. 2020 Nov 25;10(4):2045894020972273. doi: 10.1177/2045894020972273

Table 2.

Sub-maximum CPET parameters.

	Control (n = 18)	Ipc-PH (n = 19)	Cpc-PH (n = 27)
Time between RHC and sub-maximum CPET, median (IQR), days	51 (10–107)	19 (8–34)	15 (8–23)
ETCO₂ (mmHg)	35 ± 5	38 ± 4	34 ± 4^b
Rest SpO₂ (%)	97 ± 1	95 ± 2^a	95 ± 2^a
Peak SpO₂ (%)	95 ± 2	90 ± 3^a	90 ± 4^a
RER	1.03 ± 0.1	1.03 ± 0.1	1.04 ± 0.1
VE/VCO₂	31 ± 10	31 ± 7	41 ± 11^a^,b
Delta ETCO₂ (mmHg)	1.9 ± 5.0	−0.2 ± 4.0	−3.6 ± 3.4^a^,b
GX_CAP (mL*mmHg)	611 ± 247	541 ± 141	348 ± 137^a^,b
OUES (% predicted)	102 ± 22	79 ± 20^a	61 ± 15^a^,b
O₂ pulse (mL/O₂/beat)	180 ± 102	101 ± 22^a	98 ± 36^a
Sub-maximum VO₂ (% predicted)	98 ± 18	64 ± 11^a	60 ± 18^a
Extrapolated maximum VO₂(% predicted)	121 ± 44	69 ± 18^a	62 ± 21^a

Note: Data presented as no. (%) or mean ± SD unless otherwise stated.

CPET: cardiopulmonary; Ipc-PH: isolated post-capillary pulmonary hypertension; Cpc-PH: combined pre-and post-capillary pulmonary hypertension; RHC: right heart catheterization; ETCO₂: end tidal carbon dioxide; SpO₂: peripheral oxygen saturation; RER: respiratory exchange ratio; VE/VCO₂: ventilatory efficiency; GX_CAP: gas exchange derived pulmonary vascular capacitance; OUES: oxygen uptake efficiency slope; VO₂: oxygen consumption.

^ap-value < 0.05 vs. controls.

^bp-value < 0.05 vs. Ipc-PH.