title: Influence of gentamicin dosing interval on the efficacy of penicillin-containing regimens in experimental Enterococcus faecalis endocarditis.
abstract: The influence of the gentamicin dosing regimen was studied in experimental Enterococcus faecalis endocarditis. After inoculation, animals received penicillin, or penicillin plus once-daily gentamicin, or penicillin plus thrice-daily gentamicin, or no treatment. After the treatment period, bacterial densities within the vegetations (mean +/- SEM) were 6.06 +/- 0.30, 5.42 +/- 0.29, 4.98 +/- 0.10 and 9.97 +/- 0.16 log cfu/g for the four groups. All regimens produced significant reductions in bacterial density when compared with controls; penicillin plus thrice-daily gentamicin resulted in a significant difference from penicillin alone. Although once-daily regimens have proved effective in trials involving other organisms, such regimens do not appear to be so optimal for the treatment of enterococcal endocarditis.
authors.affiliation: Department of Pharmacy, Hartford Hospital, CT 06102, USA.
authors.forename: M N
authors.initials: MN
authors.lastname: Marangos
authors.forename: D P
authors.initials: DP
authors.lastname: Nicolau
authors.forename: R
authors.initials: R
authors.lastname: Quintiliani
authors.forename: C H
authors.initials: CH
authors.lastname: Nightingale
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D004696:Endocarditis / Q000188:drug therapy* / Q000382:microbiology; D013293:Enterococcus faecalis / Q000187:drug effects*; D005839:Gentamicins / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics; D016908:Gram-Positive Bacterial Infections / Q000188:drug therapy*; D008826:Microbial Sensitivity Tests; D010406:Penicillins / Q000494:pharmacology* / Q000627:therapeutic use; D011817:Rabbits
chemical_list: D005839:Gentamicins; D010406:Penicillins