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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...
14.9K
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...
1.1K
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

1.8K
Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
1.8K
Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

Mitral Stenosis II: Clinical features and Diagnostic Tests

557
Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
557
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...
1.6K
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

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Related Experiment Video

Updated: May 5, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
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Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

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Stenosed bicuspid aortic valves in twins.

D J Godden, P S Sandhu, F Kerr

    European Heart Journal
    |March 1, 1987
    PubMed
    Summary

    Genetic factors may influence bicuspid aortic valve development. This case study of identical twins suggests a hereditary component, though environmental influences are also significant for this congenital heart defect.

    Area of Science:

    • Cardiovascular Genetics
    • Congenital Heart Disease
    • Aortic Valve Disorders

    Background:

    • Bicuspid aortic valve (BAV) is a common congenital heart defect.
    • The etiology of BAV is not fully understood, with both genetic and environmental factors suspected.
    • Aortic stenosis is a frequent complication of BAV, necessitating intervention.

    Observation:

    • This report details a case of monozygotic (identical) twins.
    • Both twins presented with symptomatic bicuspid aortic valves.
    • Both required surgical aortic valve replacement due to severe aortic stenosis.

    Findings:

    • The concordant presentation of BAV and aortic stenosis in identical twins strongly suggests a significant genetic predisposition.
    • This case provides further evidence for a hereditary component in the pathogenesis of bicuspid aortic valve.

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    Biaxial Mechanical Characterizations of Atrioventricular Heart Valves
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  • The role of genetic factors in BAV development is supported, but not exclusively determined.

    • Implications:

    • Understanding the genetic basis of BAV can aid in risk stratification and genetic counseling.
    • Further research into specific genetic markers may elucidate BAV's complex etiology.
    • This case highlights the importance of considering hereditary factors in congenital cardiovascular anomalies.