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Related Concept Videos

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...
Aneurysm II: Clinical Manifestations and Diagnostic Studies01:21

Aneurysm II: Clinical Manifestations and Diagnostic Studies

Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
Atherosclerosis II: Clinical Manifestations and Diagnostic Tests01:27

Atherosclerosis II: Clinical Manifestations and Diagnostic Tests

Atherosclerosis is a progressive disorder that leads to the thickening and narrowing of arterial walls due to plaque buildup. This condition can cause various symptoms depending on the arteries affected:Coronary Artery Disease (CAD): This condition affects the coronary arteries and may lead to chest pain (angina), shortness of breath (dyspnea), heart attacks, and other heart disease symptoms.Cerebrovascular Disease: This affects blood flow to the brain, causing transient ischemic attacks (TIAs)...
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...
Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation01:21

Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation

Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...

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Echocardiographic Assessment of Cardiac Anatomy and Function in Adult Rats
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Segmental differences of aortic function and composition: clinical implications.

Dimitrios P Sokolis1, Harisios Boudoulas, Panayotis E Karayannacos

  • 1Foundation of Biomedical Research, Academy of Athens, Greece. dimitrissokolis@ath.forthnet.gr

Hellenic Journal of Cardiology : HJC = Hellenike Kardiologike Epitheorese
|June 12, 2008
PubMed
Summary

Aortic stiffness varies along the aorta, with distal segments being stiffer due to changes in elastin and collagen. Understanding these differences is crucial for assessing cardiovascular health.

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Histology

Background:

  • Aortic function significantly influences cardiovascular pressure and flow dynamics.
  • Segmental variations in aortic properties may have clinical relevance.

Purpose of the Study:

  • To investigate segmental differences in aortic function and composition.
  • To correlate these differences with clinical implications.

Main Methods:

  • Divided porcine thoracic and abdominal aortas into segments.
  • Analyzed stress-strain relationships to determine elastic modulus at different stress levels.
  • Performed linear and multiple regression analyses, including histologic examination.

Main Results:

  • Distal aortic segments showed increased stiffness (higher elastic modulus) at physiologic and high stress levels.
  • Proximal aorta had higher elastin concentrations, while distal aorta had higher collagen.
  • Aortic wall thickness decreased distally.
  • Elastic moduli correlated with elastin (part I) and collagen (part III).

Conclusions:

  • Aortic elastic properties and composition exhibit significant segmental variations.
  • These regional differences in the aorta are important for accurate clinical assessment of aortic function.