Glew R H, Moellering R C
Antimicrob Agents Chemother. 1979 Jan;15(1):87-92. doi: 10.1128/AAC.15.1.87.
To assess the effect of protein binding by human serum on the synergistic interaction of penicillins with gentamicin, time-kill curves were determined for four penicillins alone and in combination with gentamicin against 10 blood isolates of enterococci. Killing curves demonstrated synergism with penicillin G plus gentamicin against all 10 strains in either broth or 50% human serum. In broth the combinations of nafcillin plus gentamicin and oxacillin plus gentamicin were synergistic against 10 of 10 strains and 4 of 10 strains, respectively. However, in serum, nafcillin plus gentamicin was synergistically bactericidal against only two strains and oxacillin plus gentamicin against none. Methicillin plus gentamicin was synergistic against none of the enterococci in either medium. Thus, the semisynthetic, penicillinase-resistant penicillins are unlikely to be effective in the therapy of patients with enterococcal endocarditis.
为评估人血清蛋白结合对青霉素与庆大霉素协同相互作用的影响,测定了四种青霉素单独及与庆大霉素联合作用于10株肠球菌血培养分离株的时间杀菌曲线。杀菌曲线表明,在肉汤或50%人血清中,青霉素G加庆大霉素对所有10株菌株均显示协同作用。在肉汤中,萘夫西林加庆大霉素及苯唑西林加庆大霉素的联合用药分别对10株中的10株及10株中的4株有协同作用。然而,在血清中,萘夫西林加庆大霉素仅对两株有协同杀菌作用,苯唑西林加庆大霉素则无协同杀菌作用。在两种培养基中,甲氧西林加庆大霉素对肠球菌均无协同作用。因此,半合成的、耐青霉素酶的青霉素不太可能有效治疗肠球菌性心内膜炎患者。