High frequency jet ventilation in horses: an experimental study.
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 tension was significantly reduced and arterial oxygen tension significantly increased above measurements made when the horses were spontaneously breathing air.
Publication Date: 1989-09-01 PubMed ID: 2506008DOI: 10.1111/j.2042-3306.1989.tb02684.xGoogle Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
- Research Support
- U.S. Gov't
- P.H.S.
Summary
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The research paper is about an experiment on the use of High Frequency Jet Ventilation (HFJV) in adult horses, which proved effective in maintaining normal arterial blood-gas tension.
Construction and Function of High Frequency Jet Ventilator
- The study discusses a newly constructed high frequency jet ventilator suitable for use in adult horses. It delivers small tidal volumes at a high frequency, which is more than 60 cycles per minute. The delivery is achieved via an injection cathetor to the horse’s airway.
- This ventilation system uses a polyethylene tube to deliver air from the ventilator to the horse. The tube remained around 30 cm away from the cuffed end of a standard 30mm internal diameter large animal orotracheal tube, situated within the horse.
- The frequency of flow interruption was maintained at 3 Hz with an inspiratory to expiratory ratio of approximately 1:2.6 and a constant source pressure of 275kPa. The estimated gas delivered to the horse was around 2 litres/breath.
Experimental Procedure and Findings
- The researchers tested this ventilation technique on five healthy adult horses. They were first anaesthetised with intravenous acetylpromazine, guaifenesin, and thiamylal, and then positioned on their sides.
- Initial baseline measurements were taken during the horses’ spontaneous ventilation. Subsequently, the horses were paralysed with succinylcholine and ventilated for at least 20 minutes using the High Frequency Jet Ventilation technique.
- The results of the research indicated significant improvements in the arterial blood-gas tensions of the horses. Compared to measurements taken when the horses were spontaneously breathing, there was a remarkable decrease in the arterial carbon dioxide tension and a significant increase in the arterial oxygen tension during and after High Frequency Jet Ventilation.
Implication of the Study
- The study shows that HFJV could be an effective mode of ventilation for horses during certain medical procedures. It efficiently maintains normal arterial blood-gas tensions, vital for the health of the animal.
Cite This Article
APA
Dunlop CI, Hodgson DS, Watson JW, Gillespie JR, Steffey EP, Jackson AC.
(1989).
High frequency jet ventilation in horses: an experimental study.
Equine Vet J, 21(5), 342-346.
https://doi.org/10.1111/j.2042-3306.1989.tb02684.x Publication
Researcher Affiliations
- Critical Patient Care Service, Veterinary Medical Teaching Hospital, Davis, California.
MeSH Terms
- Animals
- Blood Gas Analysis / veterinary
- Blood Pressure
- Carbon Dioxide / blood
- Heart Rate
- High-Frequency Jet Ventilation / veterinary
- Horses / blood
- Horses / physiology
- Male
- Oxygen / blood
- Tidal Volume / veterinary
Grant Funding
- HL 26606 / NHLBI NIH HHS
- NHL 32331 / NHLBI NIH HHS
Citations
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