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The changes during surgery tend to be related to position.  Horses are not very good at regulating circulation (and BP) when lying down, but when they are not under anesthesia, they will sense the changes and will get back up.   Obviously they can't do this during surgery!

 

Unfortunately this is of little help in endurance horses, as they do tend to compete in an upright position....

 

Heidi

One of my mares recently had to have surgery involving a general anesthetic, which due to her age of 20, the vet gave as gas. She had a needle inserted into a major vein in her temple in order to monitor her blood pressure. I asked about this and was told that the blood pressure can be a very tricky issue during surgery because it can suddenly crash and any other measure than a direct one would not register this.  Granted that this is watching for a drop, but if peripheral measures don't show the changes properly when going down, it seems to me that they might be a problem for rising changes as well.

Maryanne

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