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Related Concept Videos

Heart Valves01:16

Heart Valves

14.9K
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.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
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Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

1.6K
IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
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Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

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Aortic regurgitation (AR) is when the aortic valve does not close or seal properly, leading to backward blood circulation from the aorta into the left ventricle during diastole. Common causes of AR include rheumatic heart disease, congenital valve defects, and aortic root dilation. Managing AR requires a multifaceted approach to alleviate symptoms, preserve left ventricular function, and address the underlying cause of the regurgitation. Patients with symptomatic AR or significant left...
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Aortic Regurgitation IV: Nursing Management01:17

Aortic Regurgitation IV: Nursing Management

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A nurse managing a patient with aortic regurgitation begins with a comprehensive assessment, including a review of the patient's medical history, family history, and lifestyle factors. During the cardiac examination, the nurse listens for heart sounds and checks for signs of valve abnormalities. The nurse also observes for symptoms such as dyspnea, orthopnea, and paroxysmal nocturnal dyspnea and assesses the patient's endurance and daily activity tolerance.Based on the findings, the nurse...
453
Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

1.2K
Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
1.2K
Mitral Valve Prolapse I: Introduction01:27

Mitral Valve Prolapse I: Introduction

1.1K
IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
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Related Experiment Video

Updated: May 2, 2026

Full-root Aortic Valve Replacement by Stentless Aortic Xenografts in Patients with Small Aortic Roots
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Prosthetic heart valves in the aortic position: engineering aspects.

Dylan Goode1, Ruby Dhaliwal1, Dahlia Mohammadi1

  • 1The Heart Valve Performance Laboratory, School of Engineering, Faculty of Applied Science, University of British Columbia, Kelowna, Canada.

Journal of Medical Engineering & Technology
|May 1, 2026
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Summary

Aortic valve disease requires better prostheses. Current mechanical heart valves (MHVs) have limitations, necessitating advancements in leaflet design and material science for improved patient outcomes and reduced complications.

Keywords:
Heart valveaortic valve replacementaortic valvesbioprosthetic heart valvecardiovascular engineeringfluid mechanicsmechanical heart valvemedical devicesprosthetic heart valves

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Materials Science

Background:

  • Aortic valve (AV) disease significantly contributes to cardiovascular morbidity, especially in aging populations.
  • Current AV replacement prostheses, including surgical and transcatheter options, do not fully replicate native AV function or durability without compromise.
  • This review focuses on prosthetic valves in the aortic position from an engineering viewpoint.

Purpose of the Study:

  • To critically evaluate various prosthetic heart valve technologies for the aortic position.
  • To examine the engineering principles, material selection, and fluid dynamics influencing mechanical heart valve (MHV) performance.
  • To identify limitations of current bileaflet mechanical heart valves (BMHVs) and suggest future development directions.

Main Methods:

  • Review of existing literature on prosthetic heart valves, focusing on MHVs and BMHVs.
  • Analysis of pathophysiology of aortic stenosis and regurgitation to contextualize replacement strategies.
  • Evaluation of bioprosthetic, mechanical, polymeric, homograft, autograft, and transcatheter valve technologies.
  • Discussion of fluid dynamics, material properties (titanium alloys, pyrolytic carbon), and blood-material interactions.

Main Results:

  • Contemporary BMHVs exhibit non-physiological flow patterns and necessitate lifelong anticoagulation.
  • Material selection (titanium alloys, pyrolytic carbon) impacts MHV mechanical and hemocompatibility properties.
  • Valve geometry and hinge design are critical factors in transvalvular flow, shear stress, and thrombogenicity.

Conclusions:

  • Despite advancements, current BMHVs have inherent limitations regarding flow dynamics and anticoagulation requirements.
  • Future prosthetic valve development must prioritize enhanced leaflet kinematics, optimized hinge mechanics, and improved hemocompatibility.
  • The goal is to better mimic native AV function and minimize thromboembolic risks for patients.