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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Mitral Stenosis I: Introduction01:22

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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...
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Cardiomyopathy II: Dilated Cardiomyopathy01:30

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Mitral Regurgitation I: Introduction01:20

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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...
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Aortic Regurgitation III: Medical Management01:25

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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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Pathophysiology of Heart Failure01:17

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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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Diastolic Dysfunction With Preserved Ejection Fraction After the Fontan Procedure.

Shahryar M Chowdhury1, Eric M Graham1, Carolyn L Taylor1

  • 1Division of Cardiology Department of Pediatrics Medical University of South Carolina Charleston SC.

Journal of the American Heart Association
|January 13, 2022
PubMed
Summary

Fontan patients with normal ejection fraction but abnormal diastolic function show reduced exercise capacity and poorer health status. Identifying diastolic dysfunction is key for managing heart failure with preserved ejection fraction (HFpEF) risk.

Keywords:
Fontandiastolic functionheart failuresingle ventricle

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Area of Science:

  • Pediatric Cardiology
  • Cardiovascular Physiology
  • Congenital Heart Disease

Background:

  • Heart failure phenotyping in single-ventricle Fontan patients, especially those with normal ejection fraction (EF), is complex.
  • Identifying patients at risk for heart failure with preserved ejection fraction (HFpEF) is crucial for timely intervention.

Purpose of the Study:

  • To identify Fontan patients with abnormal diastolic function and normal EF, who are at high risk for HFpEF.
  • To characterize the cardiac mechanics, exercise function, and functional health status of these patients.

Main Methods:

  • Utilized data from the Pediatric Heart Network Fontan Cross-sectional Study.
  • Defined abnormal diastolic function using the diastolic pressure:volume quotient (>90th percentile).
  • Categorized patients into control, systolic dysfunction (SD), and diastolic dysfunction (DD) groups.

Main Results:

  • Diastolic dysfunction (DD) patients exhibited higher arterial elastance (arterial stiffness) compared to controls.
  • DD patients demonstrated lower percent predicted peak VO2, indicating reduced exercise tolerance.
  • Both DD and SD groups reported lower Physical Functioning Summary Scores (FSS) than controls.

Conclusions:

  • Fontan patients with diastolic dysfunction and normal EF experience decreased exercise tolerance and functional health.
  • These patients also present with elevated arterial stiffness, highlighting a significant risk factor.
  • Early identification of diastolic dysfunction is feasible and essential for managing HFpEF risk in Fontan survivors.