I didn't get through all eleven pages so forgive me if I'm repeating.
But if you think all us vets have for cardiac evaluation is a stethoscope, you are sorely mistaken. At the academic hospital were I am completing my veterinary degree, we have far more sophisticated technology.
We routinely do heart ECG in both relaxed and exercising horses which reveals a variety of conditions such as atrial fibrillation, mumours, heart chamber enlargements and even metabolic imbalances. We do ECGs on every horse before surgery as well as when horses come in for cardiac complaints so you can be pretty sure that it would be a standard test for a check-up of a super-athlete. It is not that expensive to do and is incredibly simple to do, you just need the knowledge to interpret the results.
We run ultrasounds of the heart to evaluate chamber size and contraction in multiple modes. We do doppler ultrasound to look for any abnormalities in cardiac blood flow. While we are certainly far behind the medical world when it comes to technology, we are not as outdated as you assume.
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