Effects of butorphanol tartrate on arterial pressure, jejunal blood flow, vascular resistance, O2 extraction, and O2 uptake in halothane-anesthetized ponies.

The research explores how butorphanol tartrate impacts certain cardiovascular and metabolic functions in ponies under halothane anesthesia. Findings indicate butorphanol tartrate, while lowering blood pressure and intestinal blood flow, does not impact intestinal health adversely or affect metabolism, making it a viable pain relief choice for equine abdominal surgeries.

Objective of the Research

• The purpose of this study was to ascertain the effects of butorphanol tartrate on several physiological conditions in ponies anesthetized with halothane. The target variables included arterial pressure, blood flow in the jejunum (a part of the intestine), vascular resistance, oxygen extraction, and oxygen uptake.

Methodology and Execution

• The experiment involved 10 ponies which were put under anesthesia using a mix of halothane and 100% oxygen. The horse’s jejunum was also isolated and autoperfused for precise measurement.
• The tested drug, butorphanol tartrate, and a physiological saline solution were administered as a single shot into the left jugular vein.

Results and Findings

• Two minutes post administration, butorphanol was observed to reduce arterial blood pressure and intestinal blood flow while increasing intestinal oxygen extraction.
• However, the drug didn’t affect intestinal vascular resistance or oxygen uptake.

Conclusion of the Research

• These results led researchers to infer that while butorphanol tartrate induces hypotension, reducing intestinal blood flow, it does not adversely impact intestinal vascular resistance or metabolism.
• Thus, it was concluded that butorphanol tartrate does not undermine the intestinal health in ponies under halothane anesthesia. This makes it a potential choice for analgesic in equines undergoing abdominal surgeries.