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Myocarditis I: Introduction01:21

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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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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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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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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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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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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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Myocardial Fibrosis in Athletes: Risk Marker or Physiological Adaptation?

Vasiliki Katsi1, Epameinondas Triantafyllou1, Christos Fragoulis1

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Excessive endurance exercise may cause myocardial fibrosis, a condition detectable by cardiac MRI. This fibrosis can be a risk marker for arrhythmias or a benign adaptation, requiring careful interpretation in athletes.

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Area of Science:

  • Cardiology
  • Sports Medicine
  • Medical Imaging

Background:

  • Endurance exercise offers cardiovascular benefits like improved longevity and metabolic health.
  • Excessive training can lead to adverse cardiac changes, including myocardial fibrosis, identified by late gadolinium enhancement (LGE) on cardiac magnetic resonance imaging (CMR).
  • Myocardial fibrosis in athletes presents a complex picture, potentially indicating arrhythmia risk or physiological remodeling.

Purpose of the Study:

  • To review the dual role of myocardial fibrosis in athletes.
  • To examine fibrosis as a risk marker versus a benign adaptation.
  • To discuss the diagnostic and clinical implications of fibrosis in endurance athletes.

Main Methods:

  • Review of existing literature on myocardial fibrosis in athletes.
  • Analysis of cardiac magnetic resonance imaging (CMR) findings, specifically late gadolinium enhancement (LGE).
  • Correlation of fibrosis patterns with clinical outcomes, including arrhythmias and sudden cardiac death.

Main Results:

  • Ultra-endurance athletes may show increased ventricular size and mass, with elevated cardiac biomarkers post-exercise.
  • Subepicardial/midmyocardial patchy LGE patterns in the left ventricle (LV) are associated with a higher incidence of malignant arrhythmias (22% in studies).
  • The interpretation of fibrosis can be complex, as it may represent pathological changes or adaptive remodeling.

Conclusions:

  • Myocardial fibrosis in athletes, particularly with specific LGE patterns, is a significant finding that requires careful risk stratification.
  • Mechanisms of fibrosis in athletes are not fully understood but may involve stress, inflammation, or plaque dynamics.
  • Further research is essential to clarify fibrosis mechanisms, refine diagnostic criteria, and ensure athlete safety while maximizing exercise benefits.