Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2848556 | Respiratory Physiology & Neurobiology | 2007 | 6 Pages |
Abstract
Forced expiratory flow-volume curves were performed in 15 cats using the non-invasive thoracic compression techniques developed for use in human infants. Cats breathed through a face mask and pneumotachygraph from which flow and volume were obtained. Thoracic compression was applied from an inflatable bag in a non-expandable jacket surrounding the animal. Bag inflation at end inspiration was initiated by a computer pulse to a pressurized chamber. Processed signals from the pneumotachygraph determined maximum-forced expiratory flow at lung volume equivalent to functional residual capacity (FRC), termed Vâ²maxFRC. Different compression pressures were used, and the highest value from a technically satisfactory flow-volume loop was taken as the result. Mean (±95% CI) Vâ²maxFRC was 422 (369-475) ml/s. Compared with infants of similar weight (Vâ²maxFRC approximately 180 ml/s), cats had a much higher Vâ²maxFRC. Tests repeated another day showed a mean (±95% CI) percentage difference between paired tests to be 2.8 (â12.6, +18.3)%. Non-invasive forced expiratory flow-volume measurements can be reliably obtained in sedated cats.
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Authors
Hylton Bark, Ana Epstein, Ephraim Bar-Yishay, Alex Putilov, Simon Godfrey,