Table 2

Classification of flow limitation (FL) into five categories according to fraction of control tidal volume (VT) encompassed by FL (FL % VT) and body position

CategorySupineSeatedDegree
0NFLNFLNone
1FL <50% VTNFLMild
2FL >50% VTNFLModerate
3FLFL <50% VTSevere
4FLFL >50% VTVery severe

  • Modified from 16