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[Correlations between the prick test and aspecific bronchial reactivity in atopic patients].

Aspecific bronchial provocation test with Methacholine plays an outstanding role in the diagnostic routine of asthmatic disease, in order to accomplish a correct interpretation of the relation between A.B.I. and bronchial asthma. All researches give a special prominence to the bronchial reactivity distribution among the population, and point out that the distribution curve of response to aspecific challenge shows itself as an unimodal curve, since there is no clinic group (neither that one including subjects defined asthmatic from a clinic or anamnestic point of view) which clearly separates from the rest. A further important consideration indicates that a positive response to the test is not specific of bronchial asthmatic subjects, but it can also occur in patients affected with other pathologies such as chronic bronchitis, allergic rhinitis, and so on. Our study aimed, therefore, to evaluate the correlations occurring between skin sensitivity and aspecific bronchial reactivity in 5 groups of atopic patients (affected with: (1) asthma; (2) asthma + rhinitis; (3) asthma + rhinitis + conjunctivitis; (4) rhinitis + conjunctivitis; (5) rhinitis). In doing such correlations we also considered some other factors like sex, smoking habit, town or country provenance. Sensitiveness, specificity, and predicting value of Prick-test in comparison with Methacholine test have been analysed as well. The results so obtained show that no correlation occurs between Prick-test and Aspecific Bronchial Test in the groups of tested subjects. Test sensitiveness increases in the groups of patients affected with associated pathologies, and depends on factors like sex, smoking habit, town or country provenance.