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SHR Neuro Cancer Cardio Lipid Metab Microb

Sassmann, T; Douschan, P; Foris, V; Tröster, N; Zeder, K; Brcic, L; Tornyos, A; Bachmaier, G; Fuchsjäger, M; Olschewski, H; Kovacs, G.
Abnormal pulmonary hemodynamics during exercise is associated with exercise capacity in COPD.
Respir Res. 2022; 23(1):331 Doi: 10.1186/s12931-022-02238-9 [OPEN ACCESS]
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Leading authors Med Uni Graz

John Teresa

Kovacs Gabor

Co-authors Med Uni Graz

Bachmaier Gerhard

Brcic Luka

Douschan Philipp

Foris Vasile

Fuchsjäger Michael

Olschewski Horst

Tornyos Adrienn

Tröster Natascha

Zeder Katarina Eleonora

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Abstract:

BACKGROUND: Pulmonary hypertension (PH) is a frequent complication in COPD and it is associated with decreased exercise capacity and poor prognosis. We hypothesized that even in COPD patients without significant PH at rest, abnormal pulmonary hemodynamics during exercise affect exercise capacity. METHODS: Consecutive COPD patients with clinically indicated right heart catheterization and resting mean pulmonary arterial pressure (mPAP) < 25 mmHg and age- and sex-matched controls with the same limits of pulmonary hemodynamics but no chronic lung disease who underwent clinical work-up including invasive hemodynamic assessment during exercise, were retrospectively analyzed. Chi-square tests were used to evaluate differences between groups for categorical data and Fisher's exact test or Mann-Whitney-U-tests for continuous variables. Associations were analyzed with Spearman rank correlation tests. RESULTS: We included n = 26 COPD patients (female/male: 16/10, 66 ± 11 yr, FEV₁: 56 ± 25%predicted) and n = 26 matched controls (FEV₁: 96 ± 22%predicted). At rest, COPD patients presented with slightly increased mPAP (21 (18-23) vs. 17 (14-20) mmHg, p = 0.022), and pulmonary vascular resistance (PVR) [2.5 (1.9-3.0) vs. 1.9 (1.5-2.4) WU, p = 0.020] as compared to controls. During exercise, COPD patients reached significantly higher mPAP [47 (40-52) vs. 38 (32-44) mmHg, p = 0.015] and PVR [3.1 (2.2-3.7) vs. 1.7 (1.1-2.9) WU, p = 0.028] values despite lower peak exercise level [50 (50-75) vs. 100 (75-125) Watt, p = 0.002]. The mPAP/cardiac output slope was increased in COPD vs. controls [6.9 (5.5-10.9) vs. 3.7 (2.4-7.4) mmHg/L/min, p = 0.007] and negatively correlated with both peak oxygen uptake (r = - 0.46, p = 0.007) and 6-min walk distance (r = - 0.46, p = 0.001). CONCLUSION: Even in the absence of significant PH at rest, COPD patients reveal characteristic abnormalities in pulmonary hemodynamics during exercise, which may represent an important exercise-limiting factor.

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Humans - administration & dosage

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Exercise hemodynamics

Exercise capacity

Right heart catheterization

COPD

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