[Infective endocarditis]

Area of Science:

• Cardiology
• Infectious Diseases
• Microbiology

Context:

• Infective endocarditis (IE) involves microorganism colonization of native cardiac valves or polymer implants, leading to severe prognostically unfavorable disease.
• Gram-positive bacteria are the primary causative agents, with Streptococci, Staphylococci, and Enterococci being most frequent.
• Clinical findings include fever and valve regurgitant murmurs; elevated white blood cell count, ESR, and CRP support diagnosis.

Purpose:

• To outline diagnostic criteria and treatment strategies for infective endocarditis, emphasizing timely intervention for improved outcomes.
• To highlight the importance of accurate pathogen identification and antimicrobial susceptibility testing.
• To define optimal duration of antimicrobial therapy and indications for surgical intervention.

Summary:

• Diagnosis relies on blood cultures (at least three, aerobic and anaerobic) and echocardiography (TTE, followed by TEE if needed), especially for polymer-associated endocarditis (PIE).
• Quantitative antibiotic susceptibility testing is mandatory, guiding treatment with appropriate minimum inhibitory concentrations and synergistic combinations.
• Standard treatment involves 4-week antimicrobial therapy, extended to 6 weeks for PIE or complicated cases. Urgent surgery is indicated for uncontrolled infection, embolism, or severe valve dysfunction.

Impact:

• Timely and adequate diagnosis and treatment are paramount for improving the overall prognosis of infective endocarditis.
• Adherence to recommended treatment durations and surgical interventions can reduce recurrent infections and prevent severe complications.
• This approach ensures effective management of a life-threatening condition, particularly in cases involving cardiac implants.