TY - JOUR T1 - Use of SLP to identify disordered thoraco-abdominal breathing patterns in COPD JF - European Respiratory Journal JO - Eur Respir J VL - 44 IS - Suppl 58 SP - P1985 AU - Willem de Boer AU - Rachel Wilson AU - Amna Khalid AU - Richard Iles Y1 - 2014/09/01 UR - http://erj.ersjournals.com/content/44/Suppl_58/P1985.abstract N2 - The mechanism of breathing causes anterior movement of the thorax and abdomen. Increased resistance can change the phasing of these movements. Structured Light Plethysmography (SLP) is a non-invasive method of assessing thoraco-abdominal (TAA) movements during Tidal Breathing (TB). The movement of a projected grid of light records anterior displacement of the TAA region, from which complex time and movement based indices such as KM loops, and Breath Phase can be derived.Method: TAA movements were interrogated during 20-30 contiguous tidal breaths in adults with COPD and well individuals (normal). Data was collected as per Thora3di TM (PneumaCare Ltd) user manual. Datawas appraised to exclude whole upper body movement, drift, and noise. The following outputs were recorded: Thorax Relative Expired Contribution (%), IE50 ratio, Ti, Ti/Ttot ratio, and Breath Phase (degrees). The Mann-Whitney U test was performed to compare groups. 21 COPD (m=12, f=9), and 31 normal individuals (m=12, f=19) were studied.Results: Significance was seen for IE50 (p=0.001) and Phase (p=0.006). Thorax% and Ti/Ttot were not significant.Conclusion: Significant differences were observed between the TAA movements of COPD and normals. IE50 and breath phase were significant different in COPD patients. COPD patients and normal subjects demonstrate different TAA breathing patterns that can be identified using SLP. ER -