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Time to Blood Culture Positivity as a Predictor of Clinical Outcome of Staphylococcus aureus Bloodstream Infection

机译:血培养阳性的时间可预测金黄色葡萄球菌血流感染的临床结果

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Few studies have assessed the time to blood culture positivity as a predictor of clinical outcome in bloodstream infections (BSIs). The purpose of this study was to evaluate the time to positivity (TTP) of blood cultures in patients with Staphylococcus aureus BSIs and to assess its impact on clinical outcome. We performed a historical cohort study with 91 adult patients with S. aureus BSIs. TTP was defined as the time between the start of incubation and the time that the automated alert signal indicating growth in the culture bottle sounded. Patients with BSIs and TTPs of culture of ≤12 h (n = 44) and >12 h (n = 47) were compared. Septic shock occurred in 13.6% of patients with TTPs of ≤12 h and in 8.5% of patients with TTP of >12 h (P = 0.51). A central venous catheter source was more common with a BSI TTP of ≤12 h (P = 0.010). Univariate analysis revealed that a Charlson score of ≥3, the failure of at least one organ (respiratory, cardiovascular, renal, hematologic, or hepatic), infection with methicillin-resistant S. aureus, and TTPs of ≤12 h were associated with death. Age, gender, an APACHE II score of ≥20 at BSI onset, inadequate empirical antibiotic therapy, hospital-acquired bacteremia, and endocarditis were not associated with mortality. Multivariate analysis revealed that independent predictors of hospital mortality were a Charlson score of ≥3 (odds ratio [OR], 14.4; 95% confidence interval [CI], 2.24 to 92.55), infection with methicillin-resistant S. aureus (OR, 9.3; 95% CI, 1.45 to 59.23), and TTPs of ≤12 h (OR, 6.9; 95% CI, 1.07 to 44.66). In this historical cohort study of BSIs due to S. aureus, a TTP of ≤12 h was a predictor of the clinical outcome.
机译:很少有研究评估血液培养阳性的时间作为血液感染(BSI)临床结果的预测指标。本研究旨在评估金黄色葡萄球菌 BSI患者血液培养的阳性时间(TTP),并评估其对临床结果的影响。我们对91名成年Sem患者进行了一项历史队列研究。金黄色的BSI。 TTP被定义为开始培养到指示培养瓶中生长的自动警报信号响起之间的时间。比较了BSI和TTP培养时间分别≤12 h( n = 44)和> 12 h( n = 47)的患者。 TTP≤12 h的患者中有13.6%发生败血症性休克,TTP> 12 h的患者中有8.5%( P = 0.51)。中心静脉导管来源更常见,BSI TTP≤12 h( P = 0.010)。单因素分析显示,Charlson评分≥3,至少一个器官(呼吸,心血管,肾脏,血液学或肝病)的衰竭,感染了耐甲氧西林的 S。金黄色素和TTP≤12 h与死亡有关。年龄,性别,BSI发作时APACHE II得分≥20,经验性抗生素治疗不足,医院获得的菌血症和心内膜炎与死亡率无关。多因素分析显示,医院死亡率的独立预测因子为Charlson评分≥3(优势比[OR]为14.4; 95%置信区间[CI]为2.24至92.55),感染了耐甲氧西林的 S。金黄色葡萄球菌(OR,9.3; 95%CI,1.45至59.23)和TTP≤12 h(OR,6.9; 95%CI,1.07至44.66)。在此历史队列研究中,由于 S而导致的BSI。金黄色葡萄球菌,TTP≤12 h是临床预后的指标。

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