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Updated: Jul 28, 2025

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia
Published on: June 28, 2018
Antimicrobial Resistance in Ventilator-Associated Pneumonia: Predictive Microbiology and Evidence-Based Therapy
1Department of Microbiology, College of Medicine, King Fahad Hospital of the University, Imam Abdulrahman Bin Faisal University, Dammam, Kingdom of Saudi Arabia. amalnimr@iau.edu.sa.
Abstract:
Ventilator-associated pneumonia (VAP) is a serious intensive care unit (ICU)-related infection in mechanically ventilated patients that is frequent, as more than half of antibiotics prescriptions in ICU are due to VAP. Various risk factors and diagnostic criteria for VAP have been referred to in different settings. The estimated attributable mortality of VAP can go up to 50%, which is higher in cases of antimicrobial-resistant VAP. When the diagnosis of pneumonia in a mechanically ventilated patient is made, initiation of effective antimicrobial therapy must be prompt. Microbiological diagnosis of VAP is required to optimize timely therapy since effective early treatment is fundamental for better outcomes, with controversy continuing regarding optimal sampling and testing. Understanding the role of antimicrobial resistance in the context of VAP is crucial in the era of continuously evolving antimicrobial-resistant clones that represent an urgent threat to global health. This review is focused on the risk factors for antimicrobial resistance in adult VAP and its novel microbiological tools. It aims to summarize the current evidence-based knowledge about the mechanisms of resistance in VAP caused by multidrug-resistant bacteria in clinical settings with focus on Gram-negative pathogens. It highlights the evidence-based antimicrobial management and prevention of drug-resistant VAP. It also addresses emerging concepts related to predictive microbiology in VAP and sheds lights on VAP in the context of coronavirus disease 2019 (COVID-19).
Insights
Ventilator-associated pneumonia (VAP) is a critical ICU infection. This review details antimicrobial resistance risk factors, diagnostic tools, and management strategies for VAP, emphasizing Gram-negative pathogens.
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Microbiology
Background:
- Ventilator-associated pneumonia (VAP) is a frequent and serious intensive care unit (ICU) infection.
- VAP contributes significantly to antibiotic use and carries a high attributable mortality, especially with antimicrobial resistance.
- Effective antimicrobial therapy and microbiological diagnosis are crucial for managing VAP.
Purpose of the Study:
- To review risk factors for antimicrobial resistance in adult VAP.
- To discuss novel microbiological diagnostic tools for VAP.
- To summarize evidence-based antimicrobial management and prevention strategies for drug-resistant VAP.
Main Methods:
- Literature review focusing on VAP, antimicrobial resistance, and Gram-negative pathogens.
- Analysis of current evidence on resistance mechanisms and diagnostic approaches.
- Exploration of emerging concepts in predictive microbiology for VAP.
Main Results:
- Multidrug-resistant Gram-negative bacteria are a significant concern in VAP.
- Optimal microbiological sampling and testing for VAP remain areas of ongoing research.
- Evidence-based strategies for managing and preventing drug-resistant VAP are highlighted.
Conclusions:
- Understanding antimicrobial resistance mechanisms and employing timely microbiological diagnosis are vital for effective VAP treatment.
- Proactive management and prevention are essential to combat the growing threat of drug-resistant VAP.
- The review also touches upon VAP in the context of COVID-19 and predictive microbiology.
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