■一些研究表明,氨甲环酸(TXA),抗纤维蛋白溶解剂,降低术后感染率。最近的体外研究表明,TXA单独以及与万古霉素和庆大霉素的组合对某些葡萄球菌菌株具有协同作用。在本研究中,这种协同作用在葡萄球菌假体周围感染(PPI)患者和体内模型中得到验证.
■我们测试了19个临床菌株(5个金黄色葡萄球菌和14个凝固酶阴性葡萄球菌[CoNS])对10mg/ml单独的TXA以及与万古霉素和庆大霉素的连续稀释液的组合。使用标准化的微量滴定板法。使用井浊度的标准可视化计算最小抑制浓度(MIC)。我们还使用金黄色葡萄球菌(ATCC29213)鼠颅下PPI模型来比较TXA和庆大霉素与单独的TXA或庆大霉素在监测4天后的协同作用。对小鼠实施安乐死,并取出圆盘用于分析cfu/ml计数和细胞存活率。还使用扫描电子显微镜(SEM)分析了体外和体内样品的生物膜结构。
■当TXA与万古霉素或庆大霉素合用时,在研究的菌株中,MIC降低了30%。根据物种,单独使用万古霉素和庆大霉素以及与TXA联合使用对金黄色葡萄球菌菌株的MIC50是相同的。CoNS与万古霉素及其相应组合的情况也是如此,而庆大霉素和TXA,观察到MIC50降低(2次稀释)。此外,在体内模型中,用TXA和庆大霉素治疗的小鼠组的平均(SD)logcfu/ml和从植入物获得的细胞存活率低于仅用TXA或庆大霉素治疗的小鼠组。SEM图像也证实了我们在MIC降低的菌株中的发现,以及老鼠的植入物,仅使用庆大霉素或TXA处理的样品中生物膜占据的面积大于使用TXA庆大霉素处理的样品中生物膜占据的面积。
■我们确认TXA与万古霉素或庆大霉素的组合具有协同作用。然而,这只发生在选定的菌株。
UNASSIGNED: Several studies have shown that tranexamic acid (TXA), an antifibrinolytic, reduces postoperative infection rates. Recent in vitro research showed that TXA alone and in combination with vancomycin and gentamicin had a synergistic effect against some staphylococcal strains. In the present study, this synergistic effect was validated in samples from patients with staphylococcal periprosthetic infection (PPI) and in an in vivo model.
UNASSIGNED: We tested 19 clinical strains (5 Staphylococcus aureus and 14 coagulase-negative staphylococci [CoNS]) against 10 mg/ml TXA alone and in combination with serial dilutions of vancomycin and gentamicin. The standardized microtiter plate method was used. The minimal inhibitory concentration (
MIC) were calculated using standard visualization of well turbidity. We also used an S. aureus (ATCC29213) murine subcranial PPI model to compare the synergistic effect of TXA and gentamicin with that of TXA or gentamicin alone after 4 days of monitoring. The mice were euthanized, and disks were removed for analysis of cfu/ml counts and cell viability rate. Biofilm structure of both in vitro and in vivo samples was also analyzed using scanning electron microscopy (SEM).
UNASSIGNED: When TXA was combined with vancomycin or gentamicin, the
MIC decreased in 30% of the strains studied. According to species, the MIC50 for vancomycin and gentamicin alone and in combination with TXA against S. aureus strains was the same. This was also the case for CoNS with vancomycin and its corresponding combination, whereas with gentamicin and TXA, a reduction in MIC50 was observed (2 dilutions). In addition, in the in vivo model, the mean (SD) log cfu/ml and cell viability rate obtained from the implant was lower in the group of mice treated with TXA and gentamicin than in those treated only with TXA or gentamicin. SEM images also corroborated our findings in strains in which the
MIC was reduced, as well as the in the mice implants, with the area occupied by biofilm being greater in samples treated only with gentamicin or TXA than in those treated with TXA+gentamicin.
UNASSIGNED: We confirm that combining TXA with vancomycin or gentamicin exerts a synergistic effect. However, this only occurs in selected strains.