Use of multichannel electrointestinography for noninvasive assessment of myoelectrical activity in the cecum and large colon of horses.

The research focuses on the exploration of multichannel electrointestinography (EIG) in assessing changes in myoelectrical activity in the cecum and large colon of horses. The outcome suggests that EIG is beneficial in evaluating these changes, identifying the need for multiple electrodes covering a larger area of the intestines to make this analysis meaningful.

Overview of the Research Method

• The study was conducted on six healthy mature horses. Each horse underwent three EIG procedures. The focus was to record intestinal myoelectrical activity in the horse’s cecum and large colon during a 20-minute period after the intravenous administration of certain substances: physiologic saline (baseline), erythromycin lactobionate, or detomidine. Concurrently, intestinal contractions were observed using B-mode ultrasonography.

Data Analysis

• The EIG recordings were examined using computer software. During this process, the mean dominant frequency was established. This frequency represents the rhythmicity of the gastric electrical activity expressed in cycles per minute (cpm).
• The total power measured in microvolts squared (muV(2)) was then calculated. Treatment effect was derived as a power ratio, calculated by dividing the treatment-associated power by the baseline power.

Results of the Research

• Findings displayed that the dominant frequency cpm values were unstable, with no significant differences evident between the treatments.
• Specifically, detomidine significantly lowered the mean power ratios in the cecum and colon compared to the effects of saline solution treatment. On the other hand, erythromycin noticeably reduced the power ratio in the cecum and increased the ratio in the colon. However, the increase was only significant in one channel.
• Notably, a significant correlation was observed between ultrasonographic findings and total power predominantly coming from the long-distance electrode pairs.

Conclusions of the Study

• The data suggests that EIG is a useful tool for assessing changes in myoelectrical activity in the cecum and large colon of horses.
• To enhance the analysis, multiple electrodes should be used to cover a larger area of the intestine. Further, the agreement between multiple channels should be ensured to make the analysis meaningful.