supraventricular tachycardia
"Could not control my heart rate naturally after going into SVT of 200 bpm. Tried bearing down, breathing techniques, but nothing worked. Had my wofe drive me into the ER where they prepped me for an IV and then gave me Adenosine. First time ever I had taken it for my SVT in the 36 years I have had it. It dropped my heart rate instantly to 130 then down to 90. I was amazed and relieved. I still prefer controling it myself but it is good to know there is something out there that works to control it when all other ways fail. I had no burning experience like others did. I do have a cottony feeling head and extreme tiredness 2 days after but that seems to come with a 1-2 hour 200bpm episode."