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Related Concept Videos

Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

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...
Allosteric Proteins-ATCase01:19

Allosteric Proteins-ATCase

Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

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...
Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

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...
Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

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...
Aneurysm I: Introduction01:30

Aneurysm I: Introduction

An aortic aneurysm is a localized outpouching or dilation at a weak point in the artery wall. It may involve different parts of the aorta, such as the abdominal aorta, aortic arch, or thoracic aorta.Etiological factorsSeveral disorders are associated with aortic aneurysms.Congenital causes, such as primary connective tissue disorders like Marfan syndrome, impact the integrity and strength of connective tissues, notably affecting the aorta. Marfan syndrome is a genetic disorder that specifically...

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Related Experiment Video

Updated: Jul 6, 2026

A Rabbit Aortic Valve Stenosis Model Induced by Direct Balloon Injury
07:10

A Rabbit Aortic Valve Stenosis Model Induced by Direct Balloon Injury

Published on: March 31, 2023

Aortic valve stenosis due to alkaptonuria.

Martin Brueck1, Dirk Bandorski, Wilfried Kramer

  • 1Department of Cardiology, Hospital of Wetzlar, Wetzlar, Geramny. Martin.Brueck@hkw.med.uni-giessen.de

The Journal of Heart Valve Disease
|March 28, 2008
PubMed
Summary

Alkaptonuria (AKU) can cause severe cardiovascular disease, including aortic valve stenosis and coronary artery disease. This case highlights the need for cardiac monitoring in AKU patients, demonstrating successful surgical intervention.

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Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro
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Last Updated: Jul 6, 2026

A Rabbit Aortic Valve Stenosis Model Induced by Direct Balloon Injury
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Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro
05:47

Isolation of Mouse Interstitial Valve Cells to Study the Calcification of the Aortic Valve In Vitro

Published on: May 10, 2021

Area of Science:

  • Cardiology
  • Rare Diseases
  • Metabolic Disorders

Background:

  • Alkaptonuria (AKU), a rare inherited metabolic disorder, is primarily known for ochronosis, leading to joint degeneration and tissue pigmentation.
  • Cardiovascular complications, particularly aortic valve disease, are increasingly recognized but less understood aspects of AKU.
  • Early diagnosis and management are crucial for mitigating long-term health consequences.

Observation:

  • A 69-year-old male with diagnosed AKU presented with symptoms of shortness of breath and exertional chest pain.
  • Clinical examination revealed characteristic signs of ochronosis, including urine coloration, skin pigmentation, and arthropathy.
  • Cardiac investigations identified severe aortic valve stenosis and concurrent coronary artery disease.

Findings:

  • Operative findings confirmed ochronosis affecting a severely calcified aortic valve and the aortic intima.
  • The patient successfully underwent surgical correction, including biological aortic valve replacement (AVR) and coronary artery bypass grafting (CABG).

Implications:

  • This case underscores the significant cardiovascular burden associated with alkaptonuria.
  • It emphasizes the importance of comprehensive cardiac evaluation and proactive management in patients with AKU.
  • Timely surgical intervention can effectively address severe valvular and coronary pathologies in AKU patients.