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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.

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.

Last updated: Jul 30, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Noninvasive Gas Exchange Determinants of Exercise Hemodynamics in Non-Severe Pulmonary Hypertension Associated With Interstitial Lung Disease.

observational

Dagher C, Moallem N, Fiscus G, Carollo B, Swanson K, Farber HW, Parikh R · Pulmonary circulation (2026)

Participants: N/A
Duration: N/A
Intervention: Submaximal exercise testing measuring GXCAP and VE/VCO2
Outcome: Identification of exercise-induced pulmonary vascular resistance (PVRD phenotype) via invasive Level 3 CPET
Effect Size: N/A
Population: 16 patients with non-severe pulmonary hypertension associated with interstitial lung disease (PH-ILD)

Result:

PubMed: 42516687DOI: 10.1002/pul2.70358

Mechanism Graph

Submaximal exercise testing is performed to measure gas-exchange parameters
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GXCAP and VE/VCO2 are calculated from exhaled gases
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Lower GXCAP and higher VE/VCO2 indicate dynamic pulmonary vascular impairment
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These markers correlate with invasive hemodynamic measures of exercise-induced PVR increase

Limitations

  • ⚠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).

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References

  1. 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
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.