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Related Concept Videos

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...
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...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
Portal Hypertension01:22

Portal Hypertension

Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Overview of Hematopoiesis01:20

Overview of Hematopoiesis

Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...

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Sub-acute Cerebral Microhemorrhages Induced by Lipopolysaccharide Injection in Rats
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Published on: October 17, 2018

Hemorheological changes caused by lead exposure.

C B Kim1, Sehyun Shin1, Seok-Heung Song1

  • 1School of Mechanical Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul, Korea.

Clinical Hemorheology and Microcirculation
|October 19, 2012
PubMed
Summary
This summary is machine-generated.

This study reveals that lead exposure significantly impairs red blood cell (RBC) deformability and aggregation, impacting hemorheology and microcirculation. High lead concentrations reduce RBC flexibility, posing risks to blood flow.

Keywords:
Leadaggregationdeformabilityhemorheologytoxicology

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Area of Science:

  • Environmental toxicology
  • Hematology
  • Physiology

Background:

  • Lead is a pervasive toxic heavy metal.
  • Lead exposure causes widespread physiological and biochemical disruptions.
  • Understanding lead's impact on blood properties is crucial for public health.

Purpose of the Study:

  • To investigate the effects of lead on hemorheological parameters.
  • To assess lead's influence on red blood cell (RBC) deformability and aggregation.

Main Methods:

  • Incubation of RBCs with varying concentrations of lead-rich plasma.
  • Measurement of RBC deformability and aggregation.
  • Observation of changes over time (incubation).

Main Results:

  • Low lead concentrations did not affect RBC deformability.
  • High lead concentrations significantly decreased RBC deformability within 1 hour.
  • Increased lead concentration and incubation time led to altered RBC aggregation.

Conclusions:

  • Lead exposure significantly impacts hemorheology, specifically RBC deformability and aggregation.
  • These alterations can affect microcirculation.
  • The findings underscore the hemorheological risks associated with lead toxicity.