Effects of lipopolysaccharide and phenylbutazone on gastric contents in the horse.

The research explores the effects of lipopolysaccharide (LPS) and phenylbutazone on gastric contents in horses. The hypothesis was that LPS, a toxic element of certain bacteria, would reduce gastric acid secretion and that phenylbutazone could suppress these effects.

Objective and Methods of the Study

The objective of this study was to investigate whether LPS, a toxic component found in Gram-negative bacteria, would impact gastric acid secretion in horses, and to what extent a pretreatment with phenylbutazone could counteract these changes.

• The study was conducted on mature horses that had fasted and were equipped with permanent gastric cannulae – tubes inserted into their stomachs for medical testing.
• The horses were pretreated with either saline or phenylbutazone 15 minutes before a one-hour infusion of either LPS or saline.
• Gastric contents of the horses were collected every 15 minutes for three hours, starting 15 minutes after the LPS or saline infusion had started.

Study Results

The results showed that LPS significantly diminished the output of gastric acid, potassium levels, and potassium output. It also increased sodium levels and sodium output.

• Phenylbutazone did not affect the base level of gastric acid secretion in the horses.
• However, it was seen to reduce the changes brought about by LPS in the volume of secreted gastric contents, sodium levels, and sodium output.

Conclusions

The paper provides evidence that LPS does impact the secretion of gastric acid in horses. It also suggests that these changes by LPS are mediated, to some extent, by prostaglandins, a group of physiologically active lipid compounds with hormone-like effects.

• The researchers concluded that LPS can indeed change the composition of gastric contents in horses.
• However, the exact source of these changes requires further investigation, indicating the need for additional research in this field.