Objective: To determine the agreement between interrupter resistance (Rint) and airway resistance (Raw) by plethysmography in order to verify the clinical applicability of the interrupter technique. Methods: The Rint technique was performed with the patients in a sitting position, during exhalation, with a nose clip and cheek support. Plethysmography was carried out in accordance with standard protocols. All measurements were taken prior to and after the administration of an inhaled bronchodilator via a metered dose inhaler with a spacer. Results:The study comprised 99 consecutive patients referred to the Porto Alegre Hospital de Clínicas, located in the city of Porto Alegre, Brazil, for pulmonary function testing. Patient ages ranged from 18 to 82 years, and 52 of the patients were women. In the patients with FEV 1 ≥ 60% of predicted, there was good agreement between the methods (r = 0.8; intraclass correlation coefficient = 0.8). The Rint values were lower than were those of Raw by plethysmography in the patients with more severe disease. ResumoObjetivo: Determinar a concordância da medida da resistência das vias aéreas (RVA) pela técnica interrupter resistance (Rint, resistência do interruptor) com a do método pletismográfico para fins de aplicabilidade clínica. Métodos:A técnica Rint foi realizada com os pacientes em posição sentada, em expiração, utilizando clipe nasal e com suporte das bochechas. O exame pletismográfico foi realizado de acordo com protocolos padronizados. As medidas foram realizadas antes e após a administração inalatória de um broncodilatador via spray dosimetrado com espaçador.
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