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Related Concept Videos

Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

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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...
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Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

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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...
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Aortic Regurgitation IV: Nursing Management01:17

Aortic Regurgitation IV: Nursing Management

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A nurse managing a patient with aortic regurgitation begins with a comprehensive assessment, including a review of the patient's medical history, family history, and lifestyle factors. During the cardiac examination, the nurse listens for heart sounds and checks for signs of valve abnormalities. The nurse also observes for symptoms such as dyspnea, orthopnea, and paroxysmal nocturnal dyspnea and assesses the patient's endurance and daily activity tolerance.Based on the findings, the nurse...
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Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

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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...
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Hypothesis: Accept or Fail to Reject?01:17

Hypothesis: Accept or Fail to Reject?

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The outcome of any hypothesis testing leads to rejecting or not rejecting the null hypothesis. This decision is taken based on the analysis of the data, an appropriate test statistic, an appropriate confidence level, the critical values, and P-values. However, when the evidence suggests that the null hypothesis cannot be rejected, is it right to say, 'Accept' the null hypothesis?
There are two ways to indicate that the null hypothesis is not rejected. 'Accept' the null...
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Heart Valves01:16

Heart Valves

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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...
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Standardized Technique of Aortic Valve Re-implantation for Valve-sparing Aortic Root Replacement
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Transcatheter Aortic Valve Replacement for a Failed Mechanical Aortic Prosthesis.

Joseph Nader1, Jean-Michel Paradis2, Omar Zainulabdin1

  • 1Department of Cardiac Surgery, Quebec Heart and Lung Institute, Laval University, Quebec City, Canada.

The Annals of Thoracic Surgery
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For high-risk patients with small aortic roots, reoperation for a faulty mechanical aortic prosthesis is challenging. Transcatheter aortic valve replacement via open aorta on cardiopulmonary bypass offers a viable solution.

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Area of Science:

  • Cardiovascular Surgery
  • Interventional Cardiology
  • Prosthetic Valve Technology

Background:

  • Reoperative surgery for dysfunctional aortic prostheses, especially in small aortic roots, presents significant challenges for high-risk individuals.
  • Mechanical aortic prostheses can fail, necessitating further intervention, which is complex in patients with limited surgical options.

Observation:

  • A Jehovah's Witness patient with a failing 17-mm mechanical aortic prosthesis and a small aortic root required reoperation.
  • The patient's specific conditions (Jehovah's Witness, small aortic root, mechanical prosthesis failure) limited traditional surgical re-do options.

Findings:

  • Transcatheter aortic valve replacement (TAVR) was successfully performed via an open aorta approach while on cardiopulmonary bypass.
  • This technique minimized operative duration and mitigated the risk of prosthesis-patient mismatch.

Implications:

  • This case demonstrates the feasibility of TAVR in a complex, high-risk scenario previously considered to have limited options.
  • Open-approach TAVR may be a valuable alternative for select patients requiring aortic valve reoperation, particularly those with specific religious beliefs or anatomical constraints.