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A comparison of bronchoscopic vs blind protected specimen brush sampling in patients with suspected
Background:
Pneumonia is a common complication in patients undergoing mechanical ventilation and increases ICU mortality. The clinical diagnosis of ventilator-associated, however, pneumonia is unreliable, and many consider bronchoscopic-directed protected specimen brush sampling and quantitative culture the diagnostic method of choice. Bronchoscopy, however, is expensive and not readily available in many ICUs.
Objective:
To test the hypothesis that "blind" protected specimen brush (PSB) sampling may produce results similar to that of bronchoscopic-directed sampling.
Setting:
The medical ICU of a university-affiliated teaching hospital.
Intervention:
Patients with suspected ventilator-associated pneumonia (VAP) who had not received antibiotics for at least 48 h underwent "blind" and bronchoscopic-directed PSB sampling with quantitative culture.
Results:
Fifty-five paired PSB specimens were obtained from 53 patients. There was an 85% quantitative agreement between the blind and bronchoscopic-directed specimens. The agreement was independent of the bronchopulmonary segment from which the bronchoscopic sampling was directed.
Conclusion:
The results of this study are consistent with the notion that blind PSB sampling and quantitative culture may prove to be a useful, cost-effective, and minimally invasive method of diagnosing VAP.
Insights
Blind protected specimen brush (PSB) sampling is a reliable and cost-effective method for diagnosing ventilator-associated pneumonia (VAP). This technique shows high agreement with bronchoscopic sampling, offering a valuable alternative for VAP diagnosis.
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Pulmonary Medicine
Background:
- Ventilator-associated pneumonia (VAP) is a frequent complication in mechanically ventilated patients, contributing to increased ICU mortality.
- Clinical diagnosis of VAP is often unreliable.
- Bronchoscopic-directed protected specimen brush (PSB) sampling with quantitative culture is considered the gold standard but is costly and not widely accessible.
Purpose of the Study:
- To evaluate the diagnostic accuracy of "blind" PSB sampling compared to bronchoscopic-directed PSB sampling for VAP.
- To determine if blind PSB sampling can serve as a viable alternative to bronchoscopy.
Main Methods:
- A study was conducted in a university-affiliated medical ICU.
- Patients with suspected VAP, not on antibiotics for at least 48 hours, underwent both blind and bronchoscopic-directed PSB sampling.
- Quantitative culture was used for specimen analysis.
Main Results:
- Fifty-five paired PSB specimens were analyzed from 53 patients.
- An 85% quantitative agreement was observed between blind and bronchoscopic-directed PSB samples.
- This agreement was consistent regardless of the specific bronchopulmonary segment sampled.
Conclusions:
- Blind PSB sampling with quantitative culture demonstrates high agreement with bronchoscopic-directed sampling.
- This method presents a potentially useful, cost-effective, and minimally invasive approach for diagnosing VAP.
- Blind PSB sampling may be a practical diagnostic tool in resource-limited ICU settings.