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Updated: Oct 9, 2025
Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus MRSA in Rat
Published on: June 4, 2012
Comparing Echocardiographic Modalities in Native-Valve Infective Endocarditis Due to Methicillin-Resistant
James Livesay1, Tyler Coombes2, Jared Spoons2
1Department of Cardiovascular Medicine Fellowship, University of Tennessee Graduate School of Medicine, Knoxville, USA.
Background:
Methicillin-resistant Staphylococcus aureus (MRSA) infective endocarditis (IE) is associated with high morbidity and mortality. Current IE guidelines recommend transesophageal echocardiogram (TEE) over transthoracic echocardiogram (TTE) to diagnose infective endocarditis. Management of IE in people who inject drugs (PWID) in many medical centers is mainly conservative with prolonged intravenous antibiotics. Cardiac valve replacement in these patients remains controversial, given the high risk of reinfection. This study's purpose is to evaluate whether obtaining sequential TEE after TTE in PWID with MRSA native-valve IE changes the management plan in these patients.
Methods:
A retrospective cohort of patients who are 18 years of age or older and inject drugs with definite MRSA IE between 2013 and 2019 were studied. Their echocardiographic reports and overall management plans were reviewed.
Results:
One hundred and twenty-six patients met the inclusion criteria. TTE was performed in 121 patients and, of these patients, 69 (57%) had detectable valvular vegetations while 52 (43%) did not. Of the 52 patients with a negative TTE, 44 underwent TEE, 28 (53%) of which showed vegetation. A total of 18 (14%) patients underwent surgery. Of these, six (33%) patients had a positive TTE only, with no subsequent TEE. Ten (56%) patients had both a positive TTE and TEE, and two (11%) patients had a negative TTE but positive TEE.
Conclusion:
In this retrospective cohort, obtaining a sequential TEE after a TTE in PWID with proven MRSA native IE by modified Duke's criteria changed the management plan in two patients. The decision to perform a TEE in these patients needs to be individualized. Larger studies are needed to better evaluate the role of TEE in this patient population.
Insights
Sequential transesophageal echocardiograms (TEE) after transthoracic echocardiograms (TTE) in people who inject drugs with MRSA infective endocarditis (IE) rarely changed management. Individualized decisions for TEE are recommended for this patient group.
Area of Science:
- Cardiology
- Infectious Diseases
- Medical Imaging
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) infective endocarditis (IE) carries high morbidity and mortality.
- Transesophageal echocardiogram (TEE) is preferred over transthoracic echocardiogram (TTE) for IE diagnosis.
- Management of IE in people who inject drugs (PWID) often involves prolonged antibiotics, with valve replacement being controversial due to reinfection risks.
Purpose of the Study:
- To evaluate if sequential TEE after TTE in PWID with MRSA native-valve IE alters the management plan.
- To assess the diagnostic yield of TEE in MRSA IE patients with initially negative TTE findings.
Main Methods:
- Retrospective cohort study of adult PWID with definite MRSA IE (2013-2019).
- Review of echocardiographic reports (TTE and TEE) and patient management plans.
- Analysis of vegetation detection rates and impact on treatment decisions.
Main Results:
- Of 126 patients, 121 had TTE; 57% showed vegetations.
- In 52 patients with negative TTE, 44 had TEE, revealing vegetations in 53%.
- Only two patients (1.6%) had a management change solely due to sequential TEE findings.
Conclusions:
- Sequential TEE after TTE in PWID with MRSA native IE infrequently changes management.
- The decision to perform TEE in this population should be individualized.
- Larger studies are necessary to clarify the role of TEE in MRSA IE among PWID.
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Types of Echocardiography
Transthoracic Echocardiography (TTE)
TTE is the most common type of echocardiogram which involves placing a transducer on the patient's chest, emitting sound waves to create heart images. TTE is invaluable for evaluating the heart's size, structure, and motion, making it particularly useful for...