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Related Concept Videos

Anatomy of the Heart01:27

Anatomy of the Heart

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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:27

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The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
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Coronary Circulation01:21

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
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Coronary Artery Disease I: Introduction01:30

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Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
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Coronary Artery Disease II: Pathophysiology01:26

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Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...
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Acute Coronary Syndrome I: Introduction01:30

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Acute Coronary Syndrome (ACS) encompasses a spectrum of heart conditions caused by sudden obstruction of coronary arteries, typically resulting from the rupture of an atherosclerotic plaque and subsequent thrombus (blood clot) formation. This obstruction can lead to partial or complete blockage of blood flow, causing varying degrees of myocardial ischemia or infarction.ACS includes the following clinical entities:Unstable Angina (UA)Non-ST-Elevation Myocardial Infarction (NSTEMI)ST-Elevation...
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Related Experiment Video

Updated: Jan 28, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
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Native Coronary Collateral Microcirculation Reserve in Rat Hearts.

Xiucheng Liu1, Hongyan Dong2, Bing Huang1

  • 11 Department of Thoracic Cardiovascular Surgery Affiliated Hospital of Xuzhou Medical University Xuzhou China.

Journal of the American Heart Association
|March 2, 2019
PubMed
Summary

A previously unknown, short-lived coronary collateral microcirculation reserve exists in rat hearts. This reserve’s instability contributes to acute myocardial infarction complications like edema.

Keywords:
acute myocardial infarctioncollateral circulationcoronary microcirculationedema

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Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
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Related Experiment Videos

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Isolation of Endocardial and Coronary Endothelial Cells from the Ventricular Free Wall of the Rat Heart
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Area of Science:

  • Cardiovascular Research
  • Myocardial Infarction Pathophysiology
  • Microcirculation Studies

Background:

  • Native collateral blood flow assessment in early acute myocardial infarction (AMI) is challenging due to a recessive trend.
  • Understanding the coronary collateral circulation, particularly microcirculation, is crucial for accurate AMI evaluation.

Purpose of the Study:

  • To investigate the coronary collateral circulation system, focusing on microcirculation, in the context of AMI.
  • To characterize the behavior and structural integrity of native collateral blood flow during early AMI.

Main Methods:

  • Utilized positron emission tomography (PET) perfusion imaging in rats to detect native collateral flow.
  • Employed tracers to label collateral networks within the ischemic area.
  • Examined the ultrastructure of collateral microvessels.

Main Results:

  • Native collateral flow is initially abundant but highly unstable in early AMI, leading to rapid failure.
  • A massive preformed collateral network was identified in the ischemic region.
  • Flawed microvessel ultrastructure resulted in extensive leakage and interstitial edema.

Conclusions:

  • Rat hearts possess a widely distributed, unrecognized, short-lived native coronary collateral microcirculation reserve.
  • The instability of this reserve contributes to the transient nature of native collateral blood flow in early AMI.
  • Immature microvessel structure leads to short-lived function and promotes early interstitial edema in AMI.