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Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia
Published on: June 28, 2018
Current Concepts in Community and Ventilator Associated Lower Respiratory Tract Infections in ICU Patients
1Department of Anaesthesia and Critical Care Medicine, St James's Hospital, D08 X4RX Dublin, Ireland.
Abstract:
It is widely known that pneumonia (either community acquired or hospital acquired, as like ventilator associated pneumonia (VAP)), is the most frequent type of severe infection and continues to pose a significant burden on healthcare services worldwide. Despite new diagnostic developments, most pneumonia cases continue to be difficult to diagnose clinically, partly due to acquired antibiotic resistance and the lack of a 'gold standard' method of diagnosis. In other words, the lack of a rapid, accurate diagnostic test, as well as the uncertainty of the initial etiologic diagnosis and the risk stratification, results in empirical antibiotic treatments. There are significant changes in the aetiology of patients with ventilator associated lower respiratory tract infections (VA-LRTI), which are characterised by a higher incidence of multi drug resistant organisms. Evidence suggests that when patients with VA-LRTI develop organ failure, the associated mortality can be exceptionally high with frequent complications, including acute respiratory distress syndrome, acute kidney injury, and septic shock. Appropriate antibiotic treatments must consider that the present cardiovascular failure seen in patients has a different association with the patient's mortality. Unlike patients with less severe clinical presentations, who have a higher chance of survival when the appropriate antibiotics are administered promptly, for patients with a severe subtype of the disease, the appropriateness of antibiotic treatment will impact the patient's outcome to a lesser extent. The present review highlights certain factors detectable at the time of admission that could indicate patients who are at a high risk of bacteraemia and who, therefore, merit more intense therapy and stratified care.
Insights
Pneumonia diagnosis is challenging due to antibiotic resistance and lack of rapid tests. Identifying high-risk patients early can improve outcomes for severe ventilator-associated lower respiratory tract infections (VA-LRTI).
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Pulmonology
Background:
- Pneumonia, including ventilator-associated pneumonia (VAP), is a leading cause of severe infection globally, straining healthcare systems.
- Clinical diagnosis of pneumonia is often difficult due to antibiotic resistance and the absence of a definitive diagnostic standard.
- Lack of rapid, accurate diagnostic tests leads to empirical antibiotic use, particularly for ventilator-associated lower respiratory tract infections (VA-LRTI), which often involve multi-drug resistant organisms.
Purpose of the Study:
- To review factors at admission that predict high risk of bacteremia in pneumonia patients.
- To emphasize the need for stratified care and intense therapy for high-risk individuals.
- To discuss the impact of antibiotic treatment appropriateness on patient outcomes, considering disease severity and comorbidities.
Main Methods:
- This is a review article, synthesizing existing evidence on pneumonia diagnosis and treatment.
- It focuses on identifying clinical factors indicative of poor prognosis and high-risk bacteremia.
- The review examines the challenges in diagnosing VA-LRTI and the implications of antibiotic resistance.
Main Results:
- Ventilator-associated lower respiratory tract infections (VA-LRTI) in patients with organ failure have high mortality, with complications like ARDS, AKI, and septic shock.
- Cardiovascular failure influences mortality differently based on disease severity.
- Prompt, appropriate antibiotic administration improves survival in less severe cases, but has a lesser impact on severe disease subtypes.
Conclusions:
- Early identification of patients at high risk for bacteremia is crucial for effective management.
- Stratified care and intense therapy are warranted for high-risk pneumonia patients.
- Further research into rapid diagnostics and tailored antibiotic strategies is needed to combat antibiotic resistance and improve patient outcomes.
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