Small airway dysfunction and flow and volume bronchodilator responsiveness in patients with chronic obstructive pulmonary disease

Roberta Pisi, Marina Aiello, Andrea Zanini, Panagiota Tzani, Davide Paleari, Emilio Marangio, Antonio Spanevello, Gabriele Nicolini, Alfredo Chetta

Research output: Contribution to journalArticlepeer-review

Abstract

Background: We investigated whether a relationship between small airways dysfunction and bronchodilator responsiveness exists in patients with chronic obstructive pulmonary disease (COPD). Methods: We studied 100 (20 female; mean age: 68±10 years) patients with COPD (forced expiratory volume in 1 second [FEV1]: 55% pred ±21%; FEV1/forced vital capacity [FVC]: 53%±10%) by impulse oscillometry system. Resistance at 5 Hz and 20 Hz (R5 and R20, in kPa·s·L-1) and the fall in resistance from 5 Hz to 20 Hz (R5 – R20) were used as indices of total, proximal, and peripheral airway resistance; reactance at 5 Hz (X5, in kPa·s·L-1) was also measured. Significant response to bronchodilator (salbutamol 400 µg) was expressed as absolute (≥0.2 L) and percentage (≥12%) change relative to the prebronchodilator value of FEV1 (flow responders, FRs) and FVC (volume responders, VRs). Results: Eighty out of 100 participants had R5 – R20 >0.03 kPa·s·L-1 (> upper normal limit) and, compared to patients with R5 – R20 ≤0.030 kPa·s·L-1, showed a poorer health status, lower values of FEV1, FVC, FEV1/FVC, and X5, along with higher values of residual volume/total lung capacity and R5 (P1.

Original languageEnglish
Pages (from-to)1191-1197
Number of pages7
JournalInternational Journal of COPD
Volume10
DOIs
Publication statusPublished - Jun 19 2015

Keywords

  • Bronchodilator responsiveness
  • COPD
  • Small airways

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Public Health, Environmental and Occupational Health
  • Health Policy

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