RT Journal Article SR Electronic T1 Problematic severe asthma in children: A nationwide study in The Netherlands JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP P4567 VO 40 IS Suppl 56 A1 Annemie L.M. Boehmer A1 Liesbeth van Essen A1 Eric Duiverman A1 Johan de Jongste A1 Ad Bosschaart A1 Cindy Hugen A1 Eric-Jonas van de Griendt A1 Florens Versteegh A1 Bart van Ewijk A1 Anneke Landstra A1 Jeanette Dankert-Roelse A1 Karin de Winter A1 Hein Brackel A1 Anja Vaessen-Verberne A1 Marianne Brouwer A1 Govert Brinkhorst A1 Rein Jöbsis A1 The Dutch PSA Study Group YR 2012 UL http://erj.ersjournals.com/content/40/Suppl_56/P4567.abstract AB Introduction: Epidemiological data on problematic severe asthma in children are sparse. Methods: A 3 year (2008-2011), nationwide survey on PSA in children 4-18yrs old in the Netherlands through a national surveillance system among all paediatricians. Results: In this cross sectional study 328 children, aged 4-18yrs with PSA, were identified. A prevalence of at least 0.01% of children with asthma. PSA is more frequent in boys than in girls under 12yrs old. This sex ratio reverses >12yrs old. Eighty-five% had allergic asthma and in 85% symptoms started before they were 4yrs old. Investigations included lung function, FeNO, trials of steroids, chest radiographs, sweat tests, immunodiagnostics, HRCT, bronchoscopy in various percentages of patients. Over 10% had 5-13 exacerbations requiring prednisolon in the past year. ICU admittance in 11%. Fifty% had exacerbations with no symptoms in between, 40% suffered from very acute asthma attacks and 30% were continuously symptomatic. All despite up-to-date intensive surveillance and treatment. Seventy-five% received psycho diagnostics and 50% psychotherapy. FEV1 was normal in 85% of patients. Persistent airflow limitation in the past year was present in 13%. Daily prednisolon, omalizumab or antiTNFalfa was used in resp 5%, 1% and 0,08%. Conclusions: PSA in a country with a high standard medical system and coverage of medical cost for all, is rare. Asthma symptoms in children with PSA start <4yrs old. Children have severe symptoms despite intensive treatment and follow-up. Daily ICS doses are high with additional frequent oral steroids courses. Follow-up of this cohort into adulthood will yield the natural course of symptoms, lungfunction and psychosocial problems.