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Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction

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Published on: June 19, 2025

Gas diffusion and alveolar-capillary unit in chronic heart failure.

Piergiuseppe Agostoni¹, Maurizio Bussotti, Gaia Cattadori

¹Centro Cardiologico Monzino, IRCCS, Istituto di Cardiologia, Università di Milano, via Parea 4, 20138 Milan, Italy. piergiuseppe.agostoni@ccfm.it

European Heart Journal

|October 10, 2006

Summary

Alveolar gas diffusion (DLCO) worsens with chronic heart failure (CHF) severity due to reduced lung tissue. In severe CHF, remaining alveolar-capillary units are more efficient to maintain gas exchange.

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Last Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction

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Published on: June 19, 2025

Glomerular Filtration

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Renal Corpuscle

Renal Corpuscle

Area of Science:

Pulmonary physiology
Cardiology
Respiratory medicine

Background:

Alveolar gas diffusion (DLCO) is a key measure of lung function.
Chronic heart failure (CHF) is known to impair DLCO.
The specific contributions of membrane diffusion (DM) and capillary blood volume (VC) to DLCO impairment in CHF are not well understood.

Purpose of the Study:

To investigate the relationship between CHF severity and the components of alveolar gas diffusion, specifically DM, VC, and alveolar volume (VA).
To assess the efficiency of the alveolar-capillary unit in patients with varying degrees of CHF.

Main Methods:

Pulmonary function tests, including DLCO, DM, VC, and VA, were performed on 191 CHF patients (NYHA class I-III).
Patients were stratified into four groups based on peak exercise oxygen uptake (pVO(2)).
The DM/VC ratio was calculated as an index of alveolar-capillary unit efficiency.

Main Results:

DLCO, DM, VC, and VA were significantly reduced in patients with more severe CHF.
All measured parameters showed a linear relationship with pVO(2).
The DM/VC ratio was highest in the most severe CHF group, indicating increased efficiency of the remaining alveolar-capillary units.

Conclusions:

Progressive worsening of DLCO in CHF is primarily driven by a reduction in lung tissue involved in gas exchange (decreased VC and VA).
In advanced CHF, the alveolar-capillary units that remain functional exhibit enhanced efficiency (higher DM/VC ratio).
This compensatory mechanism helps maintain gas exchange efficiency despite significant disease progression.