i have had psvt for 5 years now, but i just got diagnosed with it last week. my heart rate went up to 245bpm and i had to have 6mg of adenosine to make it stop. it used to only last for 30 seconds to a minute, but now it just doesnt stop. i had it happen again today and i was able to stop it on my own by pushing my stomach muscles down (thankgod). adenosine was a terrible experience and i wish to never have it again. anyways im only 18 and i was wondering if this is just going to worsen with time? and why did it happen twice in two weeks when it normally happens once every 6-12 months? it scares me a lot and i just want it gone :(