITP mainly affects children aged 0-7 y, with a winter bulk of postinfectious cases superimposed on a steady occurrence of non-infectious cases. Clinically, it may be useful to distinguish between children with sudden versus insidious onset of symptoms rather than between different age groups.
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