Hello, sorry to have to start a new thread. Since ive read about some people and sources that lidocaine could cause heart problem. (Or other numbing agent without epinephrine) especially for people who have heart issue. A few of it: Second link people posted heart issue from dental injection. The title says iv caused the OP ask if it will be worse. http://allnurses.com/emergency-nursing/lidocaine-iv-causing-834570.html http://www.medhelp.org/posts/Heart-...V-dangers-with-heart-arrhythmias/show/1854652 Some doctor also said it would be possible for the anesthesia to get into blood srream/injected into. There's also a duscussion about lidocaine as a sodium channel blocker and could also effect histamine. Id like to ask/collect information about people with heart issue (Mainly who got from tachycardia palpitation. ) who have got lidocaine injection (Or other numbing agent without epinephrine. I dont know if its any different?) Hows your experience with it or if you know someone who has had it. Please do share. Thank you in advanced. And good day.