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Related Concept Videos

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Vascular Spasm

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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...
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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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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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Ischemic Heart Disease: Overview01:17

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Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
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Arteries of the Lower Limbs01:24

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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
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Arteries of Lower Limbs01:20

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The external iliac artery transitions out of the body cavity, entering the femoral region of the lower leg, and is renamed the femoral artery at the point where it traverses the body wall. This artery is responsible for the distribution of blood to the thigh's deep muscles and the skin's ventral and lateral regions, achieved through several minor branches and the lateral deep femoral artery, which also spawns a lateral circumflex artery. The knee area receives blood from the genicular...
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Related Experiment Video

Updated: Jun 26, 2025

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia
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A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

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Stroke.

Nina A Hilkens1, Barbara Casolla2, Thomas W Leung3

  • 1Department of Neurology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands; Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, Netherlands.

Lancet (London, England)
|May 17, 2024
PubMed
Summary
This summary is machine-generated.

Stroke is a leading cause of death globally, characterized by sudden neurological deficits. Recent advancements include new treatments for ischemic stroke and improved care for hemorrhagic stroke, enhancing patient outcomes.

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Area of Science:

  • Neurology
  • Vascular Medicine
  • Public Health

Background:

  • Stroke is a major global health issue, being the second leading cause of death worldwide.
  • It presents clinically with sudden neurological deficits, often stemming from vascular causes.
  • Prevalence varies significantly, affecting a substantial portion of the population in both high- and low-income countries.

Purpose of the Study:

  • To review current understanding and management of stroke, encompassing diagnosis, acute treatment, and secondary prevention.
  • To highlight recent therapeutic advancements in both ischemic and hemorrhagic stroke.
  • To emphasize the importance of mechanism-guided secondary prevention strategies.

Main Methods:

  • Review of diagnostic neuroimaging techniques (CT, MRI) for characterizing stroke.
  • Analysis of current and emerging treatments for acute ischemic stroke, including thrombolysis and endovascular thrombectomy.
  • Examination of management protocols for intracerebral hemorrhage, focusing on bundled care and blood pressure management.
  • Overview of secondary prevention strategies based on underlying stroke mechanisms.

Main Results:

  • Multimodal CT/MRI effectively identifies stroke pathology and aids in treatment decisions.
  • Tenecteplase is a safe and effective alternative for intravenous thrombolysis in acute ischemic stroke.
  • Endovascular thrombectomy indications have expanded for large vessel occlusion strokes, with extended time windows.
  • Bundled care protocols improve outcomes for intracerebral hemorrhage.
  • Secondary prevention strategies are tailored to stroke mechanisms, including pharmacological, vascular, and lifestyle interventions.

Conclusions:

  • Significant advancements have been made in the acute management of both ischemic and hemorrhagic strokes.
  • Expanded treatment windows and new therapeutic options improve patient outcomes.
  • Mechanism-based secondary prevention is crucial for reducing stroke recurrence and long-term disability.