Gas-exchange derived pulmonary vascular capacitance (GXCAP) and ventilatory efficiency (VE/VCO2) measured during submaximal exercise testing can identify non-severe PH-ILD patients with exercise-induced increases in pulmonary vascular resistance.
In 16 patients with non-severe pulmonary hypertension associated with interstitial lung disease, GXCAP was significantly higher in those with static PVR (471 ± 85 mL·mmHg) versus dynamic PVR (311 ± 38 mL·mmHg, p < 0.01), while VE/VCO2 was lower in static PVR (33 ± 2 vs 37 ± 2.5, p < 0.01). ROC analysis showed excellent discrimination for GXCAP (AUC 0.98) and good discrimination for VE/VCO2 (AUC 0.90) in identifying the dynamic PVR phenotype.
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Gas-exchange derived pulmonary vascular capacitance (GXCAP) and ventilatory efficiency (VE/VCO2) measured during submaximal exercise testing can identify non-severe PH-ILD patients with exercise-induced increases in pulmonary vascular resistance. The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 32/100 (low).
The Claim
Gas-exchange derived pulmonary vascular capacitance (GXCAP) and ventilatory efficiency (VE/VCO2) measured during submaximal exercise testing can identify non-severe PH-ILD patients with exercise-induced increases in pulmonary vascular resistance.
This conclusion is most relevant to: 16 patients with non-severe pulmonary hypertension associated with interstitial lung disease (PH-ILD).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Noninvasive Gas Exchange Determinants of Exercise Hemodynamics in Non-Severe Pulmonary Hypertension Associated With Interstitial Lung Disease. (Pulmonary circulation, 2026) —
How It Works
The proposed biological pathway:
- ▸Submaximal exercise testing is performed to measure gas-exchange parameters
- ▸GXCAP and VE/VCO2 are calculated from exhaled gases
- ▸Lower GXCAP and higher VE/VCO2 indicate dynamic pulmonary vascular impairment
- ▸These markers correlate with invasive hemodynamic measures of exercise-induced PVR increase
Who Might Benefit
Evidence fit by population:
- ▸16 patients with non-severe pulmonary hypertension associated with interstitial lung disease (PH-ILD)
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Retrospective study design with small sample size (n=16)
- ▸Validation in larger prospective cohorts is needed before clinical application
Frequently Asked Questions
What is GXCAP?▼
GXCAP is a gas-exchange derived estimate of pulmonary vascular capacitance, calculated from submaximal exercise testing data.
How does VE/VCO2 relate to pulmonary vascular disease?▼
Higher VE/VCO2 indicates worse ventilatory efficiency and is associated with increased pulmonary vascular resistance during exercise.
Can these tests replace invasive catheterization?▼
The study suggests they may serve as noninvasive alternatives for identifying exercise-induced pulmonary vascular impairment, but invasive testing remains the gold standard.
What population was studied?▼
Patients with non-severe pulmonary hypertension associated with interstitial lung disease (PH-ILD).
References
- 1.Dagher C, Moallem N, Fiscus G, Carollo B, Swanson K, Farber HW, Parikh R. “Noninvasive Gas Exchange Determinants of Exercise Hemodynamics in Non-Severe Pulmonary Hypertension Associated With Interstitial Lung Disease..” Pulmonary circulation, 2026. PMID: 42516687 DOI: 10.1002/pul2.70358