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  • Title: Comparison of transtracheal aspirate and bronchoalveolar lavage cytology in 50 horses with chronic lung disease.
    Author: Derksen FJ, Brown CM, Sonea I, Darien BJ, Robinson NE.
    Journal: Equine Vet J; 1989 Jan; 21(1):23-6. PubMed ID: 2920696.
    Abstract:
    Comparisons were made between transtracheal aspirate (TTA) and bronchoalveolar lavage (BAL) cytology obtained from 50 horses with chronic lung disease and from 10 control horses. There was no significant correlation between the TTA cytology and the BAL cytology, suggesting that the cell population in the trachea is not representative of the cell population in the lower airways. In control horses the range of differential cell counts obtained from TTA fluid was remarkably large, whereas the variability in cell populations observed in BAL fluid was smaller. In the principal horses the total and differential cell counts of the TTA and BAL fluids were within the 95 per cent confidence interval in 38 and 24 per cent of cases, respectively; and an increase in percentage neutrophils was most common. It was concluded that BAL may be a useful diagnostic aid when evaluating horses with chronic lung disease, but that the clinical usefulness of cytological evaluations of TTA fluid may be limited in these cases.
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