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Factors Associated with Mortality in Nosocomial Lower Respiratory Tract Infections: an ENIRRI Analysis

Antibiotics (Basel, Switzerland)(2025)

School of Medicine | Médecine Intensive-Réanimation | NOVA Medical School | Intensive Care | Hospital Joan XXIII de Tarragona | "Dr Fran Mihaljevic" University Hospital for Infectious Diseases | Medical Faculty | Hospital Nacional Alejandro Posadas | Hospital del Mar | Hospital Arnau de Vilanova de Lleida | ASST Santi Paolo e Carlo | Chest Department | St James's University Hospital

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Abstract
Background: Nosocomial lower respiratory tract infections (nLRTIs) are associated with unfavorable clinical outcomes and significant healthcare costs. nLRTIs include hospital-acquired pneumonia (HAP), ventilator-associated pneumonia (VAP), and other ICU-acquired pneumonia phenotypes. While risk factors for mortality in these infections are critical to guide preventive strategies, it remains unclear whether they vary based on their requirement of invasive mechanical ventilation (IMV) at any point during the hospitalization. Objectives: This study aims to identify risk factors associated with short- and long-term mortality in patients with nLRTIs, considering differences between those requiring IMV and those who do not. Methods: This multinational prospective cohort study included ICU-admitted patients diagnosed with nLRTI from 28 hospitals across 13 countries in Europe and South America between May 2016 and August 2019. Patients were selected based on predefined inclusion and exclusion criteria, and clinical data were collected from medical records. A random forest classifier determined the most optimal clustering strategy when comparing pneumonia site acquisition [ward or intensive care unit (ICU)] versus intensive mechanical ventilation (IMV) necessity at any point during hospitalization to enhance the accuracy and generalizability of the regression models. Results: A total of 1060 patients were included. The random forest classifier identified that the most efficient clustering strategy was based on ventilation necessity. In total, 76.4% of patients [810/1060] received IMV at some point during the hospitalization. Diabetes mellitus was identified to be associated with 28-day mortality in the non-IMV group (OR [IQR]: 2.96 [1.28–6.80], p = 0.01). The 90-day mortality-associated factor was MDRP infection (1.98 [1.13–3.44], p = 0.01). For ventilated patients, chronic liver disease was associated with 28-day mortality (2.38 [1.06–5.31] p = 0.03), with no variable showing statistical and clinical significance at 90 days. Conclusions: The risk factors associated with 28-day mortality differ from those linked to 90-day mortality. Additionally, these factors vary between patients receiving invasive mechanical ventilation and those in the non-invasive ventilation group. This underscores the necessity of tailoring therapeutic objectives and preventive strategies with a personalized approach.
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critical care,mechanical ventilation,nosocomial lower respiratory tract infections
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要点】:本研究分析了医院获得性下呼吸道感染患者的死亡风险因素,发现28天和90天死亡的风险因素不同,且是否需要侵袭性机械通气对风险因素有显著影响。

方法】:采用跨国前瞻性队列研究方法,收集了欧洲和南美洲13个国家28家医院ICU病房中诊断为医院获得性下呼吸道感染的患者的临床数据,并使用随机森林分类器确定最佳聚类策略。

实验】:共纳入1060名患者,通过随机森林分类器分析,确定了基于是否需要机械通气作为最有效的聚类策略。结果显示,糖尿病与未接受机械通气患者28天死亡风险相关,多重耐药菌感染与90天死亡风险相关;对于接受机械通气的患者,慢性肝病与28天死亡风险相关。数据集名称未在文中提及。