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Endocarditis I: Introduction

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Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...

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Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...

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Related Experiment Video

Updated: May 25, 2026

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Unusual endocarditis: "rare bug, rare site".

Ankur Lodha¹, Evbu Enakpene, Mehandi Haran

¹Division of Cardiology, Maimonides Medical Center, Brooklyn, New York 11219, USA.

The American Journal of the Medical Sciences

|January 25, 2012

Summary

This summary is machine-generated.

This case study highlights a rare instance of infective endocarditis caused by Streptococcus agalactiae in a non-IV drug user. The patient presented with large vegetations on both the mitral valve and a ventricular septal defect, affecting both heart sides.

Related Experiment Videos

Last Updated: May 25, 2026

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Area of Science:

Cardiology
Infectious Diseases
Pathology

Background:

Infective endocarditis (IE) is an infection of the heart's inner lining or valves.
Streptococcus agalactiae (Group B Streptococcus) is an uncommon pathogen causing IE, particularly in non-intravenous drug users (non-IVDUs).
Ventricular septal defects (VSDs) are rare sites for vegetation development in IE.

Observation:

A 27-year-old male presented with symptoms of infective endocarditis.
Echocardiography revealed large vegetations on the anterior mitral valve leaflet and the right ventricular side of a membranous VSD.
Blood cultures confirmed Streptococcus agalactiae as the causative agent.

Findings:

The patient had simultaneous involvement of the left and right sides of the heart due to IE.
This represents a unique presentation of IE with extensive vegetations on both a heart valve and a VSD.
This is the first reported case of simultaneous left and right-sided IE in a non-IVDU caused by Streptococcus agalactiae.

Implications:

This case expands the understanding of Streptococcus agalactiae's potential to cause severe, complex infective endocarditis.
It underscores the importance of considering rare pathogens and unusual locations for vegetations in diagnosing IE, even in non-IVDUs.
The findings highlight the need for thorough cardiac evaluation in suspected IE cases, especially when VSDs are present.