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Related Concept Videos

Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
Coronary Circulation01:21

Coronary Circulation

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.
Coronary circulation begins at the base of the aorta, where two main arteries arise—the left and right coronary arteries. These arteries encircle the heart in the coronary sulcus and supply the...
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...
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.
Coronary Artery Disease II: Pathophysiology01:26

Coronary Artery Disease II: Pathophysiology

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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Related Experiment Video

Updated: May 15, 2026

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
06:39

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

Published on: April 13, 2015

Correlation between the hematocrit and slow coronary flow.

Su Wang1, Yanyan Zhang2, Yutong Cheng1

  • 1Department of Cardiology, Beijing An Zhen Hospital Affiliated to Capital Medical University, Beijing, China.

Clinical Hemorheology and Microcirculation
|January 4, 2013
PubMed
Summary

Higher hematocrit levels are linked to slow coronary flow (SCF) in patients with near-normal arteries. This suggests increased hematocrit may play a role in the development of SCF.

Keywords:
Hematocritrisk factorsslow coronary flow

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Related Experiment Videos

Last Updated: May 15, 2026

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
06:39

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

Published on: April 13, 2015

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice
05:07

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice

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Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Area of Science:

  • Cardiology
  • Vascular Biology
  • Hematology

Background:

  • The role of hematocrit in the development of slow coronary flow (SCF) remains unclear.
  • SCF is characterized by reduced blood flow in coronary arteries despite a lack of significant obstructive lesions.

Purpose of the Study:

  • To investigate the association between hematocrit levels and the prevalence and severity of SCF.
  • To determine if hematocrit is an independent predictor of SCF.

Main Methods:

  • A study of 367 patients with angiographically near-normal coronary arteries.
  • Patients were stratified into four hematocrit quartiles.
  • Coronary flow velocity was assessed using the corrected thrombolysis in myocardial infarction frame count (TFC).

Main Results:

  • Higher hematocrit quartiles showed increased prevalence of SCF, particularly in the left anterior descending artery (LAD).
  • Hematocrit was positively correlated with corrected TFC for the LAD, indicating slower flow.
  • Multivariate analysis confirmed hematocrit as a significant correlate of SCF in the LAD after adjusting for confounders.

Conclusions:

  • Elevated hematocrit is positively associated with slower coronary flow in the LAD.
  • Increased hematocrit may be a contributing factor to the pathophysiology of SCF.