Laboratory aspects of infective endocarditis

Area of Science:

• Clinical microbiology
• Infectious diseases
• Medical diagnostics

Background:

• Infective endocarditis diagnosis is challenging due to non-specific symptoms.
• Blood cultures are primary diagnostic specimens, but isolation can be difficult for certain organisms.
• Staphylococci and streptococci are the most common causative agents, with established treatment protocols.

Purpose of the Study:

• To outline the critical role of the clinical laboratory in infective endocarditis management.
• To highlight laboratory methods for pathogen identification and antimicrobial susceptibility testing.
• To discuss the laboratory's contribution to therapeutic monitoring and assessing treatment efficacy.

Main Methods:

• Analysis of blood cultures for microbial identification.
• Serological testing for non-bacterial causes when initial cultures are negative.
• Determination of minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) for antibiotics.
• Measurement of serum bactericidal activity to assess in vivo efficacy.

Main Results:

• Staphylococci and streptococci account for over 90% of infective endocarditis cases.
• Established antimicrobial chemotherapy is available for most strains.
• Laboratory testing provides essential data for guiding and monitoring patient treatment.

Conclusions:

• The clinical laboratory is indispensable for accurate diagnosis and effective management of infective endocarditis.
• Comprehensive laboratory analysis, including pathogen identification and antimicrobial susceptibility testing, optimizes patient care.
• Therapeutic drug monitoring by the laboratory ensures the clinical efficacy of antibiotic treatments.