Table 2. Laboratory parameters and their correlations with BNP levels.
| Parameters | Median (IQRs) values | Coefficient† | P value |
|---|---|---|---|
| WBC (/mm3) | 7,280 (5,750-10,295) | 0.002 | 0.985 |
| Hematocrit (%) | 44.0 (38.3-48.6) | 0.104 | 0.385 |
| Creatinine (mg/dL) | 0.8 (0.7-1.0) | - 0.067 | 0.583 |
| Albumin (g/dL) | 3.6 (3.3-3.8) | - 0.099 | 0.418 |
| Bilirubin (mg/dL) | 0.8 (0.5-1.2) | 0.279 | 0.020 |
| Troponin I (ng/mL) | 0.03 (0.02-0.06) | 0.558 | < 0.001 |
| [Na+] (mEq/L) | 139.0 (136.0-141.5) | - 0.140 | 0.253 |
| FVC% predicted (n = 56) | 57.0 (44.0-69.7) | 0.082 | 0.502 |
| FEV1% predicted (n = 56) | 39.0 (31.0-47.0) | 0.107 | 0.380 |
| PaCO2, mmHg | 56.9 (44.4-65.3) | 0.083 | 0.499 |
| PaO2, mmHg | 49.1 (38.2-67.1) | - 0.177 | 0.146 |
| RV systolic pressure, mmHg | 60.0 (49.5-70.3) | 0.082 | 0.505 |
| Delta BNP vs. delta RV systolic pressure* (n = 25) | - | 0.562 | 0.003 |
*Differences between admission and follow-up values; †Spearman's correlation test. BNP, brain natriuretic peptide; FVC, forced vital capacity; FEV1, forced expiratory volume in 1 sec; IQR, interquartile range; RV, right ventricle; WBC, white blood cell.