Related Experiment Video
Updated: Aug 9, 2026

Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats
Published on: August 1, 2018
[Influence of liver cirrhosis with and without ascites on ventilatory mechanics]
J J Ordiales Fernández1, A Fernández Moya, F Nistal de Paz
1Sección de Neumología, Complejo Hospitalario de León.
Background:
The thoracic cavity plays an important role in the mechanical ventilatory function, and the alteration of some of its structures, such as those which occur in decompensated cirrhosis of the liver, for example the presence of ascites and muscle atrophy, directly influence its normal function.
Methods:
In the present study we have evaluated the ventilatory function and respiratory muscular tension by means of the calculation of volumes, flows and resistances of the airways, and also the maximum inspiratory and expiratory pressures (Pimax, Pemax).
Patients:
One hundred patients with liver cirrhosis and ascites without associated respiratory illness, mean age 57 +/- 15 years (range 32-80), were studied. We evaluated the respiratory function before and after the disappearance of the ascites.
Results:
A restrictive pattern was evident, and various parameters were altered. The most affected being that of the reserve expiratory volume. No associated bronchial obstruction was observed. Respiratory muscular tension was decreased in both the Pimax and the Pemax. With the disappearance of the ascites we found an improvement in the affected parameters, but this did not reach normality.
Conclusion:
In liver cirrhosis associated with ascites, the most common respiratory pattern, is a decrease in ventilatory function of a restrictive type, and also a decrease in the respiratory muscular tension. These alterations improve after the resolution of the ascites.
Related Concept Videos
Factors Affecting Pulmonary Ventilation
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Mechanical Ventilation I: Indication and Settings
Atelectasis II: Pathophysiology
Cirrhosis I: Introduction
Cirrhosis II: Pathophysiology
Ascites

