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your daughter needs to be evaluated by a cardiologist.
i do not believe that blood pressure is the primary culprit here, I am more concerned that in a young and otherwise healthy woman that she is experiencing exertional syncope (fainting during exertion).
this is not something her physician should be ignoring.
here is a helpful link on fainting (syncope)....
notice that this link speaks specifically about the benign cause of fainting, but if you read about testing, you will see that specific tests including an ultrasound of the heart and cardiac monitoring are essential in ruling out dangerous causes.
I would not hesitate to ask to be referred to a cardiologist for 'exertional syncope'. this is where you should start.
please let me know if you have questions about my answer.
Hi, and thank you for your good response. My only question relates to the fact that our daughter never feels faint WHILE exercising, only as her heart rate returns to normal afterward. She also says that it never comes on unexpectedly, but always with the recognizeable sequence of "signs". Do you still consider this "exertional syncope"?
If there were heart irregularities associated with these symptoms, could you please indicate what they might be?
Again, thank you for any help you might be able to offer in helping us to understand our daughter's condition.
I think that's the place to start... in your original post you state that after excercise she has to lie down in order not to pass out.
This is not as worrisome as passing out while exercising to be sure, but it still points to a possible problem with the heart. A rhythm disturbance for instance.
A holter monitor (computer recording of her heart rhythym) would be a good place to start, and an ultrasound of the heart could find any structural abnormality such as Hypertrophic Cardiomyopathy.
I'm not suggesting she has either a rhythym disturbance OR hypertrophic cardiomyopathy, and it may well be that she has a problem with her blood pressure and the neurological pathways that maintain adequate blood pressure, but what I AM suggesting, is that this is not something to simply blame on low blood pressure and be done. Her condition requires further investigation to take the 'bad' diagnoses off the table. Since her doctor is not interested in pursuing this I would not hesitate to get a second opinion, and I think the best place to start would be with a cardiologist.
As you can see from THIS LINK, the evaluation of fainting (syncope) is quite complex as there are so many possible causes. The point is to start looking.