CHARACTERISTICS OF THE FUNCTIONAL STATE OF SMALL-CALIBER ARTERIES UNDER THE INFLUENCE OF PNEUMOPERITONEUM OF VARIOUS DURATION AND SIMULATED MECHANICAL JAUNDICE IN THE EXPERIMENT
DOI:
https://doi.org/10.11603/2414-4533.2025.3.15671Keywords:
morphology, muscle tissue, jaundice, intra-abdominal pressure, rats, experimentAbstract
The aim of the work: to conduct a morphometric analysis of the features of changes in the indicators of small-caliber arteries of the diaphragm under conditions of pneumoperitoneum with intra-abdominal pressure of 10 mmHg of different duration during simulated mechanical jaundice.
Materials and Methods. For the experimental study, sexually mature white rats of the reproductive period (6–7 months), weighing (225.0±15.0) grams, in a total of 55 individuals, were selected. The animals were divided into 4 groups: control – individuals with mechanical jaundice; and three experimental groups where jaundice and pneumoperitoneum were simulated for 1, 2 and 3 hours according to the group number. At the end of the experiment, the diaphragm was isolated and morphometric indicators were determined.
Results. As a result of the action of the simulated pathological processes, an increase in the indicators of the external diameter of the artery from 5.9 to 6.7 %, a decrease in the internal diameter of the vessel from 24.6 to 25.4 % was observed. The Wogenvoord index increased by 2.1 times, while the thickness of the media naturally increased from 17.1 to 18.7 %. Changes in these indicators indicated a violation of the blood supply to the organ, a sharp decrease in the throughput of vessels of this type. The indicators of the height of endothelial cells and the diameter of their nuclei decreased, but no statistically significant difference was found. The relative volume of damaged endothelial cells increased significantly from (3.32±0.24) % to (29.50±0.21) % in the costal part of the diaphragm and from (4.03±0.11) % to (30.70±0.14) % in the lumbar part, which indicated signs of endothelial dysfunction. These changes should be taken into account in the clinical practice of doctors in surgical departments, where laparoscopic surgical interventions are common, for a better understanding of the impact of pneumoperitoneum on the human body and the diaphragm in particular, which plays an important role in the act of breathing and pulmonary excursion.
Conclusions. The results obtained indicate that pneumoperitoneum created by carbon dioxide leads to changes in the morphometric parameters of small-caliber arteries, which are directly proportional to the duration of the latter.
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