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Related Concept Videos

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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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 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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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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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
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Rare Variant Genetics and Dilated Cardiomyopathy Severity: The DCM Precision Medicine Study.

Mark Hofmeyer1, Garrie J Haas2,3,4, Elizabeth Jordan2,5

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Advanced dilated cardiomyopathy (DCM) is linked to a higher likelihood of rare genetic variants. This discovery aids in assessing outcomes for DCM patients and their families.

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Area of Science:

  • Cardiovascular Genetics
  • Precision Medicine
  • Genomic Medicine

Background:

  • Dilated cardiomyopathy (DCM) is a genetic heart condition.
  • Advanced DCM necessitates advanced treatments like left ventricular assist devices (LVAD) or heart transplantation (HT).
  • The genetic basis of DCM is known, but its link to advanced disease stages remains understudied.

Purpose of the Study:

  • To investigate the association between rare genetic variants and advanced dilated cardiomyopathy (DCM).
  • To analyze genetic data in a diverse cohort to understand DCM severity.
  • To identify potential genetic risk factors for advanced DCM requiring LVAD/HT.

Main Methods:

  • Analyzed clinical and genetic data from 1198 patients in the US DCM Precision Medicine Study (2016-2021).
  • Classified DCM severity into advanced (LVAD/HT), moderate (ICD only), and mild (neither).
  • Assessed rare variants in 36 DCM genes, controlling for demographic, lifestyle, and comorbidity factors.

Main Results:

  • 26.2% of patients with LVAD/HT had pathogenic/likely pathogenic variants, versus 15.9% (ICD only) and 15.0% (neither).
  • Advanced DCM patients were more likely to have pathogenic/likely pathogenic rare variants (OR 2.3; 95% CI, 1.5-3.6) after adjustment.
  • Genetic findings did not differ significantly by ancestry or between ICD-only and no-device groups.

Conclusions:

  • Advanced DCM is associated with a higher prevalence of pathogenic/likely pathogenic rare variants in DCM genes.
  • These genetic findings may improve risk stratification for DCM patients.
  • Understanding genetic links can aid management strategies for DCM patients and their families.