Abstract
The interrupter technique is one of the few lung function tests that can be used for assessment of airway calibre in small children. With this technique, measurements of the resistance of the respiratory system (Rint) can be carried out quickly, with minimal cooperation of the child. The aim of the present study was to measure expiratory interrupter resistance (Rint exp) before and after bronchodilator administration in small children with recurrent wheezing or/and asthma. 40 children under 5 years of age were evaluated using Micro Medical devices according to producer requirements. Baseline Rint values were significantly greater in children with atopic background than in nonatopic children. Significant change in resistance following bronchodilator was found in 30 children and was greater in children with doctor diagnosis asthma than in those with recurrent wheezing only but not asthma. The measurement of airways resistance by the interrupter technique is clinically meaningful following an intervention such as the administration of bronchodilator.
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