Aspergillus detection in bronchoscopically acquired material. Significance and interpretation.

Area of Science:

• Medical Mycology
• Infectious Diseases
• Pulmonary Medicine

Background:

• Pulmonary invasive aspergillosis diagnosis remains difficult.
• The utility of Aspergillus cultivation and galactomannan antigen detection in bronchoscopic samples is debated.
• Accurate diagnostic methods are crucial for timely treatment of this invasive fungal infection.

Purpose of the Study:

• To evaluate the diagnostic value of Aspergillus cultivation and Aspergillus galactomannan antigen detection in bronchoscopically acquired samples.
• To compare the effectiveness of these methods in bronchoalveolar lavage (BAL) versus bronchial lavage (BL).
• To determine the positive prediction rate of these tests for invasive pulmonary aspergillosis.

Main Methods:

• Retrospective analysis of 100 bronchoscopic specimens from 69 patients between January 1996 and September 1999.
• Included patients with suspected or confirmed pulmonary aspergillosis, particularly those who were immunosuppressed.
• Assessed results from Aspergillus cultivation and Aspergillus galactomannan antigen detection (Pastorex) in BAL and BL samples.

Main Results:

• 114 positive results were obtained from 100 specimens.
• Of 69 patients, 59 were immunosuppressed, 42 had pulmonary aspergillosis, and 38 had invasive pulmonary aspergillosis.
• The overall positive prediction rate for pulmonary aspergillosis was approximately 61%.
• Aspergillus cultivation showed higher success rates in BAL samples.
• Aspergillus antigen detection was more successful in BL samples.

Conclusions:

• Both Aspergillus cultivation and galactomannan antigen detection can aid in diagnosing pulmonary aspergillosis.
• The choice of diagnostic method may depend on the type of bronchoscopic sample obtained.
• Further research is needed to optimize diagnostic strategies for invasive pulmonary aspergillosis.