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Quantification, Viability Assessment, and Visualization Strategies for Acinetobacter Biofilms
Published on: August 4, 2023
[Factors associated with mortality in Acinetobacter baumannii infected intensive care unit patients]
Abstract:
Acinetobacter baumannii can survive for prolonged periods in unsuitable environmental conditions and easily spread to patients in the hospital settings leading to healthcare-associated infections. Major risk factors for A.baumannii infections are mechanical ventilation, invasive procedures such as central venous catheter or urinary catheter and the use of broad-spectrum antibiotics. The mortality rates of nosocomial A.baumannii infections have been reported between 50-60%, changing due to several factors. The aim of this study was to investigate the factors associated with mortality in intensive care unit (ICU) patients diagnosed as nosocomial A.baumannii infections. The demographical, clinical and microbiological data of the patients who were followed in ICUs between September 2008 to March 2010 were evaluated retrospectively, and analyzed regarding the factors related to mortality. Blood, urine and tracheal aspirate samples were collected from suspected patients and cultivated on conventional agar media. The identification of the isolates and antibiotic susceptibilities were performed by using VITEK-2 (bioMerieux, USA) automated system. The patients with A.baumannii infections were grouped as "died" and "survived" cases, and the groups were compared according to following factors: age, gender, isolation day of bacteria in intensive care unit, type of clinical sample, implementation day of the central venous catheter, implementation of tracheotomy and/or intubation, operation, presence of diabetes mellitus, antibiotic use, day of hospitalization, day of mechanical ventilation and APACHE (Acute Physiology and Chronic Health Evaluation)-II score. A.baumannii infection was identified in 56 patients (29 female, 27 male; mean age: 63 years) in the intensive care units during the study period, and the total mortality rate was estimated as 77% (43/56). The implementation of intubation, mechanical ventilation, high APACHE II score and recovery of bacteria from respiratory tract were found statistically significant for A.baumannii infections related mortality (p< 0.05 for each parameter). Our data showed that Acinetobacter infection in the respiratory tract, implementation of intubation, mechanical ventilation and high APACHE II scores were the major risk factors related to mortality.
Insights
Acinetobacter baumannii infections in intensive care units have a high mortality rate. Key risk factors include respiratory tract infection, intubation, mechanical ventilation, and high APACHE II scores.
Area of Science:
- Infectious Diseases
- Critical Care Medicine
- Microbiology
Background:
- Acinetobacter baumannii is a resilient pathogen causing healthcare-associated infections, particularly in intensive care units (ICUs).
- Risk factors for Acinetobacter baumannii infections include mechanical ventilation, invasive procedures, and broad-spectrum antibiotic use, contributing to significant mortality rates.
- This study retrospectively analyzed clinical and microbiological data from ICU patients between 2008 and 2010 to identify factors associated with mortality from nosocomial Acinetobacter baumannii infections.
Discussion:
- The study identified intubation, mechanical ventilation, respiratory tract isolation of Acinetobacter baumannii, and high APACHE II scores as significant predictors of mortality.
- These findings highlight the critical role of respiratory support and disease severity in Acinetobacter baumannii-related deaths within the ICU setting.
- The high overall mortality rate of 77% underscores the severity of these infections and the need for effective prevention and management strategies.
Key Insights:
- Respiratory tract Acinetobacter baumannii infections are strongly associated with increased mortality in ICU patients.
- Implementation of intubation and mechanical ventilation are significant risk factors contributing to Acinetobacter baumannii-related deaths.
- Elevated APACHE II scores indicate a higher risk of mortality among patients with Acinetobacter baumannii infections.
Outlook:
- Further research should focus on developing targeted interventions to mitigate the risks associated with mechanical ventilation and intubation in Acinetobacter baumannii-infected patients.
- Investigating novel therapeutic strategies and infection control measures is crucial to reduce the high mortality rates associated with Acinetobacter baumannii in ICUs.
- Longitudinal studies are needed to evaluate the long-term impact of Acinetobacter baumannii infections and the effectiveness of interventions in critical care settings.
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