Document Detail

Effect of head and neck position on intrathoracic pressure and arterial blood gas values in Dutch Warmblood riding horses during moderate exercise.
MedLine Citation:
PMID:  22452499     Owner:  NLM     Status:  In-Data-Review    
Objective-To evaluate the effect of various head and neck positions on intrathoracic pressure and arterial oxygenation during exercise in horses. Animals-7 healthy Dutch Warmblood riding horses. Procedures-The horses were evaluated with the head and neck in the following predefined positions: position 1, free and unrestrained; position 2, neck raised with the bridge of the nose aligned vertically; position 4, neck lowered and extremely flexed with the nose pointing toward the pectoral muscles; position 5, neck raised and extended with the bridge of the nose in front of a vertical line perpendicular to the ground surface; and position 7, neck lowered and flexed with the nose pointing towards the carpus. The standard exercise protocol consisted of trotting for 10 minutes, cantering for 4 minutes, trotting again for 5 minutes, and walking for 5 minutes. An esophageal balloon catheter was used to indirectly measure intrathoracic pressure. Arterial blood samples were obtained for measurement of Pao(2), Paco(2), and arterial oxygen saturation. Results-Compared with when horses were in the unrestrained position, inspiratory intrathoracic pressure became more negative during the first trot (all positions), canter and second trot (position 4), and walk (positions 4 and 5). Compared with when horses were in position 1, intrathoracic pressure difference increased in positions 4, 2, 7, and 5; Pao(2) increased in position 5; and arterial oxygen saturation increased in positions 4 and 7. Conclusions and Clinical Relevance-Position 4 was particularly influential on intrathoracic pressure during exercise in horses. The effects detected may have been caused by a dynamic upper airway obstruction and may be more profound in horses with upper airway disease.
Janneke Sleutjens; Esmee Smiet; René van Weeren; Johannes van der Kolk; Willem Back; Inge D Wijnberg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of veterinary research     Volume:  73     ISSN:  1943-5681     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-03-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  522-8     Citation Subset:  IM    
Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, NL-3584 CM, The Netherlands.
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