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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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Pathophysiology of Cardiac Performance01:29

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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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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Cardiomyopathy I: Introduction and Classification01:25

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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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Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

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The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy...
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Related Experiment Video

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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
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52 Genetic Loci Influencing Myocardial Mass.

Pim van der Harst1, Jessica van Setten2, Niek Verweij3

  • 1Department of Cardiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Durrer Center for Cardiovascular Research, Netherlands Heart Institute, Utrecht, the Netherlands.

Journal of the American College of Cardiology
|September 24, 2016
PubMed
Summary

This study identified 52 genetic loci influencing heart size and QRS complex traits. These findings offer new insights into the genetic basis of myocardial mass and potential therapeutic targets for heart conditions.

Keywords:
QRSelectrocardiogramgenetic association studyheart failureleft ventricular hypertrophy

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Area of Science:

  • Cardiovascular Genetics
  • Molecular Cardiology
  • Genomics

Background:

  • Myocardial mass is crucial for cardiac function and hypertrophy.
  • Electrocardiogram (ECG) QRS complex reflects myocardial depolarization and mass.
  • Abnormal QRS traits indicate altered myocardial mass and conduction, linked to heart failure risk.

Purpose of the Study:

  • To identify genetic determinants of myocardial mass.
  • To understand the genetic basis of QRS complex traits.

Main Methods:

  • Genome-wide association meta-analysis of 4 QRS traits in 73,518 European ancestry individuals.
  • Extensive biological and functional assessments of identified genetic loci.
  • Candidate gene analysis and validation in model organisms and in vitro/in vivo studies.

Main Results:

  • Identified 52 genomic loci (32 novel) associated with QRS phenotypes (p < 1 × 10⁻⁸).
  • Enrichment in active cardiac genomic regions, suggesting roles in cardiac hypertrophy.
  • Highlighted 67 candidate genes preferentially expressed in cardiac tissue, with conserved functions in model organisms.

Conclusions:

  • Findings provide novel insights into genes and pathways controlling myocardial mass.
  • Identified genetic loci and candidate genes may represent future therapeutic targets for cardiovascular diseases.