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Experimental regional enteritis in pigs

T V Kalima, H Saloniemi, T Rahko

    Scandinavian Journal of Gastroenterology
    |January 1, 1976
    PubMed
    Summary
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    Lymphatic obstruction in the ileum causes inflammation, edema, and ulcerations, leading to complications like fistulae. Impaired lymphatic function inhibits particle transport, causing chronic irritation and tissue damage.

    Area of Science:

    • Gastroenterology
    • Surgical Pathology
    • Veterinary Medicine

    Background:

    • Lymphatic obstruction is a consistent feature of regional enteritis, but its precise role in disease development remains unclear.
    • Pigs are susceptible to spontaneous ileitis, making them a suitable model for studying intestinal lymphatic obstruction.

    Purpose of the Study:

    • To investigate the pathological consequences of surgically induced lymphatic obstruction in the terminal ileum of pigs.
    • To elucidate the role of lymphatic dysfunction in the pathogenesis of ileitis.

    Main Methods:

    • Regional lymph nodes in the terminal ileum of 21 pigs were injected with formalin to induce long-lasting lymphatic obstruction.
    • Pigs were monitored for growth retardation, physical changes in the ileum, and development of complications.

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  • Histopathological examination was performed to assess inflammatory responses, lymphatic changes, and tissue alterations.

    • Main Results:

    • Obstructed pigs exhibited retarded growth, ileal edema, hyperemia, adhesions, and mucosal ulcerations.
    • Eleven pigs developed fistulae; no cases of chylous ascites were observed.
    • Histology revealed granulomatous inflammation, lymphatic thrombosis, lymphoid hyperplasia, and progressive subserosal fibrosis, ultimately leading to transmural inflammation.

    Conclusions:

    • Sustained lymphatic obstruction leads to chronic irritation, edema, and impaired tissue oxygenation, promoting fibrosis and increasing susceptibility to infection.
    • The findings suggest that lymphatic dysfunction is a significant factor in the pathogenesis of ileitis, potentially leading to ulcerations and fistulae formation.