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Related Concept Videos

Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

Veins, while chiefly responsible for circulating blood back to the heart, also function as storage vessels for blood. They house approximately 64 percent of the body's total blood volume, a feat made possible by their high capacitance—the inherent ability to expand and accommodate large volumes of blood, even under low pressure. The large diameter and thin walls of veins augment their distensibility, significantly more so than arteries, due to their classification as capacitance vessels. When...
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Related Experiment Video

Updated: Jul 8, 2026

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation
05:49

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation

Published on: May 16, 2025

A Guyton-based hypothesis for venous congestion.

Jon-Émile S Kenny1, Per Werner Möller2

  • 1Health Sciences North Research Institute, Sudbury ON, Canada.

The Ultrasound Journal
|July 7, 2026
PubMed
Summary

Venous congestion

Area of Science:

  • Cardiovascular physiology
  • Hemodynamics
  • Venous return dynamics

Background:

  • The exact causes of venous congestion are not fully understood.
  • Elevated right atrial pressure (PRA) is widely considered the primary driver of venous congestion.
  • Existing theories do not fully explain all observed phenomena of venous congestion.

Purpose of the Study:

  • To challenge the conventional understanding of venous congestion.
  • To propose an alternative model for venous congestion based on Guyton's framework.
  • To investigate the relationship between right atrial pressure and venous Doppler patterns.

Main Methods:

  • Development of a novel Geometrical model (GM) based on Guyton's established framework.
  • Analysis of predictions derived from the GM regarding venous hemodynamics.

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Published on: February 20, 2017

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Last Updated: Jul 8, 2026

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation
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Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

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  • Comparison of GM predictions with existing interpretations of venous Doppler data.

    • Main Results:

    • The GM suggests that right atrial pressure (PRA) is a dependent variable, not the primary cause of venous congestion.
    • Venous Doppler patterns do not accurately reflect a patient's volume status or responsiveness.
    • Venous congestion can occur even with low or normal PRA, contradicting traditional views.

    Conclusions:

    • The Geometrical model offers a new perspective on the pathophysiology of venous congestion.
    • Right atrial pressure is not the sole determinant of venous congestion.
    • Venous Doppler patterns are more indicative of transmural pressure than absolute right atrial pressure, necessitating a re-evaluation of their clinical interpretation.