Bacterial and Human Biomarkers of Prognostic Value for Severe Legionnaire's Disease
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 300
- 试验地点
- 23
- 主要终点
- Legionnaire's disease severity measured by SOFA/PELOD score
研究概览
简要总结
Legionnaires' disease (LD) is a relatively common pneumonia in France (1200 cases/year), 98% of cases are hospitalized and 40% require intensive care unit (ICU) admission. Risk factors that may predispose to acquisition of LD are well known. Some studies suggest that genetic factor may also enhance susceptibility to LD.
The mortality rate remains high (10% to 33% in ICUs) despite improved diagnostic and therapeutic management of patients. Few prospective studies have assessed the factors associated with LD outcomes, particularly death, and most of them involved a limited number of patients.
In a multicentre cohort study, the investigators recently identified risk factors associated with higher mortality such as female sex, age, ICU stay, renal failure, corticosteroid treatment and enhanced pro-inflammatory status, as assessed by higher C-reactive protein level (PMID: 22005914). Other factors are suspected but their involvement has not been formally demonstrated including a high infectious bacterial load, particular virulence of Legionella strain, and an in vivo selection of mutants resistant to prescribed antibiotics. Disease progression is highly variable from one patient to another, and usually remains unpredictable. There are no objective criteria to predict the prognosis of these patients.
The clinical course of patients with LD remains difficult to predict because no predictive biomarkers have yet been characterized and the demonstration of the presence of mutants to antibiotics in vivo has never been done.
The main objective of the study is to correlate the L. pneumophila load (detected by PCR) to the clinical outcome of the LD infection. Clinical severity will measured by the SOFA score (Sepsis -Related Organ Failure Assessment) or the PELOD score (Pediatric Logistic Organ Dysfunction).
Secondary objectives are to identify new host and bacterial biomarkers associated with poor outcome of LD.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Diagnostic
- 盲法
- None
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Adult patients with medical and biological signs of legionnaires' disease.
- •Pediatric patients regardless of age but with a minimum weight of 7.5 kg with medical and biological signs of legionnaires' disease.
- •Patient and/or his/her legal representative have reviewed the patient information/informed consent form and have given written informed consent.
排除标准
- •None Legionella pneumophila Legionnaires' disease.
- •Patients for whom respiratory secretions can't be obtained.
- •Cases diagnosed only by serology.
- •Outpatients.
结局指标
主要结局
Legionnaire's disease severity measured by SOFA/PELOD score
时间窗: At Hospital Output, on average 1 Day
No other specific timeframe could be provided, it will depend on patients' condition. The study will evaluate correlation between the L. pneumophila load (quantify by molecular method) to the clinical outcome of the LD infection
Bacterial load measured by PCR
时间窗: At Hospital Output, on average 1 Day
No other specific timeframe could be provided, it will depend on patients' condition. The study will evaluate correlation between the L. pneumophila load (quantify by molecular method) to the clinical outcome of the LD infection
次要结局
- Pulmonary microbiota(At inclusion, up to 48 hours)
- Genomic analyzes(At inclusion, up to 48 hours)
- Specific cytokine profile(Up to Day 5)