Alveolar lavage in dogs.

Area of Science:

• Veterinary Medicine
• Pulmonary Medicine
• Canine Research

Background:

• Alveolar lavage is a diagnostic technique for assessing the lower respiratory tract.
• Understanding the cellular and microbial profile of bronchoalveolar lavage (BAL) fluid in healthy dogs is crucial for interpreting disease states.

Purpose of the Study:

• To characterize the cellular composition and microbial flora of bronchoalveolar lavage fluid in healthy canine subjects.
• To establish baseline data for canine pulmonary research.

Main Methods:

• Bronchoalveolar lavage (BAL) was performed on 10 healthy dogs via fiberoptic bronchoscopy.
• Recovered lavage fluid was analyzed for total and differential cell counts.
• Bacterial cultures were conducted on the recovered fluid.

Main Results:

• Average recovery of instilled saline was 79% (140 ml).
• Mean total cell count was 6.4 x 10^6 cells/dog, predominantly macrophages (50.5%) and lymphocytes (46.0%), with few neutrophils (3.5%).
• Bacterial cultures were negative in 80% of dogs; Bordetella bronchiseptica and Klebsiella pneumoniae were each isolated once.

Conclusions:

• Healthy dogs exhibit a distinct bronchoalveolar lavage fluid cellular profile, rich in macrophages and lymphocytes.
• The lower respiratory tract of healthy dogs is generally sterile, with rare isolation of specific bacteria.