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Related Concept Videos

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Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
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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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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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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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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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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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Related Experiment Video

Updated: Feb 28, 2026

Post-Myocardial Infarction Heart Failure in Closed-chest Coronary Occlusion/Reperfusion Model in G&#246;ttingen Minipigs and Landrace Pigs
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Testosterone deficiency prevents left ventricular contractility dysfunction after myocardial infarction.

R F Ribeiro Júnior1, K S Ronconi1, I C G Jesus2

  • 1Department of Physiological Sciences, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.

Molecular and Cellular Endocrinology
|June 14, 2017
PubMed
Summary

Testosterone deficiency protected against heart dysfunction after myocardial infarction (MI) in rats. Suppressed testosterone improved cardiac contractility and calcium handling, while replacement worsened outcomes.

Keywords:
Cardiac contractionExcitation-contraction couplingMyocardial infarctionSERCA-2aTestosterone

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In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
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Area of Science:

  • Cardiology
  • Endocrinology
  • Physiology

Background:

  • Testosterone influences myocardial contractility.
  • Testosterone replacement therapy (TRT) may negatively impact cardiac function post-myocardial infarction (MI).

Purpose of the Study:

  • To investigate the effect of testosterone deficiency on cardiac contractility following MI.
  • To evaluate the impact of testosterone replacement on cardiac function in the context of MI.

Main Methods:

  • Male Wistar rats underwent orchidectomy and/or MI.
  • Papillary muscle contractility and ventricular myocyte calcium handling were assessed.
  • Key calcium handling proteins (SERCA-2a, PLB, CAMKII) were analyzed.

Main Results:

  • Orchidectomy preserved cardiac contractility after MI.
  • Testosterone replacement in orchidectomized rats with MI worsened contractility.
  • Orchidectomy increased myocyte calcium transient amplitude and SERCA-2a expression.
  • Testosterone replacement reduced PLB phosphorylation and increased CAMKII phosphorylation.

Conclusions:

  • Testosterone deficiency may prevent MI-induced cardiac dysfunction.
  • Altered calcium handling proteins are implicated in the protective effects of testosterone deficiency.
  • Testosterone replacement therapy warrants careful consideration in post-MI patients.