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Related Concept Videos

Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

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...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Alterations in Blood Pressure01:30

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Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
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Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
Hormonal Regulation of Blood Pressure01:17

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...

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Updated: Jun 16, 2026

Standardized Hemorrhagic Shock Induction Guided by Cerebral Oximetry and Extended Hemodynamic Monitoring in Pigs
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Early physiologic responses to hemorrhagic hypotension.

Ivo P Torres Filho1, Luciana N Torres, Roland N Pittman

  • 1Department of Physiology and Biophysic, Virginia Commonwealth University Reanimation Engineering Shock Center (VCURES), Virginia Commonwealth University Health System, Richmond, VA 23298-0551, USA. itorres@vcu.edu

Translational Research : the Journal of Laboratory and Clinical Medicine
|February 5, 2010
PubMed
Summary

Early physiological responses to blood loss can predict survival from hemorrhagic hypotension (HH). Survivors exhibit distinct cardiorespiratory and metabolic patterns compared to non-survivors, even before lethal bleeding occurs.

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Area of Science:

  • Physiology
  • Hemorrhagic Hypotension Research
  • Critical Care Medicine

Background:

  • Early identification of hemorrhagic hypotension (HH) severity is crucial for timely therapeutic interventions.
  • Limited systematic studies exist on physiological variables during the initial stages of hemorrhage.
  • Understanding early responses may offer insights into the underlying mechanisms of HH survival.

Purpose of the Study:

  • To investigate the relevance of specific systemic changes during and after the bleeding phase of HH.
  • To determine if early physiological responses to blood loss correlate with survival from lethal hemorrhage levels.
  • To examine the predictive value of physiological variables in differentiating survivors from non-survivors of HH.

Main Methods:

  • A stepwise hemorrhage model was employed in 44 rats, simulating prehospital scenarios.
  • Key physiological parameters including heart rate, blood pressure, respiratory parameters, acid-base status, glucose, lactate, and electrolytes were measured.
  • Rats were categorized into survivors (S) and non-survivors (NS) based on their ability to withstand 100 minutes of hemorrhage.

Main Results:

  • Survivors (S) and non-survivors (NS) displayed significantly different physiological responses even at non-lethal bleeding levels.
  • S demonstrated higher blood pressure and ventilation compared to NS.
  • NS showed lower pH in later stages, with notable changes in bicarbonate and base excess occurring earlier during hemorrhage. Plasma K+ levels and glucose extraction were also higher in NS.

Conclusions:

  • Cardiorespiratory and metabolic responses during hemorrhage can distinguish between individuals who will survive and those who will not.
  • These physiological markers are essential for survival in HH and can be identified before reaching lethal bleeding thresholds.
  • The findings support the potential for early therapeutic strategies based on monitoring these differentiating physiological responses.