Table 1 |
||||
| Resistive loss coefficients (k) and equivalent linear resistances for air and helium/oxygen 78/22 for combinations of parabolic resistors used with the test lung | ||||
| R [cm H20 L-1s] | ||||
| k | Q[L/min] | Air | He/O278/22 | |
| Rp5 | 3.3 | 22.5 | 1.0 | 0.4 |
| 36.0 | 1.6 | 0.6 | ||
| 52.5 | 2.4 | 0.8 | ||
| Rp20 | 21.5 | 22.5 | 6.6 | 2.3 |
| 36.0 | 10.6 | 3.7 | ||
| 52.5 | 15.4 | 5.4 | ||
| 2xRp5 | 6.6 | 22.5 | 2.0 | 0.7 |
| 36.0 | 3.2 | 1.1 | ||
| 52.5 | 4.7 | 1.7 | ||
| Rp5 + Rp20 | 24.8 | 22.5 | 7.6 | 2.7 |
| 36.0 | 12.2 | 4.3 | ||
| 52.5 | 17.8 | 6.2 | ||
| 2xRp20 | 43.0 | 22.5 | 13.2 | 4.6 |
| 36.0 | 21.1 | 7.4 | ||
| 52.5 | 30.8 | 10.8 | ||
k is defined in the relationship
, where ΔP is the pressure loss across the resistor, ρ is the gas density, and Ū is the mean gas velocity entering the resistor.
Martin et al. BMC Pulmonary Medicine 2012 12:62 doi:10.1186/1471-2466-12-62
