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Related Experiment Videos

Pathogenesis of nonocclusive ischemic colitis.

R W Bailey, G B Bulkley, S R Hamilton

    Annals of Surgery
    |June 1, 1986
    PubMed
    Summary

    Cardiogenic shock causes ischemic colitis by constricting the inferior mesenteric artery (IMA). The renin-angiotensin system is the primary driver, and blocking it prevents colonic damage.

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    Area of Science:

    • Gastroenterology
    • Cardiovascular Physiology
    • Renal Physiology

    Background:

    • Ischemic colitis can occur without direct vessel obstruction.
    • Cardiogenic shock can lead to mesenteric hypoperfusion.

    Purpose of the Study:

    • To investigate the role of the renin-angiotensin system in nonocclusive ischemic colitis induced by cardiogenic shock.
    • To determine the mechanisms of mesenteric vasoconstriction during shock.

    Main Methods:

    • Inducing cardiogenic shock in anesthetized pigs via pericardial tamponade.
    • Measuring hemodynamic parameters, including arterial pressure, cardiac output, and inferior mesenteric artery blood flow.
    • Administering alpha-adrenergic blockers (phenoxybenzamine) and renin-angiotensin system inhibitors (captopril).
    • Infusing angiotensin II and performing bilateral nephrectomy to assess the renin-angiotensin axis's role.

    Main Results:

    • Cardiogenic shock significantly reduced inferior mesenteric artery blood flow due to increased vascular resistance.
    • Alpha-adrenergic blockade did not prevent mesenteric vasoconstriction, but captopril abolished it.
    • Angiotensin II infusion mimicked shock-induced mesenteric vasoconstriction.
    • Lesions of ischemic colitis were ameliorated in pigs with ablated renin-angiotensin systems.

    Conclusions:

    • Nonocclusive ischemic colitis is primarily mediated by the colonic vasculature's sensitivity to the renin-angiotensin axis.
    • The renin-angiotensin system plays a critical role in regulating mesenteric blood flow during cardiogenic shock.

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