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Airway sampling and introduction to bronchoscopy

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Abstract

Airway sampling is a very important component of the diagnostic work up of respiratory cases, and in many instances it is the method that will give a definitive diagnosis since the results of such tests will reflect lung and airway pathology. Until routine lung biopsy is adopted in companion animal medicine, airway sampling will remain one of the most important diagnostic tests in respiratory medicine. The main use of airway sampling is to obtain samples for cytological analysis. In addition, airway sampling can allow identification of significant bacterial infections and can identify respiratory parasites. However, culture might not always be successful and the veterinary surgeon has to be wary of false-negative results or erroneous positive results (i.e. culturing organisms that are of no concern). The chapter looks at Tracheal wash and bronchoalveolar lavage; Bronchoscopy; and Cytology and culture.

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Figures

Image of 10.1
10.1 Bronchoscopic image of the carina in a cat. The opening to the left mainstem bronchus (LMB) and right mainstem bronchus (RMB) are valuable landmarks for performing bronchoscopy. (Courtesy of L. Johnson.)
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10.2 BAL sample illustrating non-specific inflammatory reaction. This sample was collected from a dog with chronic bronchitis and shows a mixed inflammatory profile dominated by neutrophils and macrophages.
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10.3 BAL sample illustrating a mixed inflammatory reaction associated with bacterial infection. This sample was collected from a dog with lobar bronchopneumonia and shows a mixed inflammatory profile with extra- and intracellular bacteria.
Image of 10.4
10.4 BAL sample illustrating an inflammatory reaction with increased numbers of eosinophils surrounding an airway parasite (). (Courtesy of E. Milne.)

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