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Related Concept Videos

Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Cardiomyopathy I: Introduction and Classification01:25

Cardiomyopathy I: Introduction and Classification

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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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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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Structure of Cardiac Muscles01:13

Structure of Cardiac Muscles

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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
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Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Myocarditis I: Introduction01:21

Myocarditis I: Introduction

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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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Related Experiment Video

Updated: Oct 13, 2025

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

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Cardiac Pathology in Myotonic Dystrophy Type 1.

Mani S Mahadevan1, Ramesh S Yadava1, Mahua Mandal1

  • 1Department of Pathology, University of Virginia, Charlottesville, VA 22908, USA.

International Journal of Molecular Sciences
|November 13, 2021
PubMed
Summary
This summary is machine-generated.

Myotonic dystrophy type 1 (DM1) significantly impacts the heart, causing conduction defects and arrhythmias. Understanding cardiac pathology and management is crucial for affected individuals.

Keywords:
RNA fociRNA splicingRNA toxicityantisense oligonucleotidescardiac conductioncardiac pathologyfatty infiltrationfibrosismyotonic dystrophysudden deathtriplet repeat mutation

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Area of Science:

  • Cardiology
  • Genetics
  • Neuromuscular Disorders

Background:

  • Myotonic dystrophy type 1 (DM1) is a multi-systemic disorder affecting various organs, including the heart.
  • Cardiac involvement is a primary concern in DM1, leading to significant morbidity and mortality.
  • Cardiac conduction defects affect up to 75% of adult DM1 patients, with arrhythmias being a common cause of death.

Purpose of the Study:

  • To review the cardiac pathology associated with Myotonic dystrophy type 1.
  • To discuss clinical manifestations, pathogenesis, and diagnostic tools for cardiac issues in DM1.
  • To provide an overview of current management guidelines for DM1 cardiac complications.

Main Methods:

  • Literature review of cardiac studies in DM1.
  • Analysis of clinical manifestations and pathological findings.
  • Discussion of emerging data on cardiac magnetic resonance imaging (CMR) and RNA toxicity models.

Main Results:

  • Cardiac involvement is a hallmark of DM1, with high prevalence of conduction defects.
  • Sudden cardiac death due to arrhythmias is a major concern in DM1.
  • Cardiac magnetic resonance imaging (CMR) shows promise as a biomarker for cardiac disease in DM1.

Conclusions:

  • The pathogenesis of cardiac manifestations in DM1 requires further elucidation.
  • Cardiac magnetic resonance imaging (CMR) may serve as a valuable biomarker for DM1 cardiac disease.
  • Adherence to updated clinical guidelines is essential for managing cardiologic aspects of DM1.