Recording of intratracheal pressure in the horse under field conditions as a method for evaluation of upper airway resistance.

The research explored the effectiveness of recording intratracheal pressure in horses under field conditions as a method to evaluate upper airway obstruction. This method, previously performed on a treadmill, was tested outdoors to assess its viability for examining respiratory issues that mostly occur during a race.

Methodology

• The team carried out the study on normal horses performing a standardized exercise test outdoors.
• Throughout this test, the horses’ intratracheal pressure was recorded using transducer-linked tape recorder to a percutaneously inserted intratracheal catheter.
• The exercise tests were conducted under three distinct conditions: with a sulky or rider outdoors, and on a treadmill indoors.

Comparison & Analysis

• The indoor treadmill test was included to contrast results between field exercise and treadmill exercise.
• Various respiratory variables calculated from the recordings offer insight into reactions of the horses to the three different tests.
• Data showed that the pressure graphs generally resembled those acquired from previous treadmill tests, indicating the method’s applicability in diverse settings.

Results & Conclusions

• Notable differences were observed in the reactions of the horses to the three tests, implying the need for a control group studied under similar conditions.
• The technique used was deemed simple and cost-effective, especially for outdoor tests, enhancing its potential adoption in routine clinical studies of upper airway obstructions.
• The practicality of outdoor testing also allows research into respiratory disorders that predominantly occur under racing conditions.

These findings demonstrate that tracking intratracheal pressure outdoors could be a practical way of evaluating upper airway obstruction in horses, and could prove especially useful for investigations into respiratory problems stemming from racing conditions.