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Related Experiment Videos

Bioactive antibiotic levels in the human aorta

D Mutch, G Richards, R A Brown

    Surgery
    |December 1, 1982
    PubMed
    Summary

    Cefazolin and cefoxitin achieved therapeutic aortic tissue levels in patients receiving prosthetic grafts. Clindamycin did not reach adequate levels, indicating potential efficacy differences for antibiotic prophylaxis in aortic surgery.

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    Area of Science:

    • Pharmacology
    • Surgical Infectious Disease
    • Cardiovascular Surgery

    Background:

    • Antibiotic prophylaxis is crucial in prosthetic graft surgery to prevent surgical site infections.
    • Determining optimal antibiotic choice requires understanding drug penetration into surgical tissues.
    • Aortic graft procedures carry a significant risk of infection, necessitating effective preventative strategies.

    Purpose of the Study:

    • To quantify the concentration of active antibiotic in aortic tissue following administration of cefazolin, clindamycin, or cefoxitin.
    • To compare the penetration of different antibiotics into the aortic wall in patients undergoing prosthetic graft surgery.
    • To assess the correlation between serum antibiotic levels and aortic tissue concentrations.

    Main Methods:

    • A novel bioassay was employed to measure antibiotic levels in aortic wall tissue.
    • Twenty-four patients undergoing elective aortic surgery with prosthetic grafts were enrolled.
    • Patients received cefazolin, clindamycin, or cefoxitin intravenously during anesthesia induction.

    Main Results:

    • Cefazolin and cefoxitin demonstrated satisfactory levels within the aortic wall tissue.
    • Clindamycin failed to achieve therapeutic concentrations in the aortic wall.
    • A poor correlation was observed between systemic blood levels and local aortic tissue levels of the antibiotics.

    Conclusions:

    • Cefazolin and cefoxitin appear to be suitable choices for antibiotic prophylaxis in aortic graft surgery based on tissue penetration.
    • Clindamycin may not provide adequate protection against infection in this surgical context due to insufficient tissue levels.
    • Monitoring serum antibiotic levels alone is insufficient for assessing therapeutic efficacy in aortic tissue.

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