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  • Title: Predictors of arterial oxygen tension in anesthetized horses: 1,610 cases (1992-1994).
    Author: Whitehair KJ, Willits NH.
    Journal: J Am Vet Med Assoc; 1999 Oct 01; 215(7):978-81. PubMed ID: 10511864.
    Abstract:
    OBJECTIVE: To identify factors associated with various arterial partial pressures of oxygen (Pao2) in anesthetized horses. DESIGN: Retrospective study. ANIMALS: 1,450 horses anesthetized a total of 1,610 times with isoflurane or halothane. PROCEDURE: Anesthesia records, particularly results of blood gas analyses, were reviewed, and horses were grouped on the basis of lowest Pao2. RESULTS: For horses with lowest Pao2 < 120 mm Hg, those with low pulse pressure, that underwent anesthesia on an emergency basis, or that were males were more likely to have Pao2 < 80 mm Hg. For horses with lowest Pao2 < 250 mm Hg, those that were positioned in dorsal recumbency, that underwent anesthesia on an emergency basis, or that had a shorter duration of anesthesia were more likely to have lowest Pao2 < 120 mm Hg. For horses with lowest Pao2 < 400 mm Hg, those that were positioned in dorsal recumbency, that underwent anesthesia on an emergency basis, that had a shorter duration of anesthesia, that were older, that were heavier, or that were being ventilated mechanically were more likely to have lowest Pao2 < 250 mm Hg. CONCLUSIONS AND CLINICAL RELEVANCE: Low pulse pressure, emergency case status, dorsal recumbency, and short duration of anesthesia were significantly related with lower Pao2 in anesthetized horses.
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