Table 2.
Model study: protocol A
| Parameter | Normal pattern | Restrictive pattern | Obstructive pattern | ||||||
| V' = 1 | V' = 0.8 | V' = 0.6 | V' = 1 | V' = 0.8 | V' = 0.6 | V' = 1 | V' = 0.8 | V' = 0.6 | |
| Large area | |||||||||
| Leakpause (ml) | 191 ± 7 | 196 ± 6 | 190 ± 4 | 190 ± 13 | 190 ± 15 | 190 ± 6 | 196 ± 5 | 185 ± 6 | 187 ± 6 |
| Leakconv (ml) | 298 ± 6 | 315 ± 3a | 339 ± 4ab | 303 ± 6 | 330 ± 2a | 358 ± 2ab | 308 ± 7 | 309 ± 5 | 320 ± 10ab |
| Small area | |||||||||
| Leakpause (ml) | 146 ± 2 | 135 ± 5 | 135 ± 4 | 147 ± 8 | 148 ± 12 | 137 ± 4 | 146 ± 9 | 139 ± 6 | 141 ± 11 |
| Leakconv (ml) | 239 ± 7 | 228 ± 3 | 244 ± 4ab | 249 ± 10 | 243 ± 4 | 269 ± 7ab | 243 ± 14 | 234 ± 4 | 254 ± 6ab |
Results are means ± SD. V', constant inspiratory flow (litre/s); Leakconv, cuff-leak volume measured when the cuff remained deflated during both inspiration and expiration; Leakpause, cuff-leak volume measured when the cuff was deflated at the end of 3 s of inspiratory pause.
aSignificantly different from the corresponding value at V'I = 1 litre/s.
bSignificantly different from the corresponding value at V'I = 0.8 litre/s.