Gastrointestinal effects of general anaesthesia in horses undergoing non abdominal surgery: focus on the clinical parameters and ultrasonographic images.

This research study evaluated the impact of general anaesthesia on ultrasonographic images of the gastrointestinal tract in horses undergoing non-abdominal surgery. The study found that while the size and visibility of small intestine parts were slightly increased shortly after anaesthesia, these changes were minor, temporary, and did not correlate with negative clinical signs such as colic or reduced faecal output.

Objective and Methodology

• The primary objective of this study was to assess how general anesthesia influences ultrasonographic images of a horse’s gastrointestinal tract.
• The researchers focused on non-abdominal surgeries to minimize any additional influences on the gastrointestinal tract that could arise from the surgical procedure itself.
• Twenty horses were evaluated before and four times within a 24-hour period after they received general anesthesia.
• Ultrasonographic examinations were performed to specifically target the stomach, the duodenum (the first part of the small intestine), and five areas of the jejunum (the middle part of the small intestine).
• Clinical evaluations were also conducted, which involved four-quadrant auscultation – a method of listening to sounds within regions of the body – and monitoring the horses’ output of faeces.

Results and Implications

• None of the horses exhibited any signs of colic or decreased faecal output after receiving general anesthesia, which indicates that the anesthesia didn’t cause adverse gastrointestinal effects.
• The post-anaesthetic evaluations revealed that gut sounds were significantly decreased initially but this effect lessened over time.
• While the diameter and visibility of the jejunum increased slightly following anesthesia, most of these changes remained within the normal range, indicating that the impact of anesthesia on the small intestine’s appearance in ultrasonographic images was mild and temporary.
• The study concluded that the effects of general anesthesia on ultrasonographic visuals of the small intestine can be differentiated from changes caused by a pathological process. This finding is of significance to veterinary practitioners, as it helps prevent misinterpretation of ultrasonographic images in horses that have recently undergone general anaesthesia.