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Asthma is recognised as a heterogeneous disease and, within this heterogeneity, brittle asthma is identified as a distinct phenotype. Two types of brittle asthma have been recognised in adults: type 1, showing more than 40% diurnal variability in PEF rate on most days over long periods and type 2, with acute severe attacks on a background of apparently good asthma control. The exact incidence of these...
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