Pulmonary Hemodynamics and Six-Minute Walk Test Outcomes in Patients with Interstitial Lung Disease

Table 2

Pulmonary function, arterial gas analysis, hemodynamics, and 6 min walk test outcomes.

Variables	Mean ± SD	Range
Pulmonary function
FVC, L	2.3 ± 0.8	0.9–4.4
FVC, % predicted	76.7 ± 17.1	41.5–122.0
DLco, mL/min/mmHg	10.1 ± 3.2	4.8–17.0
DLco, % predicted	62.9 ± 16.0	37.8–118.1
Arterial gas analysis
PaO2, mmHg	76.6 ± 10.6	58.0–101.7
PaCO2, mmHg	40.6 ± 4.4	31.1–48.8
pH	7.41 ± 0.02	7.38–7.47
Hemodynamics
Mean AP, mmHg	91.3 ± 12.3	66.6–114.0
RAP, mmHg	2.9 ± 2.8	0.4–8.1
Mean PAP, mmHg	16.6 ± 4.8	7.0–27.0
PCWP, mmHg	6.5 ± 3.3	0–15.0
CO, L/min	4.7 ± 1.1	3.0–8.0
Cardiac index, L/min/m^2	3.0 ± 0.6	1.8–4.6
PVR, dyne⋅s/cm^5	177 ± 81	0–342
6MWT outcomes
Walk distance, m	394 ± 102	120–580
SpO2 at end of the test, %	85.4 ± 8.3	62–97
Dyspnea at end of the test	3.7 ± 2.6	0–10

The number of patients was 46 except for DLco which was 44 because 2 could not perform the examination for % DLco due to low pulmonary function.
Data are presented as mean ± standard deviation (SD). Dyspnea was assessed with the modified Borg scale.
FVC: forced vital capacity; DLco: diffusing capacity of carbon monoxide; PaO₂: partial arterial pressure of oxygen; PaCO₂: partial arterial pressure of carbon dioxide; AP: systemic arterial pressure; RAP: right arterial pressure; PAP: pulmonary artery pressure; PCWP: pulmonary capillary wedge pressure; CO: cardiac output; PVR: pulmonary vascular resistance; SpO₂: transcutaneous oxygen saturation; 6MWT: 6 min walk test.