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[The prevalence of orthostatic dysregulation complicated with bronchial asthma].

Orthostatic dysregulation (OD) has been reported to be complicated with childhood bronchial asthma. 42 patients (28 females and 14 males) with adult-onset bronchial asthma were selected randomly to investigate the prevalence of OD. OD was diagnosed by both questionnaire for subjective symptoms and tilting test (Schellong test and upright ECG). Our results revealed that 64.3% (both 64.3% in females and males) of the patients were complicated with OD. There was no significant difference in the duration of asthma, FEV0.1, %FEV1.0, serum IgE level, and severity of asthma between patients with OD and without OD. Furthermore, no significant difference in the results of tilting test were observed. In serum level of theophylline we couldn't detect any subjective difference between the two groups, however there was significant difference between positive patients and negative patients in tilting test. In conclusion, OD is frequently complicated with adult-onset asthma and we should be careful of the subjective symptoms concerned with OD.