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Infective endocarditis caused by Streptococcus mutans. A complication of idiopathic hypertrophic subaortic stenosis
Abstract:
Three patients with endocarditis caused by Streptococcus mutans were seen during a six-month period. All had clinical features of subacute bacterial endocarditis, including fever, heart murmurs, and positive blood cultures. One had underlying aortic insufficiency and two had idiopathic hypertrophic subaortic stenosis. All patients were treated with parenteral antibiotics and were cured. Streptococcus mutans is a pleomorphic, microaerophilic organism that is associated with dental caries and plaque. Differentiation of S mutans from enterococcal endocarditis is important because the former condition can be treated for a shorter period of time with penicillin alone, without the addition of aminoglycoside antibiotics.
Insights
Subacute bacterial endocarditis caused by Streptococcus mutans can be cured with antibiotics. Differentiating it from enterococcal endocarditis allows for shorter treatment durations.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Subacute bacterial endocarditis (SBE) is a serious infection of the heart valves.
- Streptococcus mutans, commonly associated with dental caries, can cause SBE.
- Identifying the causative agent is crucial for appropriate treatment protocols.
Observation:
- Three cases of SBE caused by Streptococcus mutans were observed over six months.
- Patients presented with typical SBE symptoms: fever, heart murmurs, and positive blood cultures.
- Underlying conditions included aortic insufficiency and idiopathic hypertrophic subaortic stenosis.
Findings:
- All three patients with Streptococcus mutans endocarditis achieved a cure following parenteral antibiotic therapy.
- Streptococcus mutans is a pleomorphic, microaerophilic bacterium.
- Successful treatment was achieved with antibiotics alone, without the need for aminoglycosides.
Implications:
- Distinguishing Streptococcus mutans endocarditis from enterococcal endocarditis is clinically significant.
- Shorter antibiotic treatment durations may be possible for S. mutans endocarditis.
- This highlights the importance of microbiological identification in guiding therapeutic strategies for infective endocarditis.