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Echocardiography in infective endocarditis. Lack of specificity in patients with valvular pathology
Insights
M-Mode echocardiography has limitations in diagnosing valvular vegetations, especially in patients with pre-existing valve disease. False positive results can occur, necessitating careful interpretation of echocardiograms in suspected infective endocarditis cases.
Area of Science:
- Cardiology
- Medical Imaging
- Infectious Diseases
Background:
- Infective endocarditis is a serious infection affecting heart valves.
- Echocardiography is a key diagnostic tool for infective endocarditis.
- The specificity of echocardiography in detecting valvular vegetations requires careful evaluation.
Purpose of the Study:
- To determine the specificity of M-Mode echocardiography in detecting valvular vegetations.
- To assess the impact of pre-existing valvular pathology on echocardiographic diagnosis.
- To evaluate inter-observer agreement in interpreting echocardiograms for suspected infective endocarditis.
Main Methods:
- M-Mode echocardiography was performed on 59 patients with suspected infective endocarditis on natural valves.
- Echocardiograms were independently reviewed by two blinded observers.
- Patient outcomes were used to establish the final diagnosis.
Main Results:
- Two out of 40 patients without infective endocarditis received false positive diagnoses (5% false positive rate).
- Both false positive cases involved patients with pre-existing valvular pathology, complicating interpretation.
- Inter-observer disagreement was noted in 8.5% of the studies.
Conclusions:
- Echocardiographic diagnosis of vegetations requires caution in patients with pre-existing valvular pathology.
- Pre-existing valve conditions can lead to false positive findings in echocardiography.
- Careful interpretation is crucial for accurate diagnosis of infective endocarditis using echocardiography.
Abstract:
59 patients with suspected infective endocarditis on a natural valve were studied by M-Mode echocardiography to determine the specificity of the ultrasonic technique in detecting valvular vegetations. All echocardiograms were read independently by two observers who were unaware of the final diagnosis. Among 40 patients who later proved not to have infective endocarditis, two (5%) were diagnosed by echocardiography as having either possible or probably vegetation by at least one observer. Both patients with a false positive diagnosis of vegetation had pre-existing valvular pathology, the presence of which greatly complicated the interpretation of the echocardiogram. Inter-observer disagreement occurred in 5 of the 59 studies (8.5%). The results of this study suggest that caution should be exerted in the echocardiographic diagnosis of vegetation in patients with pre-existing valvular pathology.