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Regulation of Stroke Volume

Regulation of Stroke Volume

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.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...

Stroke: Introduction and Types

Stroke: Introduction and Types

A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...

Ischemic Stroke l: Introduction

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.

Ischemic Stroke ll: Pathophysiology

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...

Hemorrhagic Stroke l: Introduction

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...

Hemorrhagic Stroke ll: Pathophysiology

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...

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Related Experiment Video

Updated: Jun 17, 2026

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

Published on: August 18, 2015

Climate Change and Stroke: A Topical Narrative Review.

Anna Ranta^1,2, Janice Kang¹, Ali Saad³

¹Department of Medicine, University of Otago, Wellington, New Zealand (A.R., J.K.).

|March 4, 2024

Summary

This summary is machine-generated.

Climate change, driven by greenhouse gases, is increasing stroke risk through higher temperatures and air pollution. This review highlights the urgent need for attention to climate change impacts on stroke incidence and mortality.

Keywords:

air pollution climate change greenhouse gases stroke wildfires

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Area of Science:

Environmental Health
Neurology
Climate Science

Background:

Accumulating atmospheric greenhouse gases are altering global climate patterns.
Rising ambient temperatures and extreme weather events are linked to adverse health outcomes.
The specific impacts of climate change on stroke require comprehensive review.

Purpose of the Study:

To summarize published evidence on the links between climate change and stroke.
To discuss pathophysiologic mechanisms, vulnerable populations, and mitigation strategies.
To identify current research priorities in this field.

Main Methods:

Topical narrative review of published evidence.
Synthesis of data on associations between climate variables and stroke.
Discussion of existing literature and research gaps.

Main Results:

Consistent evidence links increasing ambient temperature and air pollution to stroke incidence and mortality.
Associations with barometric pressure, wildfires, and dust storms are suggested but require more research.
Extreme weather events like flooding may indirectly impact stroke through service disruption.

Conclusions:

Climate change poses a growing threat to the stroke community.
Elevated attention and further research are warranted to address these impacts.
Exploring synergies between stroke risk reduction and carbon footprint reduction is crucial.