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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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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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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Myocarditis I: Introduction01:21

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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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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Diffuse Myocardial Fibrosis and Diastolic Function in Aortic Stenosis.

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  • 1Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea.

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In patients with aortic stenosis, higher extracellular volume fraction (ECV) on cardiac MRI indicates more diffuse myocardial fibrosis, correlating with diastolic dysfunction and predicting worse clinical outcomes.

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Area of Science:

  • Cardiology
  • Radiology
  • Medical Imaging

Background:

  • Myocardial fibrosis is linked to left ventricular diastolic dysfunction (LVDD).
  • Data on noninvasively quantified fibrosis and its relation to LVDD, symptoms, and prognosis in aortic stenosis (AS) is limited.

Purpose of the Study:

  • To investigate the association between extracellular volume fraction (ECV) and LVDD in patients with AS.
  • To determine if ECV and LVDD predict clinical outcomes and symptoms in AS.

Main Methods:

  • 191 patients with moderate/severe AS and 30 controls underwent cardiac MRI (CMR) for ECV measurement.
  • LVDD was assessed via echocardiography; clinical outcomes included mortality or heart failure hospitalization.

Main Results:

  • Higher ECV quintiles correlated with increased LVDD prevalence, decreased myocardial relaxation, and elevated LV filling pressures.
  • Both ECV and LVDD predicted dyspnea and clinical events independently.
  • ECV provided incremental prognostic value beyond clinical factors and LV function.

Conclusions:

  • Diffuse myocardial fibrosis (ECV) is associated with LVDD in AS patients.
  • ECV and LVDD parameters offer complementary insights into dyspnea and prognosis.
  • Combined assessment of LVDD and ECV may better identify high-risk AS patients.