Vascular ‘Waterfall’ May Reframe Perfusion - Summary - MDSpire
Commentary & Perspectives

Vascular ‘Waterfall’ May Reframe Perfusion

Review suggests pressure thresholds—not gradients—may drive blood flow in shock and ventilation

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Blood flow in circulation may depend more on critical closing pressure (Pcrit) rather than simply the arterial-venous pressure gradient. A narrative review synthesizes various physiological models and clinical observations to highlight the 'vascular waterfall' concept, indicating that when intravascular pressure drops below Pcrit, vessels partially collapse and flow detaches from downstream pressure influence. This framework is relevant in assessing hemodynamic status in patients, especially those in shock, emphasizing the importance of maintaining arterial pressure above Pcrit for effective perfusion.

Original Source(s)

Vascular ‘Waterfall’ May Reframe Perfusion

  • by Andrea Surnit

  • April 24, 2026

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