I don't know the exact stats for the number of people with trace/trivial regurgitation of their valves, but the doctors that I have talked to find it a common finding. I have significant mitral valve regurg, but I've also had echos that show mild tricuspid and/or mild aortic regurg. Other times, only the mitral valve regurg shows up.
I was on beta blockers on/off for about 12 years (still take them as needed, but rarely) and the only thing I found that it influenced was the stress test. No matter how hard I worked, my BB kept the HR down. They said that meant the BB was doing its job. I don't think it effects the EF%.
According to the American Heart Association, a person with trivial/trace regurg would not require antibiotics. That said, I'd follow my doctors orders, regardless. I have take prophylactic antiobiotics for about 25 years and just last month my doctor said "No more antiobitics!" I was thrilled!! You can find the new guidelines at: http://www.americanheart.org/presenter.jhtml?identifier=3047051
i am not sure about antibiotics, some say yes some say no. trace regurgitation is very common, unless some problem shows up on echo to show reason for regurg. i don't think taking beta blockers would change the numbers very much on ef or the amount of regurg. if your ef is good 55-75% then you are doing well and the regurgitation is not affecting your heart function.
i had a echo and i have been on bb for 30 years , mine was fine my ef was 65. and no i didnt show any regurgitation.
side note - beta blocker used for palpitations.