It sounds like she's already had tests that would rule out mitral valve prolapse. The possibility would've shown up in the EKG, ultrasound and 24 hour heart monitor. The ultrasound actually sees how the heart is shaped. I've been diagnosed with heart arrythmia and the diagnosis started with the EKG. I've also had the ultrasound and 24 hour heart monitor. Prolapsed mitral valve was ruled out way early.
I have a heart murmur and had rheumatic fever as a child which can be indicative of the possibility of a prolapsed mitral valve. I don't have one. The symptoms you've found are also symptoms of other difficulties. It takes the right combination of symptoms and verification thru testing to diagnose prolapsed mitral valve.
My mother had a prolapsed mitral valve. The final and essential test to determine it's existence is .......Can't think of its name but it involves threading a catheter thru a vein in the wrist or groin up to the heart under twilight sedation. However, before doing this test there will be other signs that do or do not show up during testing.
Yes, ask about that possibility but be willing to accept the doctor's reasons for ruling it out. I would not decide what needs to be done before talking with her doctor. You need much more info before you'll know what to do. Please try to trust the medical profession to do the right tests.
I know you're anxious to find out and treat the cause of your daughter's symptoms. However, I suggest searching on the Internet will cause you more stress without helping you to deal with this situation.
I was only referred to a cardiologist because my EKG showed some irregularities. Tho, your daughter has some symptoms of heart and lung difficulties if her EKG was normal and the ultrasound was normal I suggest that it's likely not her heart causing them. Talk with the doctor about this so that you can better understand the reasons for ruling out heart and lung problems. If you want a second opinion ask your doctor which specialist would be the best to get more information. He knows what he's done and how his tests have ruled out certain things. He can steer you in a productive direction.