@article {Tsep923, author = {Hoi Nam Tse and King Ying Wong and Ka Yan Wai and Kwok Sang Yee}, title = {The use of forced oscillation technique (FOT) in assessment of airway obstruction and airtrapping in elderly COPD patients}, volume = {38}, number = {Suppl 55}, elocation-id = {p923}, year = {2011}, publisher = {European Respiratory Society}, abstract = {Introduction: Forced oscillation technique (FOT) is a new lung function measurement technique that may have a role in assessing elderly COPD patients.Aim: To evaluate the accuracy of FOT in assessment of airway obstruction and airtrapping in elderly COPD patients.Methods: Stable spirometry-confirmed elderly COPD subjects were recruited from Kwong Wah Hospital, Hong Kong from Jan 10 to Jan 11.Subjects were assessed by both conventional plethysmography and FOT machine in the same visit. Airway obstruction was measured by FEV1\%, Raw, Gaw while degree of airtrapping was measured by residual volume (RV), total lung capacity (TLC), inspiratory capacity (IC) and RV/TLC ratio. FOT parameters like frequency resonance (FRes), frequency dependence (FDep), resistance at 6Hz (R6Hz), average resistance (RAvr), average reactance (XAvr) were obtained. The FOT parameters were then compared with the plethysmography.Results: Totally, 106 patients were recruited. 93.1\% were male with a mean age of 70.6{\textpm}8.3 and FEV1 of 54.3{\textpm}21.3. FOT correlates well with conventional plethysmography for measurement of airway resistance and airtrapping in elderly COPD patients. Among the FOT parameters, FRes showed the best correlation with FEV1 (r=0.608, p\<0.001) and RV/TLC ratio (r=0.563, p\<0.001).Conclusion: FOT is an accurate and convenient technique for assessment of airway obstruction and airtrapping in elderly COPD patients.}, issn = {0903-1936}, URL = {https://erj.ersjournals.com/content/38/Suppl_55/p923}, eprint = {https://erj.ersjournals.com/content}, journal = {European Respiratory Journal} }