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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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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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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.
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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: Apr 17, 2026

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Cardiac involvement in myotonic dystrophy.

Koroush Khalighi1, Archana Kodali2, Suman B Thapamagar2

  • 1Easton Hospital, Easton, PA, USA; koroushkhalighi@gmail.com.

Journal of Community Hospital Internal Medicine Perspectives
|February 7, 2015
PubMed
Summary

Myotonic dystrophy (DM) patients frequently experience cardiac issues, including dangerous arrhythmias. Early identification and intervention, such as prophylactic pacemaker placement, are crucial for managing the risk of sudden cardiac death in these individuals.

Keywords:
arrhythmiaelectrophysiology studyheart blockmyotonic dystrophysudden death

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Area of Science:

  • Cardiology
  • Genetics
  • Neuromuscular Disorders

Background:

  • Myotonic dystrophy (DM) is an inherited disorder affecting muscle proteins.
  • Cardiac involvement, including arrhythmias and cardiomyopathies, can be a primary manifestation of DM.
  • Sudden cardiac death is a significant risk in patients with DM.

Purpose of the Study:

  • To identify patients with DM.
  • To assess their risk for sudden cardiac death.

Main Methods:

  • Evaluated nine patients with DM using electrocardiograms (EKG) and 2-D echocardiograms.
  • Conducted electrophysiological (EP) studies on seven patients.
  • Assessed cardiac conduction abnormalities and arrhythmia risk.

Main Results:

  • Eight of nine DM patients showed EKG evidence of conduction abnormalities.
  • Five of seven patients undergoing EP studies had inducible ventricular tachycardia.
  • Two patients received pacemakers for complete heart block; two opted for monitoring.

Conclusions:

  • A substantial proportion of DM-related deaths are sudden, necessitating early identification of high-risk patients.
  • Prophylactic pacemaker implantation is recommended, even with minor conduction abnormalities.
  • EP studies are valuable for identifying patients who would benefit from invasive strategies.