In vivo evaluation of effects of sedation on results of acoustoelastography of the superficial digital flexor tendons in clinically normal horses.

This research aims to understand how sedation affects the results of acoustoelastography, a diagnostic ultrasound technique, on superficial digital flexor tendons in horses. The study found that sedation, specifically with detomidine and butorphanol, lowered the pathology index (PI), a measure of the level of disease or damage in tissues, but also lead to more favourable conditions for performing acoustoelastography.

Research Procedures

• Conducted on 27 clinically normal horses, the researchers used acoustoelastography to measure the PI of the superficial digital flexor tendon (SDFT) in each thoracic limb.
• The pathologic parameters were assessed at 4 different points, located at varying distances away from a specific point in the limb (accessory carpal bone).
• Each horse was evaluated before and after being sedated with a mix of detomidine hydrochloride and butorphanol tartrate, both popular sedatives used in veterinary practice.
• In their investigation, the researchers used a statistical technique called repeated-measures analysis of variance for their analysis.

Results of the Study

• The researchers observed that the PI was generally lower post sedation than prior to sedation.
• Additionally, they noted that the PI measured at points more distal (farther away from the centre of the body) to the accessory carpal bone was lower than at locations that are more proximal (closer to the centre of the body).
• A key finding was that the effect of sedation, and consequently the PI, did not significantly differ between the left and right thoracic limbs of the horses.
• The study also revealed variation between individual horses, with a large proportion of the variance associated with individual horses themselves.

Conclusions and Relevance

• The researchers concluded that while sedation with detomidine and butorphanol did make it easier to perform acoustoelastography, it also decreased the SDFT PI in the clinically healthy horses used for the study.
• They also noted that sedation should be consistently used in such studies as it seems to influence the results of the PI, influencing the level of perceived damage or disease in the tendon tissue.
• The researchers highlight the importance of taking into account individual variances while interpreting results as it had the greatest influence on the outcome of the PI.