Values of the arterial blood gas and volumetric capnography variables in the groups with and without PE (n=205)
| Variable | Diagnosis | p-value# | |
| PE (n=68) | No PE (n=137) | ||
| PaO2 kPa | 9.6±2.4 | 10.4±2.5 | 0.03 |
| PaCO2 kPa | 4.4±0.7 | 4.6±0.7 | 0.01 |
| VT mL | 694±303 | 636±305 | 0.20 |
| RR breaths·min−1 | 18.9±5.9 | 17.9±5.9 | 0.23 |
| PETCO2 kPa | 3.41±0.89 | 4.09±0.71 | <0.001 |
| VDaw/VT % | 38.9±8.7 | 39.0±8.9 | 0.96 |
| VCO2 mL·breath−1 | 13.4±7.0 | 14.9±9.1 | 0.24 |
| Slope 3 kPa·L−1 | 1.94 (1.06–3.39) | 2.70 (1.54–5.24) | 0.001 |
| PE-index mL | 422 (144–1048) | 146 (67–286) | <0.001 |
| Fdlate % | 0.73±45.7 | −15.2±34.1 | <0.001 |
| AVDSf % | 22.1±14.1 | 11.3±9.9 | 0.01 |
| CapNoPE Pa·min | 1.56±0.97 | 2.51±1.67 | <0.001 |
Data are presented as mean±sd or median (interquartile range), unless otherwise stated. PE: pulmonary embolism; PaO2: arterial oxygen tension; PaCO2: arterial carbon dioxide tension; VT: tidal volume; RR: respiratory rate; PETCO2: end-tidal carbon dioxide tension; VDaw: anatomical dead-space volume; VCO2: carbon dioxide production; Fdlate: late dead-space fraction; AVDSf: alveolar dead-space fraction; CapNoPE: volumetric capnography parameter. #: p-values are for differences between subjects with and without PE. Values in bold are considered statistically significant (p<0.05).