A low BP is often accompanied, in my understanding, by shortness of breath and dizziness upon exertion. If you doctor didn't mention anything about you BP it seems a problem was not seen. Still, in my understanding, low blood pressure, like being skinny goes with the mind-set that there is no such thing. In the absence of problem symptoms, low BP is good.
Sorry if I missed, I take it these symptom complaints are new, that is you didn't experience them in your first 18+ years of life. If that is the case, then there must be a change in something. Think about your diet, including drinking and other "life-style" issues to see if you can recall any changes that took place before the onset of symptoms.
Hello, thanks for replying. I did fix the gender as you said.
As for the details, I generally have a resting heart rate of 90 BPM, weigh about 154 pounds, and exercise at least 30 minutes a day. I can't say what my blood pressure is off the top of my head. We found out the size of my heart in a CT scan. My circulation isn't all that well, either, and my always-cold hands and feet prove that. Because I didn't have high blood pressure or other symptoms of a higher heart rate, he came to the conclusion that I had a smaller heart. When I felt the rush, I believe my HR went up to at least 150-60. Sorry about the lack of information. I should've thought about being more detailed.
First I see your profile list you as female, you may want to correct that.
This is something you should discuss further with your doctor. Then if the sudden high heart rated doesn't repeat it isn't likely that the doctor will find anything.
You didn't mention any numbers, not even base-line other than you have a "smaller than normal" heart size. How was that figured out, did you doctor do an echocardiogram? I'm not a doctor, but it would be news to me if a doctor can tell the size, even relative size, of a person's heart with stethoscope or even an EKG.
I will also speculate that a even "smaller than normal" heart would not cause dizziness, forget passing out, from the simple exertion of standing up.
What is your blood pressure, what is your resting HR, about how high was the HR rush... what is your general physical condition: weight, exercise - even what had you been eating and drinking before you had a HR rush?
I just list some thoughts, the limited information you provided does not facilitate a reader to decide if they have any experience with your issue.
Good luck, and if you symptom continues please get it checked by a doctor.