question: Hello doctor, In mid-February 2011, had pacemaker/defibrillator placement for low EF @ 35% and irregular beats. For about two weeks I have had intermittent heart pain and pain on my left side at the level of the heart/breast. These pains do not occur at the same time. Could it be the device is lightly shocking? The pains almost feel like spasming. Heart rate and pulse are a.o.k. I am 57 year old female, 5 7 and weigh 175