Adenosine
"Heart rate was 240 I arrived at the ER within 5 minutes because I live 2 blocks from the hospital and yes I know but I drove myself. Second dose of adenosine lowered heart rate to 110 then it returned to normal within 2 hours. Didn't like the effects as it was given but I feel it saved my life. Felt burning from head to toe, head pressure and felt like a wave like panic attacks."