Gepost in: Infecties
Ventilator-associated pneumonia in the ICU
Ventilator-associated pneumonia (VAP) is defi ned as pneumonia that occurs 48–72 hours or thereafter following endotracheal intubation, characterized by the presence of a new or progressive infi ltrate, signs of systemic infection (fever, altered white blood cell count), changes in sputum characteristics, and detection of a causative agent . VAP contributes to approximately half of all cases of hospital-acquired pneumonia , . VAP is estimated to occur in 9–27 % of all mechanically ventilated patients, with the highest risk being early in the course of hospitalization , . It is the second most common nosocomial infection in the intensive care unit (ICU) and the most common in mechanically ventilated patients , . VAP rates range from 1.2 to 8.5 per 1,000 ventilator days and are reliant on the defi nition used for diagnosis . Risk for VAP is greatest during the fi rst 5 days of mechanical ventilation (3 %) with the mean duration between intubation and development of VAP being 3.3 days , . Th is risk declines to 2 %/day between days 5 to 10 of ventilation, and 1 %/day thereafter , . Earlier studies placed the attributable mortality for VAP at between 33–50 %, but this rate is variable and relies heavily on the underlying medical illness . Over the years, the attributable risk of death has decreased and is more recently estimated at 9–13 % , , largely because of implementation of preventive strategies. Approximately 50 % of all antibiotics administered in ICUs are for treatment of VAP , . Early onset VAP is defi ned as pneumonia that occurs within 4 days and this is usually attributed to antibiotic sensitive pathogens whereas late onset VAP is more likely caused by multidrug resistant (MDR) bacteria and emerges after 4 days of intubation , . Th us, VAP poses grave implications in endotracheally intubated adult patients in ICUs worldwide and leads to increased adverse outcomes and healthcare costs. Independent risk factors for develop ment of VAP are male sex, admission for trauma and intermediate underlying disease severity, with odds ratios (OR) of 1.58, 1.75 and 1.47–1.70, respectively .
Atul Ashok Kalanuria, Wendy Zai, Marek Mirski
Kalanuria et al. Critical Care 2014, 18:208 http://ccforum.com/content/18/2/208