effects of atropine on antigen-induced bronchospasm in the horse
Clicks: 140
ID: 258577
2001
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Abstract
The efficacy of atropine to attenuate Ascaris suum induced bronchospasm was studied in 6 conscious standing horses. Animals were challenged with saline and a 10-2 dilution of A. suum aerosolized for 3 minutes. Pulmonary function tests (PFT) were performed at 15, 30 and 60 minutes after antigen challenge. Pulmonary mechanics and ventilation values were measured using a differential pressure transducer and a Fleisch Pnemotachograph. One week later, animals were treated with atropine sulfate (6.0 mg administered IM) and rechallenged with saline followed by same dose of A. suum. Clinical signs noted after the inhalation of A. suum alone included hyperpnea, dyspnea, sweating and salivation. The effect of antigen was rapid in onset starting during the inhalation and lasting for over 60 minutes. The PFT revealed significant (P<0.05) increases in Wb, max. Ppl RL, V1, f, and VT whereas the Cdyn decreased (P<0.05). The changes were more severe in lower airways. Atropine abolished the clinical signs. Comparison of post atropine saline and A. suum challenge values revealed significant increase in Wb, max. Ppl at 15 minutes post antigen challenge. Changes in RL, f and Cdyn were abolished. Comparison of responses to A. suum in the presence and absence of atropine revealed a significant (P<0.05) inhibition of changes in max. Ppl, Wb, inspiratory and expiratory RL, VI, f and flow. The study suggested that the A. suum induced bronchospasm in the horses is mediated, at least in part by vagal reflexes.
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| Reference Key |
eyre2,2001pakistaneffects
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| Authors | ;K.B. Mirbahar, R.B. Mirbahar, Nasreen Akhter, W.N. McDonell1 and P. Eyre2, |
| Journal | ecti damt-ncon 2019 - 4th international conference on digital arts, media and technology and 2nd ecti northern section conference on electrical, electronics, computer and telecommunications engineering |
| Year | 2001 |
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