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The Aorta

The Aorta

The aorta is the largest artery in the human body. It originates from the left ventricle of the heart and extends down to the abdomen, where it splits into two smaller arteries. Structurally, it can be divided into four main parts: the ascending aorta, the aortic arch, the thoracic aorta, and the abdominal aorta.
The average diameter of the aorta is approximately 2-3 cm, but the size can vary depending on the section of the aorta and the individual's age, sex, and body size. The aorta is...

Aortic Regurgitation I: Introduction

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 Tests

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...

Aneurysm I: Introduction

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 Studies

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 Care

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: Jun 28, 2026

Manufacturing Abdominal Aorta Hydrogel Tissue-Mimicking Phantoms for Ultrasound Elastography Validation

Manufacturing Abdominal Aorta Hydrogel Tissue-Mimicking Phantoms for Ultrasound Elastography Validation

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Predictability of aortic dissection as a function of aortic diameter.

G Sütsch¹, R Jenni, L von Segesser

¹Department of Internal Medicine, University Hospital, Zürich, Switzerland.

European Heart Journal

|December 1, 1991

Summary

Patients with dilated ascending aorta face a high risk of type A dissection. Elective surgery is recommended before aortic diameter reaches 6 cm to reduce emergency surgery and mortality risks.

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An Approach to Point-Of-Care Ultrasound Evaluation of the Abdominal Aorta

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Area of Science:

Cardiovascular Surgery
Vascular Medicine
Diagnostic Imaging

Background:

Dilated ascending aorta is a risk factor for aortic dissection.
Predicting dissection in patients with ascending aortic dilation remains challenging.

Purpose of the Study:

To investigate the relationship between aortic diameter and the occurrence of type A dissection.
To evaluate the clinical course and outcomes in patients with dilated ascending aorta.

Main Methods:

Transthoracic echocardiography was used for diagnosis and measurement of aortic diameter in 73 patients.
Patients were categorized into two groups: 54 with type A dissection and 19 without.
Surgical and medical treatment outcomes were analyzed.

Main Results:

Mean and indexed aortic diameters were similar between patients with and without dissection.
A significant scatter in individual aortic diameters was observed in both groups.
In-hospital mortality was higher in emergency surgery (18%) and medically treated (57%) groups compared to elective surgery (5%).

Conclusions:

Patients with dilated ascending aorta have a substantial incidence of acute dissection, with unpredictable clinical courses.
Elective surgical repair is recommended before the ascending aorta reaches 6 cm to mitigate risks associated with emergency surgery and improve outcomes.