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Single-antibiotic therapy for streptococcal endocarditis.

A W Karchmer, R C Moellering, D G Maki

    JAMA
    |April 27, 1979
    PubMed
    Summary
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    Penicillin G potassium is an effective single-drug therapy for nonenterococcal streptococcal endocarditis, showing high survival and low relapse rates. This study highlights penicillin

    Area of Science:

    • Infectious Diseases
    • Cardiology
    • Pharmacology

    Background:

    • Nonenterococcal streptococcal endocarditis poses significant treatment challenges.
    • Optimal antibiotic regimens for this condition require further investigation.

    Purpose of the Study:

    • To evaluate the efficacy of single-drug antibiotic therapy for nonenterococcal streptococcal endocarditis.
    • To compare outcomes of penicillin G potassium, cephalothin sodium, and vancomycin hydrochloride therapies.

    Main Methods:

    • A retrospective study of 99 patients with nonenterococcal streptococcal endocarditis.
    • Patients were treated with single-drug regimens: penicillin G potassium, cephalothin sodium, or vancomycin hydrochloride.
    • Serum bactericidal titers were assessed at the nadir of antibiotic concentration.

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    Main Results:

    • Eighty-six out of 99 patients survived; 66 received penicillin alone.
    • Penicillin monotherapy demonstrated no relapses among 66 patients.
    • High serum bactericidal titers (≥1:8) were achieved in 95% of patients assessed.

    Conclusions:

    • High-dose parenteral penicillin or a bactericidal penicillin substitute for ≥4 weeks is effective for penicillin-susceptible streptococcal endocarditis.
    • Single-drug therapy, particularly with penicillin, offers comparable bacteriologic cure rates to combination regimens.
    • Penicillin G potassium is a viable and effective treatment option for nonenterococcal streptococcal endocarditis.