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Cardiomyopathy V: Interprofessional Care01:29

Cardiomyopathy V: Interprofessional Care

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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Myocarditis III: Medical Management01:14

Myocarditis III: Medical Management

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Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

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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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Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

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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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Cardiomyocyte-Derived Apelin Rescues Viral Myocarditis-Induced Cardiac Lymphatic Dysfunction and Remodeling.

Yuan-Nan Lin1, Jing Xu1, Yi-Hao Wu1

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Summary
This summary is machine-generated.

Coxsackievirus B3-induced acute viral myocarditis impairs cardiac lymphatic vessels (CLVs). Apelin overexpression in heart cells improves CLV function, reducing inflammation and enhancing cardiac repair in this viral myocarditis model.

Keywords:
apelincardiac lymphangiogenesisdrainageinflammationviral myocarditis

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Area of Science:

  • Cardiovascular Biology
  • Lymphatic System Research
  • Virology

Background:

  • Cardiac lymphatic vessels (CLVs) are crucial for resolving inflammation.
  • The role of CLVs in coxsackievirus B3-induced acute viral myocarditis (AVMC) is not well understood.

Purpose of the Study:

  • To investigate the function of CLVs in AVMC.
  • To explore the therapeutic potential of apelin in improving CLV function during AVMC.

Main Methods:

  • AVMC was induced in mice.
  • Cardiac lymphangiogenesis and drainage were assessed.
  • Apelin was overexpressed in cardiomyocytes.
  • In vitro studies examined apelin's effect on lymphatic endothelial cell junctions and signaling pathways.
  • Vascular endothelial growth factor receptor 3 (VEGFR3) was blocked to assess lymphatic defects.

Main Results:

  • AVMC led to pathological cardiac lymphangiogenesis and impaired CLV drainage, causing heart inflammation and dysfunction.
  • Apelin overexpression in cardiomyocytes enhanced CLV integrity and drainage, reducing inflammation and improving cardiac function.
  • Apelin stabilized lymphatic endothelial cadherin and zonula occludens 1 via the AKT signaling pathway in vitro.
  • Pre-existing lymphatic defects partially negated the benefits of apelin overexpression.

Conclusions:

  • Functional CLVs, restored by cardiomyocyte-derived apelin, facilitate inflammation resolution and improve cardiac function in AVMC.
  • CLV-based therapeutic strategies show promise for treating AVMC-associated heart damage.