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Summary
Low blood flow states damage organs by altering subepithelial microcirculation, leading to epithelial barrier breakdown. This study reviews evidence supporting this hypothesis for conditions like hemorrhagic enteritis and shock lung.
Area of Science:
- Physiology
- Pathology
- Microcirculation
Background:
- Epithelium-lined organs are susceptible to damage during low flow states.
- Conditions like hemorrhagic enteritis, stress ulcers, renal tubular necrosis, acalculous cholecystitis, and "shock lung" can arise from such states.
Purpose of the Study:
- To present and summarize evidence for a hypothesis on the pathogenesis of organ damage in low flow states.
- To elucidate the role of subepithelial microcirculatory blood flow redistribution and epithelial barrier integrity.
Main Methods:
- Review and synthesis of existing scientific evidence.
- Analysis of the proposed pathogenetic mechanisms in low flow states.
Main Results:
- Evidence supports the hypothesis that microcirculatory changes are key.
- Redistribution of subepithelial blood flow contributes to epithelial barrier damage.
Conclusions:
- The hypothesis regarding microcirculatory redistribution and epithelial barrier damage offers a unifying explanation for various organ lesions in low flow states.
- Further research into these mechanisms is warranted.