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M-mode echocardiographic observations during and after healing of active bacterial endocarditis limited to the mitral
Abstract:
Analysis of 99 M-mode echocardiograms recorded during and up to 144 months after healing of active bacterial endocarditis limited to the mitral valve in 27 patients disclosed the following: (1) Little to no change occurred in the echocardiographic size of the vegetations during the first 6 weeks after diagnosis and institution of appropriate antibiotic therapy unless a major systemic embolus occurred. (2) The echocardiographic size of the vegetations did not determine the amount of cardiac damage or dysfunction produced by the valvular infection. (3) The larger the vegetations by echocardiogram, the greater was the likelihood of a clinical event compatible with a systemic embolus. (4) The gravest prognostic sign yielded by the echocardiogram was evidence of rupture of chordae tendineae. (5) Although a useful adjunct to diagnosis before appropriate antibiotic therapy was instituted, once bacteriologic cure was achieved, the echocardiogram was of limited value in delineating an active from a heated vegetation. (6) The echocardiographic appearance of the vegetations was not determined by the type of infecting bacterium.
Insights
Echocardiograms show that mitral valve vegetation size doesn't predict cardiac damage in bacterial endocarditis. Larger vegetations increase systemic embolus risk, with ruptured chordae tendineae being the gravest sign.
Area of Science:
- Cardiology
- Infectious Diseases
- Medical Imaging
Background:
- Bacterial endocarditis affecting the mitral valve can lead to significant cardiac complications.
- M-mode echocardiography is a key diagnostic tool for assessing valvular heart disease.
Purpose of the Study:
- To analyze the role of echocardiography in evaluating mitral valve vegetations in bacterial endocarditis.
- To correlate echocardiographic findings with clinical outcomes and cardiac damage.
Main Methods:
- Analysis of 99 M-mode echocardiograms from 27 patients with healed bacterial endocarditis.
- Longitudinal follow-up up to 144 months post-treatment.
- Correlation of vegetation size and echocardiographic features with clinical events and cardiac dysfunction.
Main Results:
- Mitral valve vegetation size showed little change within 6 weeks of antibiotic therapy unless a systemic embolus occurred.
- Vegetation size did not correlate with the degree of cardiac damage or dysfunction.
- Larger vegetations were associated with a higher likelihood of systemic embolization.
- Rupture of chordae tendineae on echocardiogram was the most significant negative prognostic indicator.
- Echocardiography's value diminished in differentiating active from healed vegetations after bacteriologic cure.
- The echocardiographic appearance of vegetations was independent of the specific infecting bacterium.
Conclusions:
- Echocardiography is valuable for initial diagnosis and identifying high-risk features like ruptured chordae tendineae in mitral valve endocarditis.
- Vegetation size is a predictor of embolic events but not direct cardiac damage.
- Post-treatment echocardiography has limited utility in assessing active versus healed vegetations.