Commentary & Perspectives
Vascular ‘Waterfall’ May Reframe Perfusion
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By
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April 24, 2026
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3 min
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1
Blood flow depends on critical closing pressure (Pcrit).
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Vascular waterfall model emphasizes flow's independence from downstream pressure.
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Perfusion relies on arterial pressure exceeding Pcrit.
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Pcrit can be estimated indirectly via pressure-flow relationships.
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Vasoplegic shock lowers Pcrit, affecting autoregulation.
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Elevated PEEP decreases venous return and pulmonary blood flow.
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Interventions must consider arterial pressure and Pcrit to be effective.
