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Mitral valve prolapse and bacterial endocarditis: when is antibiotic prophylaxis necessary?
American Heart Journal
|March 1, 1985
Summary
Mitral valve prolapse (MVP) increases bacterial endocarditis (BE) risk fivefold, but the absolute risk remains low. Antibiotic prophylaxis is generally unnecessary for MVP patients, except for those with systolic murmurs.
Area of Science:
- Cardiology
- Infectious Diseases
Background:
- Mitral valve prolapse (MVP) is a common valvular heart condition.
- Bacterial endocarditis (BE) is a serious infection of the heart valves.
Purpose of the Study:
- To investigate the association between MVP and the risk of developing BE.
- To determine the necessity of antibiotic prophylaxis for MVP patients.
Main Methods:
- A case-control study comparing 56 BE patients with 168 controls.
- Echocardiography was used to diagnose MVP.
- Patients without other known cardiovascular risk factors for BE were selected.
Main Results:
- MVP was present in 20% of BE cases versus 4% of controls (Odds Ratio 5.3).
- Preexisting systolic murmurs were common in MVP patients with BE.
- Repeated vascular instrumentation independently increased BE risk (Odds Ratio 6.2).
Conclusions:
- MVP significantly increases BE risk, but the absolute risk is small.
- Routine antibiotic prophylaxis is not recommended for most MVP patients.
- Prophylaxis may be considered for MVP patients with systolic murmurs.