Related Experiment Video

Updated: Oct 2, 2026

Full-root Aortic Valve Replacement by Stentless Aortic Xenografts in Patients with Small Aortic Roots
12:17

Full-root Aortic Valve Replacement by Stentless Aortic Xenografts in Patients with Small Aortic Roots

Published on: May 21, 2017

Pericardial stentless aortic valves: effects of sizing on hemodynamics and root geometry

X Y Jin1, S Westaby

  • 1Department of Cardiac Surgery, Oxford Heart Centre, Oxford Radcliffe Hospitals, Oxford, UK.

Seminars in Thoracic and Cardiovascular Surgery
|January 24, 2002
PubMed

Insights

A new sizing policy for pericardial stentless valves, using annulus diameter plus 3-4 mm, significantly improves hemodynamic performance and aortic root geometry. This approach enhances valve competence and efficiency, particularly beneficial for elderly patients.

Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Optimal sizing of pericardial stentless valves is crucial for effective hemodynamic performance.
  • Previous sizing policies may lead to suboptimal outcomes due to geometric mismatch.
  • Aortic root geometry and distensibility play a significant role in valve function.

Purpose of the Study:

  • To evaluate the impact of a revised valve sizing policy on hemodynamic performance.
  • To assess the effects of the new sizing policy on aortic root geometry.
  • To compare outcomes between two different sizing strategies for pericardial stentless valves.

Main Methods:

  • Retrospective analysis of 103 patients undergoing pericardial stentless valve implantation.
  • Group A (n=48): valve size based on annulus diameter + 1-2 mm.
  • Group B (n=55): valve size based on annulus diameter + 3-4 mm, with surgical aortic root remodeling.

Main Results:

  • Group B patients received larger valves (7% increase) with significantly lower mean pressure gradients (38% decrease).
  • Group B demonstrated a greater effective orifice area (32% increase) and improved aortic root distensibility (9.3% vs 6.8%).
  • Group B experienced a lower incidence of prosthesis regurgitation (0.35 vs 0.89 grade).

Conclusions:

  • Sizing pericardial stentless aortic valves using annulus diameter plus 3-4 mm enhances valve competence and hemodynamic efficiency.
  • This revised sizing policy improves aortic root geometry and distensibility, leading to better patient outcomes.
  • The findings suggest a potential advantage for this sizing strategy in elderly patients with geometric root mismatch.

More Related Videos

Standardized Technique of Aortic Valve Re-implantation for Valve-sparing Aortic Root Replacement14:14

Standardized Technique of Aortic Valve Re-implantation for Valve-sparing Aortic Root Replacement

Published on: December 11, 2017

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...
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...
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...
Mitral Stenosis III: Medical Management01:26

Mitral Stenosis III: Medical Management

Mitral stenosis, a condition marked by the narrowing of the mitral valve, necessitates an integrated approach for effective management. This approach includes preventative measures, medical therapy, and surgical interventions to reduce symptoms and prevent complications.PreventionPrevention of mitral stenosis primarily focuses on reducing the incidence of bacterial infections, particularly streptococcal infections, which can lead to rheumatic fever and subsequent valvular damage. Timely...
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...
Heart Valves01:16

Heart Valves

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...