Values of the arterial blood gas and volumetric capnography variables in the groups with and without PE (n=205)

PE (n=68)No PE (n=137)
PaO2 kPa9.6±2.410.4±2.50.03
PaCO2 kPa4.4±0.74.6±0.70.01
VT mL694±303636±3050.20
RR breaths·min−118.9±5.917.9±5.90.23
PETCO2 kPa3.41±0.894.09±0.71<0.001
VDaw/VT %38.9±8.739.0±8.90.96
VCO2 mL·breath−113.4±7.014.9±9.10.24
Slope 3 kPa·L−11.94 (1.06–3.39)2.70 (1.54–5.24)0.001
PE-index mL422 (144–1048)146 (67–286)<0.001
Fdlate %0.73±45.7−15.2±34.1<0.001
AVDSf %22.1±14.111.3±9.90.01
CapNoPE Pa·min1.56±0.972.51±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).