Staphylococcal endocarditis in drug users. Clinical and microbiologic aspects.

Area of Science:

• Infectious Diseases
• Cardiology
• Microbiology

Background:

• Staphylococcal endocarditis is a serious infection, particularly in individuals with a history of parenteral drug abuse.
• Parenteral drug abuse is a significant risk factor for infective endocarditis, often involving the right side of the heart.

Purpose of the Study:

• To evaluate the clinical and microbiologic features of staphylococcal endocarditis in patients with a history of parenteral drug abuse.
• To identify predominant valve lesions, complications, and antibiotic sensitivities in this patient population.

Main Methods:

• Retrospective analysis of clinical data from 40 patients with staphylococcal endocarditis and a history of parenteral drug abuse.
• Microbiologic evaluation including phage typing and antibiotic sensitivity testing of staphylococcal isolates.
• Assessment of clinical outcomes, systemic complications, and reactions to therapy.

Main Results:

• The tricuspid valve was the predominant site of infection, with frequent pulmonary complications.
• Systemic complications (meningitis, glomerulonephritis, etc.) occurred in 33% of patients.
• A high incidence of reactions to methicillin sodium (30%) was observed. Group 3 staphylococci and specific phage types (6, 42E, 54, 75) exhibited increased resistance to penicillin.

Conclusions:

• Staphylococcal endocarditis in parenteral drug abusers predominantly involves the tricuspid valve and is associated with significant pulmonary and systemic complications.
• While certain staphylococcal strains show resistance to penicillin, clinical outcomes were not correlated with phage type, group, or antibiotic sensitivity.