sinus arrhythmia is perfectly normal.
Dang I wish they would stop noting that on ECGs. In fact, it's much more worrisome when sinus arrhythmia ISN'T present, but I digress....:-)
What type of SVT do you have? If the episodes are sinus tachycardia, perhaps you are getting scared when you feel a palpitation of some sort and driving the rate up that way? It's not uncommon for someone your age to drive the rate up towards 180 or so by getting panicky, and this can happen really fast.
I'm going to give my doctor a call tomorrow and ask her these questions, I'm not definite on what type of SVT I have.
Is an enlarged left ventricle something to be worried about?
Okay....an enlarged left ventricle that is caused by stress???? I have LVH, have a daughter that had severe left and right (concentric) hypertrophy that was killing her before her transplant,and having worked in the field of cardiology........I've NEVER, EVER heard that LVH can be caused by stress!!! And I studied A LOT about the different Cardiomyopathies, especially about HCM! Stress will aggreivate arrhythmias in patients with cardiomyopathies and if the cardiomyopathy is serious enough, the walls of the heart, due to a lack of bloodflow, can cause arrhythmias to happen more frequently, but to say stress can cause a LVH, I just can't believe she said that to you. High Blood Pressure is the most common cause of LVH, IF there is no genetic component involved, in other words there are family members who all have the disease. In HBP, the LVH would not be classified as a primary disease, it would in a genetic setting. Go for that next opinion; you need it to understand the LVH!!
Another thought: Thickened heart walls (hypertrophy) can develop electrical tracts through the muscle and those tracts are uaually easily accessable from the normal electrical pathways of the heart. That is why you can end up with SVT. What is important to know is if the fast heart rate starts and stops on a dime, or if it speeds up and then slows down. If it starts and stops on a dime, that is caused by the electrical impulse "jumping" over to the track that shouldn't be there; when it stops on a dime, it does so because the impulse "jumping" bact to the correct pathway. It's kind of like a train leaving one track and making a loop then returning to the original track again. A heart rate that increases and decreases over a short period of time is usually caused by breathing, stress and anxiety or exercising. If there is any question of LVH in you, walk as much as you can, but don't do any strenuous exercises until you have been fully cleared for that.
Okay she said it was reentrent SVT but she won't know for sure until the results come back from the other hospital which can take anywhere from 3 to 6 months :\
I asked her about the left ventricle and she said its nothing to worry about right now, she's scheduling a scan of my lungs.
She said I should be 100% fine so who do I trust?