Hi Dr. I ve been diagnosed with sinus tachycardia but I feel more they are PACs, I get sometime accelerated beats but most of time I have PACs, they can reach 120 blows daily and I m 32 breastfeeding mom, I m taking indral 30mg daily but I can t feel a huge difference, my question is if the echo diagram is benign , can those PACs develop to AF? And is Concor safe for breastfeeding as indral?