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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

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Related Experiment Video

Updated: May 13, 2026

Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
11:08

Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases

Published on: June 22, 2012

From macrohemodynamic to the microcirculation.

Abele Donati1, Roberta Domizi, Elisa Damiani

  • 1Sezione di Anestesia e Rianimazione, Dipartimento di Scienze Biomediche e Sanità Pubblica, Università Politecnica delle Marche, Ancona, Via Tronto 10, 60020 Torrette (Ancona), Italy ; AOU Ospedali Riuniti, Via Conca 71, 60020 Ancona, Italy ; Department of Translational Physiology, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.

Critical Care Research and Practice
|March 20, 2013
PubMed
Summary
This summary is machine-generated.

Optimizing macrohemodynamics in ICU patients is insufficient for preventing organ failure. Restoring microcirculation, the network of small blood vessels, is crucial for improving outcomes in critical illness.

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Microperfusion Technique to Investigate Regulation of Microvessel Permeability in Rat Mesentery
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Microperfusion Technique to Investigate Regulation of Microvessel Permeability in Rat Mesentery

Published on: September 12, 2015

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Last Updated: May 13, 2026

Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
11:08

Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases

Published on: June 22, 2012

Microperfusion Technique to Investigate Regulation of Microvessel Permeability in Rat Mesentery
12:48

Microperfusion Technique to Investigate Regulation of Microvessel Permeability in Rat Mesentery

Published on: September 12, 2015

Area of Science:

  • Critical Care Medicine
  • Vascular Physiology
  • Intensive Care Unit (ICU) Pathophysiology

Background:

  • Standard macrohemodynamic optimization in ICU patients does not always prevent organ failure.
  • Microcirculation, vessels ≤100 μm in diameter, plays a vital role in tissue perfusion and organ function.
  • Understanding microcirculatory derangements is essential for advancing critical care.

Purpose of the Study:

  • To review current knowledge on microcirculatory derangements in critical illness.
  • To highlight the importance of microcirculatory restoration for preventing organ failure.
  • To encourage further research into microvascular physiopathology and therapeutic strategies.

Main Methods:

  • Utilizes Sidestream Dark Field (SDF) imaging for bedside investigation of microcirculation.
  • Summarizes findings from a round-table conference on microcirculatory evaluation criteria.
  • Reviews existing literature on microcirculatory alterations in sepsis, hypovolemia, and cardiac failure.

Main Results:

  • Sepsis-associated microcirculatory derangements include reduced vessel density, altered flow, and heterogeneous perfusion.
  • Endothelial dysfunction and glycocalyx rupture contribute to microthrombi, capillary leakage, and inflammatory cell interactions.
  • Microcirculatory alterations are also observed in hypovolemia and cardiac failure, warranting further investigation.

Conclusions:

  • Microcirculatory restoration is a critical target for preventing organ failure in ICU patients.
  • SDF imaging provides a valuable tool for assessing bedside microcirculatory function.
  • Further research is needed to fully elucidate microvascular pathophysiology and develop targeted therapies.