Your echo looks normal in every respect. You are being referred due to your symptoms.
Your symptoms imply that you are getting inadequate oxygen
and/or blood supply to possibly your heart muscle (suddenly rapid heart rate
) and more certainly your brain (having visual changes) with activity. What would do that? A couple things come mind:
1. You may have a left-to-right shunt (opening between the septum of the left side of your heart and the right side of your heart) that allows de-oxygenated blood to mix with your oxygenated blood. This would be happening all of the time but only becomes an issue for you during times of exertion. It is a congenital condition. If found then it would be evaluated for how serious the problem is - usually by a bubble study or a trans-esophogeal echocardiogram
(aka TEE) or both. Large defects, if present, can be corrected surgically.
2. Abnormal rhythm. The top or bottom of your heart may sudden go into a very fast rhythm that is not efficient at pumping blood (too fast to even fill with blood to pump it), therefore causing the brain to feel like it is being starved for oxygen.
Your PCP was looking for a valvular dysfunction
which could cause the same problem - but it is not there. A cardiologist may run a variety of tests first to establish the cause and then to consider the best approach to fix it.
Having said all of that it is entirely possible nothing is wrong with your heart and there is another issue at play. Good luck.