High frequency jet ventilation in horses: an experimental study

Equine Veterinary Journal
C I DunlopA C Jackson

Abstract

High frequency jet ventilation (HFJV) is a recently developed mode of ventilation that delivers small tidal volumes at frequencies greater than 60 cycles per min via an injection catheter to the animal's airway. The construction of a high frequency jet ventilator suitable for use in adult horses is described. The effectiveness of this ventilator in maintaining normal arterial blood-gas tension was evaluated in five healthy adult horses. The horses were anaesthetised with intravenous acetylpromazine, guaifenesin, and thiamylal, positioned in lateral recumbency and baseline measurements were made during spontaneous ventilation. The horses were then paralysed with succinylcholine and ventilated for at least 20 mins with HFJV. Air was delivered from the ventilator to the animal by a polyethylene tube. The tip of this tube remained within and approximately 30 cm from the cuffed end of a standard 30 mm internal diameter large animal orotracheal tube. Frequency of flow interruption was 3 Hz with a constant source pressure of 275 kPa and an inspiratory to expiratory ratio of approximately 1:2.6. Gas delivery to the horse, as estimated with a resonator system was approximately 2 litres/breath. During HFJV, arterial carbon dioxide tensio...Continue Reading

References

Aug 1, 1975·British Journal of Anaesthesia·L W Hall, C M Trim
Jan 1, 1987·Veterinary Research Communications·C A Blaze, N E Robinson
Aug 1, 1968·British Journal of Anaesthesia·L W HallW S Tyler
Sep 1, 1984·Critical Care Medicine·J P OphovenS J Boros
Jan 1, 1981·Critical Care Medicine·G C CarlonA D Turnbull

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