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Related Concept Videos

Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

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Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
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Autoregulation of Blood Flow01:17

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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.
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Regulation of Stroke Volume01:27

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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Introduction to Hemostasis01:05

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
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Related Experiment Video

Updated: Mar 10, 2026

Standardized Hemorrhagic Shock Induction Guided by Cerebral Oximetry and Extended Hemodynamic Monitoring in Pigs
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Haemodynamic coherence in haemorrhagic shock.

Nicolas Libert1, Anatole Harrois2, Jacques Duranteau2

  • 1Laboratoire d'Etude de la Microcirculation, UMR 942, Université Paris, 7-11-13, Paris, France; Service d'Anesthésie-Réanimation, Hôpital d'instruction des armées Percy, Clamart, France.

Best Practice & Research. Clinical Anaesthesiology
|December 10, 2016
PubMed
Summary

Permissive hypotension during hemorrhage control may cause microvascular hypoperfusion. Restoring microcirculation requires maintaining hemodynamic coherence, which can be lost due to shock and injury. Real-time monitoring may enable future microcirculatory resuscitation.

Keywords:
haemodynamic coherencehaemorrhagemicrocirculationmicrocirculatory haemodynamic-driven resuscitation

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Area of Science:

  • Physiology
  • Critical Care Medicine
  • Trauma Surgery

Background:

  • Hemorrhage management often involves permissive hypotension to avoid aggressive fluid resuscitation risks.
  • Occult microvascular hypoperfusion can occur during permissive hypotension, potentially impairing tissue oxygenation.
  • Restoration of macrocirculation post-hemorrhage does not guarantee microcirculatory improvement if regulatory mechanisms are compromised.

Purpose of the Study:

  • To explore the relationship between systemic hemodynamics and microcirculation during hemorrhagic shock resuscitation.
  • To identify factors that disrupt hemodynamic coherence and hinder microcirculatory recovery.
  • To highlight the potential of real-time microcirculation monitoring for guiding resuscitation strategies.

Main Methods:

  • Review of current resuscitation strategies for hemorrhagic shock.
  • Discussion of the concept of hemodynamic coherence in microcirculation.
  • Exploration of the impact of shock, reperfusion, trauma, and inflammation on microvascular function.

Main Results:

  • Systemic hemodynamic-driven resuscitation may fail to restore microcirculation when hemodynamic coherence is lost.
  • Damage to microcirculation from trauma, inflammation, or shock can lead to a loss of hemodynamic coherence.
  • Current resuscitation strategies may be insufficient to address microcirculatory dysfunction in complex trauma patients.

Conclusions:

  • Maintaining hemodynamic coherence is crucial for effective microcirculatory resuscitation after hemorrhage.
  • Microcirculatory dysfunction can persist despite optimized macrocirculation due to altered regulatory mechanisms.
  • Real-time microcirculation monitoring offers a promising avenue for developing microcirculatory-guided resuscitation, potentially becoming a future standard of care.