Morphological changes in hepatic vessels during modeling of pulmonary trunk stenosis and after its elimination

Experiments on dogs showed that pulmonary trunk stenosis increased the tone of arterial vessels in the liver and led to the development of veno-arterial and veno-venous reactions. The number of vessels with intimal musculature and myoelastic sphincters in the arterial bed increases, and muscle rolls in large hepatic veins are thickened. The walls are hypertrophic in all vessels. Elimination of the defect abolished the previously formed vascular adaptation reactions, the tone in afferent liver vessels decreased, which leads to regression of hypertrophic changes in their tunica media. The number of arteries with intimal musculature and sphincters decreases. Muscle rolls in the efferent hepatic veins are thinned.