目的:本研究调查了不动杆菌的临床和抗菌特性。血液系统患者的血流感染(BSI)。30天死亡率和碳青霉烯类耐药不动杆菌属的危险因素。还确定了(CRA)BSI收购。
方法:我们回顾了40例不动杆菌属血液学患者。2013年至2022年期间,中国一家大型血液病医院的BSI。对剩余的CRA分离物进行全基因组测序。
结果:30天死亡率高达35%。不动杆菌属的血液病患者。BSI通常在多个部位出现严重的疾病和共同感染。所有菌株均对粘菌素敏感,CR占40.0%。多变量分析确定了与CRABSI获取相关的几个风险因素,包括之前在30天内接触碳青霉烯类抗生素和CRA定植。非常严重的再生障碍性贫血,耐四环素的不动杆菌。BSI,感染后未解决的中性粒细胞减少与30天死亡率密切相关.非幸存者通常表现为较高的中位数PCT和CRP水平和严重的并发症,例如颅内感染,心功能不全,呼吸衰竭,和严重的败血症或脓毒性休克。我们的研究还确定了不适当的经验性抗生素治疗是30天死亡率的独立预测因素(OR:11.234,95%CI:1.261-20.086,P=0.030)。这项研究首次报道了A.oleivorans是人类病原体,并鉴定其独特的奥沙林酶,OXA-325.
结论:当人体免疫力受损时,环境来源的非致病性物种会致病。我们的结果还强调了改善感染后中性粒细胞减少症的重要性,治疗严重的器官功能障碍,并给予适当的经验性抗生素治疗以降低该患者人群的死亡率。
OBJECTIVE: This
study investigated the clinical and antimicrobial characteristics of
Acinetobacter spp. bloodstream infection (BSI) in hematological patients. Risk factors for 30-day mortality and carbapenem-resistant
Acinetobacter spp. (CRA) BSI acquisition were also identified.
METHODS: We reviewed forty hematological patients with Acinetobacter spp. BSI in a large Chinese blood disease hospital between 2013 and 2022. The remaining CRA isolates were subjected to whole-genome sequencing.
RESULTS: The 30-day mortality rate was high at 35%. Hematological patients with
Acinetobacter spp. BSI often presented with severe conditions and co-infections at multiple sites. All strains were colistin-susceptible and 40.0% were CR. Multivariate analysis identified several risk factors associated with CRA BSI acquisition, including previous exposure to carbapenems within 30 days and CRA colonization. Very severe aplastic anaemia, tetracycline-resistant Acinetobacter spp. BSI, and unresolved neutropenia after infection were closely associated with 30-day mortality. Non-survivors often presented with higher median PCT and CRP levels and severe complications, such as intracranial infection, cardiac dysfunction, respiratory failure, and severe sepsis or septic shock. Our
study also identified inappropriate empirical antibiotic therapy as an independent predictor of 30-day mortality (OR: 11.234, 95% CI: 1.261-20.086, P = 0.030). This
study was the first to report A. oleivorans as a human pathogen, and to identify its unique oxacillinase, OXA-325.
CONCLUSIONS: An environment-originated non-pathogenic species can become pathogenic when the body\'s immunity is compromised. Our results also highlighted the importance of improving neutropenia after infection, treating severe organ dysfunction, and administering appropriate empirical antibiotic therapy to reduce mortality in this patient population.