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Related Concept Videos

Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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...
Mitral Regurgitation III: Medical Management01:25

Mitral Regurgitation III: Medical Management

Mitral regurgitation (MR) is characterized by retrograde blood circulation from the left ventricle into the left atrium due to inadequate mitral valve closure. The severity of the condition, symptoms, and underlying cause determine treatment strategies.Monitoring and Pharmacological TreatmentPatients with mild to moderate MR typically do not need immediate intervention but regular monitoring to assess progression and guide treatment. Patients with mild MR should have an echocardiogram every 3-5...
Mitral Valve Prolapse I: Introduction01:27

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
Mitral Regurgitation II: Clinical Features and Diagnostic Tests01:23

Mitral Regurgitation II: Clinical Features and Diagnostic Tests

Mitral regurgitation (MR) is a valvular heart disorder in which the mitral valve fails to close tightly, allowing blood to leak backward into the heart. Understanding the clinical manifestations, assessment, diagnostic findings, and medical management of MR is crucial to effectively managing affected patients.Clinical Manifestations of Mitral RegurgitationMitral regurgitation can be acute or chronic, each presenting differently and requiring different approaches:1. Acute Mitral...
Mitral Valve Prolapse II: Assessment and Management01:22

Mitral Valve Prolapse II: Assessment and Management

IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular tachycardia.

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Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery
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On the left ventricular vortex reversal after mitral valve replacement.

Gianni Pedrizzetti1, Federico Domenichini, Giovanni Tonti

  • 1D.I.C.A., University of Trieste, Trieste, Italy. giannip@dica.units.it

Annals of Biomedical Engineering
|January 23, 2010
PubMed
Summary

Prosthetic valve implants can reverse left ventricle blood flow, turning normal vortical motion into reversed rotation. This change increases energy loss and may lead to new health issues, impacting surgical procedures.

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Medical Device Design

Background:

  • The human left ventricle normally exhibits vortical blood flow to aid circulation.
  • Prosthetic heart valves are implanted to restore cardiac function.
  • Understanding blood flow dynamics post-implantation is crucial for patient outcomes.

Purpose of the Study:

  • To investigate the impact of prosthetic valve implantation on left ventricular blood flow patterns.
  • To determine if prosthetic valves can reverse the natural vortical motion of blood.
  • To explore the physiological consequences of altered blood flow dynamics.

Main Methods:

  • Utilized computational fluid dynamics (CFD) modeling.
  • Simulated blood flow within a left ventricle model with a prosthetic valve.
  • Analyzed flow patterns, energy dissipation, and pressure distribution.

Main Results:

  • Prosthetic valve implantation can completely reverse the natural vortical blood flow in the left ventricle.
  • The reversed rotation is primarily linked to the symmetry of the prosthetic valve implant.
  • Altered flow dynamics lead to increased energy dissipation and modified pressure gradients.

Conclusions:

  • Reversed blood flow post-prosthetic valve implantation is a significant phenomenon with clinical implications.
  • The findings suggest that prosthetic valve design symmetry influences hemodynamic alterations.
  • Results offer a basis for improving surgical techniques and prosthetic valve design to mitigate adverse effects.