Table 3.
Correlation between IPVV and PFT.
| Pulmonary vascular measurement | Spirometry | |
|---|---|---|
| FEV1/FVC | FEV1% | |
| Inspiration | ||
| IPVVRUL | −0.289 (0.006) | −0.046 (0.666) |
| IPVVRML | −0.280 (0.008) | −0.246 (0.020) |
| IPVVRLL | −0.215 (0.043) | −0.062 (0.562) |
| IPVVLUL | −0.283 (0.007) | −0.094 (0.383) |
| IPVVLLL | −0.292 (0.005) | −0.230 (0.030) |
| Expiration | ||
| IPVVRUL | −0.318 (0.002) | −0.168 (0.117) |
| IPVVRML | −0.346 (0.001) | −0.360 (0.001) |
| IPVVRLL | −0.238 (0.024) | −0.202 (0.057) |
| IPVVLUL | −0.326 (0.002) | −0.243 (0.022) |
| IPVVLLL | −0.292 (0.005) | −0.297 (0.005) |
| Difference Value | ||
| IPVVRUL | 0.157 (0.143) | 0.393 (<0.001) |
| IPVVRML | 0.137 (0.202) | 0.353 (0.001) |
| IPVVRLL | 0.176 (0.099) | 0.338 (0.001) |
| IPVVLUL | 0.162 (0.130) | 0.406 (<0.001) |
| IPVVLLL | 0.173 (0.106) | 0.311 (0.003) |
| Relative Value | ||
| IPVVRUL | 0.200 (0.060) | 0.412 (<0.001) |
| IPVVRML | 0.211 (0.047) | 0.391 (<0.001) |
| IPVVRLL | 0.197 (0.064) | 0.367 (<0.001) |
| IPVVLUL | 0.226 (0.033) | 0.444 (<0.001) |
| IPVVLLL | 0.228 (0.032) | 0.359 (0.001) |
FEV1/FVC, ratio of forced expiratory volume in 1 s to forced vital capacity; FEV1, percentage predicted forced expiratory volume in 1 s; IPVV, the intrapulmonary vascular volume; All P-values were presented in parentheses.