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Cardiomyopathy II: Dilated Cardiomyopathy

Cardiomyopathy II: Dilated Cardiomyopathy

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,...

Cardiomyopathy I: Introduction and Classification

Cardiomyopathy I: Introduction and Classification

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...

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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...

Cardiomyopathy IV: Restrictive Cardiomyopathy

Cardiomyopathy IV: Restrictive Cardiomyopathy

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...

Cardiomyopathy V: Interprofessional Care

Cardiomyopathy V: Interprofessional Care

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...

Heart Failure II: Pathophysiology

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

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A Doxorubicin-Induced Murine Model of Dilated Cardiomyopathy In Vivo

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Published on: May 16, 2020

[Dilated cardiomyopathy].

Philipp Ehlermann¹, Hugo A Katus

¹Innere Medizin III-Kardiologie, Angiologie und Pneumologie, Universitätsklinikum Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany. philipp.ehlermann@med.uni-heidelberg.de

Herzschrittmachertherapie & Elektrophysiologie

|September 27, 2012

Summary

Dilated cardiomyopathy (DCM) often has a genetic basis. Genetic testing helps identify at-risk family members, with LMNA gene mutations indicating a high risk for sudden cardiac death.

Area of Science:

Cardiology
Genetics
Molecular Biology

Context:

Dilated cardiomyopathy (DCM) exhibits familial clustering in 20-50% of cases, suggesting a significant genetic contribution.
Over 40 genes are implicated, yet current genetic testing identifies causative mutations in only about 20% of familial DCM cases.
Family history evaluation and pedigree analysis are crucial for initial DCM diagnosis and identifying at-risk individuals.

Purpose:

To underscore the importance of family history in diagnosing dilated cardiomyopathy (DCM).
To highlight the limitations of current genetic testing in risk stratification for DCM, except for LMNA mutations.
To outline indications for implantable cardioverter-defibrillator (ICD) implantation in DCM patients.

Summary:

Genetic mutations are found in 20-50% of familial dilated cardiomyopathy (DCM) cases, involving over 40 genes.

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LMNA gene mutations are a notable exception, enabling risk stratification due to their association with sudden cardiac death.

ICD implantation is recommended for DCM patients with chronically reduced left ventricular ejection fraction (LVEF) <35% or specific asymptomatic criteria, following optimal medical therapy.

Impact:

Facilitates early identification and management of individuals at risk for genetic forms of DCM.
Emphasizes the critical role of clinical evaluation and family history alongside genetic testing in DCM diagnosis.
Provides clear guidelines for ICD implantation, potentially reducing sudden cardiac death in high-risk DCM populations.