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Related Concept Videos

Overview of Systemic and Pulmonary Circulation01:15

Overview of Systemic and Pulmonary Circulation

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
The oxygenated blood is sent...
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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.
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...
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Overview of Systemic Arteries01:11

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The human body is a complex, well-organized machine, and at the heart of its operations lies the circulatory system. This network of blood vessels, which includes systemic arteries, plays a vital role in maintaining life by transporting nutrients, oxygen, and waste products to and from cells throughout the body.
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Imbalances in Cardiac Output01:26

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Blood Flow01:29

Blood Flow

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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.
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Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

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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.
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Related Experiment Video

Updated: Feb 28, 2026

Wireless Telemetry Device Implantation in a Fontan Ovine Model for Continuous and Long-Term Hemodynamic Monitoring
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Wireless Telemetry Device Implantation in a Fontan Ovine Model for Continuous and Long-Term Hemodynamic Monitoring

Published on: May 2, 2025

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Fontan Circulation over Time.

Djoeke Wolff1, Joost P van Melle2, Beatrijs Bartelds3

  • 1Center for Congenital Heart Diseases, Department of Pediatric Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.

The American Journal of Cardiology
|June 19, 2017
PubMed
Summary
This summary is machine-generated.

Functional status in Fontan circulation patients is impaired early and declines with age. Exercise capacity correlates with pulmonary function and cardiac parameters during exertion, not rest.

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Area of Science:

  • Cardiology
  • Pulmonology
  • Pediatric Cardiology

Background:

  • The Fontan circulation, a unique surgical repair for single-ventricle congenital heart defects, leads to impaired patient functional status.
  • Previous research has not fully integrated cardiac and pulmonary factors influencing functional status.
  • A comparison with age-related decline in exercise capacity in healthy individuals is missing.

Purpose of the Study:

  • To investigate the functional status of Fontan patients over time since surgery.
  • To identify cardiac and pulmonary determinants of functional status in this population.
  • To compare the decline in exercise capacity with that of healthy individuals.

Main Methods:

  • A single-center study included 85 Fontan patients (age ≥10 years) with adequate cardiopulmonary exercise testing.
  • Data collected included time since Fontan completion, New York Heart Association functional class, and peak oxygen uptake (VO2 index).
  • Multivariate analyses identified independent associations with functional status parameters.

Main Results:

  • Mean time since Fontan completion was 15 years; 42% were NYHA class I, 48% class II, and 9% class III.
  • Peak VO2 index was 58% of predicted, correlating with time since Fontan.
  • Peak VO2 (predicted) was independently associated with maximum heart rate, oxygen pulse, and forced expiratory volume in 1 second, but not resting cardiac output.

Conclusions:

  • Fontan patient functional status is impaired shortly after surgery and deteriorates gradually, mirroring natural aging.
  • Functional status is linked to pulmonary function and exercise-related cardiac parameters.
  • Conventional resting cardiac measurements do not predict functional status in Fontan patients.