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Related Concept Videos

Overview of the Heart01:07

Overview of the Heart

The heart, a muscular organ located in the chest, functions as the body's pump, circulating blood through the vascular system. It has four chambers: two atria on top and two ventricles below. The right atrium receives deoxygenated blood from the body and passes it to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and transfers it to the left ventricle, which pumps it to the rest of the body.
The heart's structure...
Heart Valves01:16

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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
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Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Heart Failure I: Introduction01:27

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Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...

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Autologous human tissue-engineered heart valves: prospects for systemic application.

Anita Mol1, Marcel C M Rutten, Niels J B Driessen

  • 1Clinic for Cardiovascular Surgery, University Hospital Zürich, Zürich, Switzerland. a.mol@tue.nl

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Summary

This study developed tissue-engineered human heart valves using saphenous vein cells and a synthetic scaffold. These living aortic valve replacements show promising tissue properties and mechanical behavior for future clinical applications.

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Cardiovascular Research

Background:

  • Tissue engineering offers a promising solution for creating living heart valve replacements.
  • Current research primarily focuses on pulmonary valve replacements in animal models.
  • Developing tissue-engineered heart valves for systemic use with human cells remains a significant challenge.

Purpose of the Study:

  • To create autologous tissue-engineered heart valves using human cells for potential aortic valve replacement.
  • To evaluate the impact of bioreactor conditioning on tissue development and mechanical properties.
  • To assess the functional performance of engineered valves under physiological flow conditions.

Main Methods:

  • Utilized human saphenous vein cells seeded onto a rapidly degrading synthetic scaffold.
  • Compared tissue development and mechanical properties between static culturing and dynamic bioreactor conditioning.
  • Exposed engineered valves to simulated physiological aortic valve flow to assess leaflet motion.

Main Results:

  • Tissue formation and mechanical properties improved over 4 weeks of culturing, particularly with bioreactor conditioning.
  • Dynamic conditioning enhanced tissue organization and anisotropic properties.
  • Engineered valves exhibited proper opening during simulated flow, but suboptimal closure dynamics were observed.
  • Suboptimal closure was attributed to a lower degree of tissue anisotropy compared to native aortic valve leaflets.

Conclusions:

  • Successfully developed autologous tissue-engineered heart valves using human saphenous vein cells and a biodegradable scaffold.
  • The observed tissue properties and mechanical behavior suggest potential for use as living aortic valve replacements.
  • Further optimization of tissue anisotropy is needed to fully replicate native aortic valve function.