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Related Concept Videos

Myocarditis I: Introduction01:21

Myocarditis I: Introduction

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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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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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
Myocarditis III: Medical Management01:14

Myocarditis III: Medical Management

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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Related Experiment Video

Updated: Jun 19, 2026

Transthoracic Echocardiographic Examination in the Rabbit Model
14:46

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Published on: June 1, 2019

SYPHILITIC MYOCARDITIS IN THE RABBIT.

W H Brown1, L Pearce

  • 1Laboratories of The Rockefeller Institute for Medical Research.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Researchers discovered granulomatous myocarditis in rabbits infected with Treponema pallidum. This finding represents the first reported instance of syphilitic myocarditis in rabbits, offering new insights into visceral syphilis.

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Area of Science:

  • Veterinary Pathology
  • Infectious Diseases
  • Cardiovascular Pathology

Background:

  • Treponema pallidum is the causative agent of syphilis.
  • Syphilitic myocarditis is a known manifestation in humans, characterized by granulomatous inflammation.
  • Animal models are crucial for understanding syphilis pathogenesis and developing treatments.

Purpose of the Study:

  • To report the first cases of granulomatous myocarditis in rabbits infected with Treponema pallidum.
  • To describe the gross and microscopic features of these lesions.
  • To evaluate the potential of this finding as a model for studying syphilitic myocarditis.

Main Methods:

  • Routine postmortem examinations of rabbits infected with Treponema pallidum.
  • Gross pathological examination of cardiac lesions.
  • Histopathological analysis of myocardial tissue, comparing findings to human syphilitic myocarditis.

Main Results:

  • Six cases of pronounced granulomatous myocarditis were identified in infected rabbits.
  • Lesions measured 1.0 cm or more in diameter.
  • Histological features were consistent with human syphilitic myocarditis, although treponemata were not directly demonstrated in the lesions.

Conclusions:

  • The observed myocarditis in rabbits is strongly suggestive of syphilitic myocarditis.
  • These findings represent the first documented cases of syphilitic myocarditis and visceral syphilis in rabbits.
  • This rabbit model may offer a valuable platform for further research into the cardiovascular manifestations of syphilis.