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A practical approach to prosthetic valve endocarditis
Abstract:
Prosthetic valve endocarditis (PVE) is an infrequent but dread complication, occurring in 1 to 2% of patients both early (less than 60 days) and late postoperatively. Diagnosis is always (99%) possible by two sets of blood cultures, but occasional exogenous causes of bacteremia may cloud the diagnosis, as will culture-negative cases of PVE and skin contaminants. With obvious exogenous sources of bacteremia, achieving sterile blood cultures after eradication of the noncardiac source permits discontinuation of antibiotics after two weeks. When skin contaminants are suspected, withholding antibiotics and obtaining two sets of blood cultures is recommended, because the bacteremia with PVE is continuous. Preventive measures, including perioperative antibiotics, are warranted but will probably not significantly reduce the low incidence of infection already achieved. The major cause of improved survival in recent years is earlier operation (valve rereplacement). This has been demonstrated in the last ten years and is absolutely indicated for major heart failure, ongoing sepsis, fungous etiology, valve obstruction, new-onset heart block, and unstable prosthesis by fluoroscopy.
Insights
Prosthetic valve endocarditis (PVE) is a rare complication. Early diagnosis via blood cultures and prompt valve replacement surgery significantly improve survival rates for patients with PVE.
Area of Science:
- Cardiology
- Infectious Diseases
- Cardiac Surgery
Background:
- Prosthetic valve endocarditis (PVE) is an infrequent but serious complication following valve replacement surgery.
- It occurs in 1-2% of patients early or late postoperatively.
- Diagnosis can be challenging due to potential confounding factors like exogenous bacteremia, culture-negative cases, and skin contaminants.
Purpose of the Study:
- To review the diagnostic challenges and management strategies for prosthetic valve endocarditis (PVE).
- To highlight the importance of early surgical intervention in improving patient survival.
- To discuss preventive measures and their limited impact on the already low incidence of PVE.
Main Methods:
- Review of diagnostic criteria for PVE, emphasizing blood cultures.
- Discussion of management protocols based on the source of bacteremia (exogenous vs. skin contaminants).
- Analysis of factors influencing survival, particularly the role of earlier surgical intervention (valve rereplacement).
Main Results:
- Blood cultures are highly effective (99%) for diagnosing PVE.
- Management strategies vary depending on the source of infection, with specific antibiotic durations recommended.
- Earlier valve rereplacement surgery is the primary driver of improved survival in recent years.
Conclusions:
- Prompt diagnosis and appropriate management are crucial for PVE.
- Earlier surgical intervention is indicated in cases of heart failure, sepsis, fungal etiology, valve obstruction, heart block, or prosthesis instability.
- While preventive measures exist, their impact on reducing the low incidence of PVE is likely minimal.