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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

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.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Regulation of Stroke Volume01:27

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...
Ischemic Stroke ll: Pathophysiology01:15

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...
Ischemic Stroke l: Introduction01:15

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.
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...

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Related Experiment Video

Updated: Jun 21, 2026

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
07:12

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry

Published on: January 19, 2020

Autoregulation after ischaemic stroke.

William J Powers1, Tom O Videen, Michael N Diringer

  • 1Department of Neurology, University of North Carolina School of Medicine, North Carolina 27599-7025, USA. powersw@neurology.unc.edu

Journal of Hypertension
|August 1, 2009
PubMed
Summary
This summary is machine-generated.

Lowering blood pressure in acute ischemic stroke patients did not significantly impair cerebral blood flow (CBF) in the affected hemisphere. Reductions in CBF were observed but were similar in both hemispheres, suggesting a systemic effect rather than localized autoregulation impairment.

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Real-Time Monitoring and Modulation of Blood Pressure in a Rabbit Model of Ischemic Stroke
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Last Updated: Jun 21, 2026

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
07:12

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Published on: January 19, 2020

Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
11:26

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Published on: December 10, 2014

Real-Time Monitoring and Modulation of Blood Pressure in a Rabbit Model of Ischemic Stroke
09:00

Real-Time Monitoring and Modulation of Blood Pressure in a Rabbit Model of Ischemic Stroke

Published on: February 10, 2023

Area of Science:

  • Neurology
  • Cardiovascular Medicine
  • Medical Imaging

Background:

  • Management of hypertension in acute ischemic stroke is controversial due to a lack of clinical trial data.
  • It remains unclear if reducing mean arterial pressure (MAP) impairs cerebral blood flow (CBF) autoregulation in the peri-infarct region.

Purpose of the Study:

  • To investigate the effect of acute blood pressure reduction on regional CBF in patients with acute ischemic stroke.
  • To determine if autoregulation is impaired in the peri-infarct region following a reduction in MAP.

Main Methods:

  • Nine patients with acute hemispheric ischemic stroke and elevated blood pressure underwent baseline CBF measurements using PET.
  • Mean arterial pressure was reduced by approximately 16 mmHg using intravenous nicardipine.
  • Regional CBF was measured again after blood pressure reduction.

Main Results:

  • No significant differences in the percentage change of CBF were observed in the infarct, peri-infarct, or remaining ipsilateral hemisphere compared to the contralateral side.
  • Two participants experienced CBF reductions exceeding 19% in both hemispheres.
  • These reductions were likely due to a systemic effect, possibly an upward shift in the autoregulatory curve from chronic hypertension.

Conclusions:

  • Selective regional impairment of CBF autoregulation in the infarcted hemisphere is not characteristic of acute ischemic stroke.
  • Individual monitoring of global CBF may help determine safe MAP reduction limits in acute ischemic stroke.
  • Further clinical trials are needed to demonstrate the benefit of such monitoring on patient outcomes.