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Related Concept Videos

Amyloid Fibrils03:03

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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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

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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 IV: Restrictive Cardiomyopathy01:29

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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 III: Hypertrophic Cardiomyopathy01:29

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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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Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

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Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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Cardiac Amyloid, The Great Imitator.

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Cardiac amyloidosis can mimic cardiac sarcoidosis, leading to misdiagnosis even with advanced imaging. Endomyocardial biopsy is crucial for accurate diagnosis and appropriate treatment of infiltrative cardiac disease.

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Area of Science:

  • Cardiology
  • Infiltrative Cardiac Diseases

Background:

  • Endomyocardial biopsy (EMB) is the gold standard for diagnosing infiltrative cardiac disease.
  • Noninvasive diagnosis of cardiac sarcoidosis (CS) or cardiac amyloidosis relies on clinical suspicion and advanced imaging like cardiac magnetic resonance imaging (CMR) and cardiac positron emission tomography (PET).

Observation:

  • A 79-year-old male with mediastinal sarcoidosis presented with chest pain and right bundle branch block, initially suggesting CS.
  • CMR and PET imaging supported a CS diagnosis, but EMB revealed transthyretin amyloid cardiomyopathy.
  • The patient improved after treatment with tafamidis.

Findings:

  • Cardiac amyloidosis can present as cardiac sarcoidosis, leading to misdiagnosis with conventional diagnostic methods.
  • Advanced noninvasive imaging (CMR, PET) can be misleading in differentiating CS from amyloidosis.

Implications:

  • Accurate diagnosis of infiltrative cardiac disease is critical to avoid inappropriate treatments like steroids for CS.
  • Endomyocardial biopsy remains essential for definitive diagnosis, especially when noninvasive findings are equivocal.