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Related Concept Videos

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 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 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...
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...
Aneurysm III: Interprofessional Care01:26

Aneurysm III: Interprofessional Care

Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...

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Related Experiment Video

Updated: May 9, 2026

Time-Resolved, Dynamic Computed Tomography Angiography for Characterization of Aortic Endoleaks and Treatment Guidance via 2D-3D Fusion-Imaging
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Inconsistent False Lumen Enhancement Predicts Late Aortic Events After Hemiarch Replacement in Acute Type A Aortic

Hidefumi Nishida1, Ryota Nakamura1, Rihito Tamaki1

  • 1Department of Cardiovascular Surgery, St. Luke's International Hospital, Tokyo, Japan.

The American Journal of Cardiology
|April 18, 2024
PubMed
Summary

A new score assessing false lumen enhancement inconsistency after aortic hemiarch replacement can predict late aortic events. Lower scores indicate reduced risk, suggesting this metric aids in patient risk stratification.

Keywords:
Hounsfield unitacute type A aortic dissectionpatent false lumenreoperation

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Area of Science:

  • Cardiovascular Surgery
  • Medical Imaging
  • Aortic Disease

Background:

  • Inconsistent enhancement in the patent false lumen after hemiarch replacement poses an uncertain risk for late aortic events.
  • Accurate prediction of these events is crucial for patient management and outcomes.

Purpose of the Study:

  • To investigate the impact of false lumen enhancement inconsistency on late aortic events following hemiarch replacement.
  • To determine a predictive cut-off value for a novel false lumen Hounsfield unit (HU) score.

Main Methods:

  • Fifty-five patients with a patent false lumen post-hemiarch replacement were analyzed.
  • Hounsfield unit (HU) measurements were taken in the aortic arch and descending aorta.
  • A false lumen HU score was calculated as |1 - (arch HU / descending aorta HU)| to quantify enhancement discrepancy.
  • Receiver operating characteristics (ROC) curve analysis identified the predictive cut-off value.

Main Results:

  • The ROC analysis identified a false lumen HU score cut-off of 0.345.
  • Patients with a score <0.345 (Group A, n=26) had a significantly lower 5-year cumulative incidence of late aortic events (7.8%) compared to those with a score ≥0.345 (Group B, n=29) (39.9%).
  • Baseline characteristics were similar between the groups, indicating the score's independent predictive value.

Conclusions:

  • The false lumen HU score is a potentially valuable tool for predicting late aortic events after hemiarch replacement.
  • This imaging-derived metric may aid in stratifying patients at higher risk for adverse aortic outcomes.