Table 2—

Flow limitation detection in 12 chronic obstructive pulmonary disease patients using manual compression of the abdomen (MCA) or comparison of tidal and maximal expiratory flow/volume loops (maxV′/V)

SubjectResting breathing1/3 Wmax2/3 Wmax
No.MCAmaxV′/VMCAMaxV′/VMCAmaxV′/V
7+++++
8++++++
9+++++
10+++
11++++++
12++++++
13++++
14+++++
15
16++
17++++++
18+++
  • *: contradicts conventional (max V′/V) method

  • Wmax: maximal mechanical power output

  • +: flow limitation

  • −: no flow limitation