supraventricular tachycardia
"This drug was given to me when I was totally unaware of what was going on. I was transported 60 miles to nearest heart center. Given to me a second time in 12 hours. I was aware and let me tell you it was painful in my chest and then I got an intense headache. The doctor tried to get me to take the drug a third time about 24 hours later, and I said no! I ended up putting my head into a bucket of ice water to get my heart rate back down to normal.  There are ways to do things with out chemicals! over and over again!"