I have a 3-year-old Holsteiner mare, bought at auction, that I had vetted yesterday as if it were a routine PPE. Her results were excellent in all but one category. Her resting heartbeat was completely normal, but after strenuous exercise became irregular.
The research I’ve done suggests that this is a very rare situation, so rare that I would like to repeat the test in a couple of weeks. And for another reason too.
Four days before the vetting my partner trailered the mare out to have her teeth done for the first time That process was mismanaged in my opinion–the mare became so frightened that the dentist administered four times the ordinary dose of sedative to get the job done.
Any thoughts on the possibility that lingering sedative in her system could account for the irregular heartbeat after excercise four days later?